AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch adds a missing of_node_put() in the error handling path of onie_tlv_add_cells() in drivers/nvmem/layouts/onie-tlv.c. This driver parses Open Compute Project ONIE TLV tables from NVMEM devices described in Open Firmware / Device Tree (OF) nodes. On the target architecture (amd64), Device Tree hardware topology is not used (systems boot via ACPI/BIOS), and standard virtualized QEMU/GCE environments lack emulation for this physical network switch hardware or OF layout. Therefore, the modified code is structurally unreachable and not worth fuzzing.",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit 09c1945401f7bb3086e8701330968bb8b2977eb3\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Sep 19 11:01:50 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/nvmem/layouts/onie-tlv.c b/drivers/nvmem/layouts/onie-tlv.c\nindex 0967a32319a28..3d77680f089b8 100644\n--- a/drivers/nvmem/layouts/onie-tlv.c\n+++ b/drivers/nvmem/layouts/onie-tlv.c\n@@ -128,6 +128,7 @@ static int onie_tlv_add_cells(struct device *dev, struct nvmem_device *nvmem,\n \n \t\tret = nvmem_add_one_cell(nvmem, \u0026cell);\n \t\tif (ret) {\n+\t\t\tof_node_put(cell.np);\n \t\t\tof_node_put(layout);\n \t\t\treturn ret;\n \t\t}\n"
}

core

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch adds a missing of_node_put() in the error handling path of onie_tlv_add_cells() in drivers/nvmem/layouts/onie-tlv.c. This driver parses Open Compute Project ONIE TLV tables from NVMEM devices described in Open Firmware / Device Tree (OF) nodes. On the target architecture (amd64), Device Tree hardware topology is not used (systems boot via ACPI/BIOS), and standard virtualized QEMU/GCE environments lack emulation for this physical network switch hardware or OF layout. Therefore, the modified code is structurally unreachable and not worth fuzzing.",
  "WorthFuzzing": false
}

You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.

================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.

- REACHABILITY IS THE PRIMARY GATE:
  Fuzzing can only discover bugs in code that can actually execute in standard virtualized
  environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
  If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
  regardless of whether it adds assertions or complex logic.

- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
  Patch authors routinely label changes as "cleanups", "refactorings", or state
  "No functional change intended". Do NOT take these claims at face value.
  Code refactorings that rearrange logic, introduce helper functions, or alter state management
  in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
  If reachable executable code is modified or refactored, it MUST be fuzzed.

- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
  When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
  BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
  Even if the author believes the invariant always holds, fuzzing is essential to verify whether
  an unusual sequence of operations can violate it.

================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:

- Non-kernel and non-executable changes:
  * Modifications to Documentation/, comments, or spelling fixes.
  * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
    that do not affect the compiled kernel image (vmlinux) or kernel modules.
  * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
    that do not alter control flow or data structures.
  * Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
  * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
    ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
  * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
    physical PCI hot-unplug or manual sysfs driver unbinding.
  * Code paths exclusive to architectures other than the target architecture.

================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
  * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
    BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
  * Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
  * Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
  * Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).

================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:

- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
  Do NOT list generic, ubiquitous functions called by almost every program in the corpus
  (including, but not limited to: general memory allocators and deallocators, page fault
  and trap handlers, or core synchronization primitives; this is not an exhaustive list).
  Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
  which severely dilutes fuzzing effort away from the actual changes.

- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
  List functions that specifically implement the logic being added or altered, or direct API entrypoints
  for the subsystem feature under review.

- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
  Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
  distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
  If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
  functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).

================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit 09c1945401f7bb3086e8701330968bb8b2977eb3
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Sep 19 11:01:50 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/nvmem/layouts/onie-tlv.c b/drivers/nvmem/layouts/onie-tlv.c
index 0967a32319a28..3d77680f089b8 100644
--- a/drivers/nvmem/layouts/onie-tlv.c
+++ b/drivers/nvmem/layouts/onie-tlv.c
@@ -128,6 +128,7 @@ static int onie_tlv_add_cells(struct device *dev, struct nvmem_device *nvmem,
 
 		ret = nvmem_add_one_cell(nvmem, &cell);
 		if (ret) {
+			of_node_put(cell.np);
 			of_node_put(layout);
 			return ret;
 		}

gemini-3.8-flash

null

null

							input: 2873
							output: 40
							thoughts: 307
						

**Analyzing the ONIE TLV NVMEM Driver Patch**

Okay, so the patch is in `drivers/nvmem/layouts/onie-tlv.c`. Let's take a quick look at the `diff` itself, and then I'll dive into the code and figure out what's going on. Ah, right. It looks like they've added an `of_node_put` call within the `if (ret)` block in `onie_tlv_add_cells`. That suggests there was a resource leak where the OF node wasn't being released on error. Good catch, but let's see if there's more to this.

Now, let's open `drivers/nvmem/layouts/onie-tlv.c` and figure out what the ONIE TLV driver is actually *doing*. I need to understand its purpose within the NVMEM framework. How is it used to interface with the hardware? How is the driver registered? Is it using platform data, device tree, or something else? I need to understand how the driver's probed and whether the layout it parses is specific to certain hardware or more generic.

Next, I need to understand the control flow. How is the driver reachable during system boot or runtime? From a security perspective, I need to know the attack surface - how is this driver *triggered*? This helps me determine if this is exploitable and how to replicate it in a fuzzing environment like syzkaller. Is it possible to trigger this driver during standard operations on QEMU/amd64? I need to understand the execution path so I can determine whether it's practically reachable or just structurally so. If so, what does that path look like? Is it behind a specific configuration option? Is there a dependency on a particular hardware platform or board? I'm going to look for any clues to answer this.

{
  "File": "drivers/nvmem/layouts/onie-tlv.c",
  "FirstLine": 1,
  "LineCount": 100
}

{
  "Contents": "   1:\t// SPDX-License-Identifier: GPL-2.0-only\n   2:\t/*\n   3:\t * ONIE tlv NVMEM cells provider\n   4:\t *\n   5:\t * Copyright (C) 2022 Open Compute Group ONIE\n   6:\t * Author: Miquel Raynal \u003cmiquel.raynal@bootlin.com\u003e\n   7:\t * Based on the nvmem driver written by: Vadym Kochan \u003cvadym.kochan@plvision.eu\u003e\n   8:\t * Inspired by the first layout written by: Rafał Miłecki \u003crafal@milecki.pl\u003e\n   9:\t */\n  10:\t\n  11:\t#include \u003clinux/crc32.h\u003e\n  12:\t#include \u003clinux/etherdevice.h\u003e\n  13:\t#include \u003clinux/nvmem-consumer.h\u003e\n  14:\t#include \u003clinux/nvmem-provider.h\u003e\n  15:\t#include \u003clinux/of.h\u003e\n  16:\t\n  17:\t#define ONIE_TLV_MAX_LEN 2048\n  18:\t#define ONIE_TLV_CRC_FIELD_SZ 6\n  19:\t#define ONIE_TLV_CRC_SZ 4\n  20:\t#define ONIE_TLV_HDR_ID\t\"TlvInfo\"\n  21:\t\n  22:\tstruct onie_tlv_hdr {\n  23:\t\tu8 id[8];\n  24:\t\tu8 version;\n  25:\t\t__be16 data_len;\n  26:\t} __packed;\n  27:\t\n  28:\tstruct onie_tlv {\n  29:\t\tu8 type;\n  30:\t\tu8 len;\n  31:\t} __packed;\n  32:\t\n  33:\tstatic const char *onie_tlv_cell_name(u8 type)\n  34:\t{\n  35:\t\tswitch (type) {\n  36:\t\tcase 0x21:\n  37:\t\t\treturn \"product-name\";\n  38:\t\tcase 0x22:\n  39:\t\t\treturn \"part-number\";\n  40:\t\tcase 0x23:\n  41:\t\t\treturn \"serial-number\";\n  42:\t\tcase 0x24:\n  43:\t\t\treturn \"mac-address\";\n  44:\t\tcase 0x25:\n  45:\t\t\treturn \"manufacture-date\";\n  46:\t\tcase 0x26:\n  47:\t\t\treturn \"device-version\";\n  48:\t\tcase 0x27:\n  49:\t\t\treturn \"label-revision\";\n  50:\t\tcase 0x28:\n  51:\t\t\treturn \"platform-name\";\n  52:\t\tcase 0x29:\n  53:\t\t\treturn \"onie-version\";\n  54:\t\tcase 0x2A:\n  55:\t\t\treturn \"num-macs\";\n  56:\t\tcase 0x2B:\n  57:\t\t\treturn \"manufacturer\";\n  58:\t\tcase 0x2C:\n  59:\t\t\treturn \"country-code\";\n  60:\t\tcase 0x2D:\n  61:\t\t\treturn \"vendor\";\n  62:\t\tcase 0x2E:\n  63:\t\t\treturn \"diag-version\";\n  64:\t\tcase 0x2F:\n  65:\t\t\treturn \"service-tag\";\n  66:\t\tcase 0xFD:\n  67:\t\t\treturn \"vendor-extension\";\n  68:\t\tcase 0xFE:\n  69:\t\t\treturn \"crc32\";\n  70:\t\tdefault:\n  71:\t\t\tbreak;\n  72:\t\t}\n  73:\t\n  74:\t\treturn NULL;\n  75:\t}\n  76:\t\n  77:\tstatic int onie_tlv_mac_read_cb(void *priv, const char *id, int index,\n  78:\t\t\t\t\tunsigned int offset, void *buf,\n  79:\t\t\t\t\tsize_t bytes)\n  80:\t{\n  81:\t\teth_addr_add(buf, index);\n  82:\t\n  83:\t\treturn 0;\n  84:\t}\n  85:\t\n  86:\tstatic nvmem_cell_post_process_t onie_tlv_read_cb(u8 type, u8 *buf)\n  87:\t{\n  88:\t\tswitch (type) {\n  89:\t\tcase 0x24:\n  90:\t\t\treturn \u0026onie_tlv_mac_read_cb;\n  91:\t\tdefault:\n  92:\t\t\tbreak;\n  93:\t\t}\n  94:\t\n  95:\t\treturn NULL;\n  96:\t}\n  97:\t\n  98:\tstatic int onie_tlv_add_cells(struct device *dev, struct nvmem_device *nvmem,\n  99:\t\t\t\t      size_t data_len, u8 *data)\n 100:\t{\n"
}

gemini-3.8-flash

null

null

							input: 4903
							output: 42
							thoughts: 22
						

Here's my summary, as if I were thinking these thoughts:

**Analyzing `drivers/nvmem/layouts/onie-tlv.c`**

Alright, time to dive into this `onie-tlv.c` file within the `drivers/nvmem/layouts` directory. I'm already anticipating what I'll find here, knowing the ONIE context. This is likely handling the parsing and interpretation of the ONIE TLV (Type-Length-Value) data structures that store vital information about network devices – things like product details, serial numbers, and other system configuration parameters that are crucial for ONIE's functionality. I need to understand how the driver interfaces with the NVMEM framework to get at this data. I'll be looking closely at the data structures defined, and how the code reads and validates the TLV blocks. Specifically I'm interested in how it handles the different TLV types, checks lengths, and deals with potential errors in the data. Any interesting data validation will be of note, as well as if there are any specific tricks to dealing with the data or special structures used for optimization. This will be key to understanding how the driver communicates with the underlying hardware, how the data is presented to the system, and how ONIE leverages this information. Let's see what’s inside.

{
  "File": "drivers/nvmem/layouts/onie-tlv.c",
  "FirstLine": 101,
  "LineCount": 100
}

{
  "Contents": " 101:\t\tstruct nvmem_cell_info cell = {};\n 102:\t\tstruct device_node *layout;\n 103:\t\tstruct onie_tlv tlv;\n 104:\t\tunsigned int hdr_len = sizeof(struct onie_tlv_hdr);\n 105:\t\tunsigned int offset = 0;\n 106:\t\tint ret;\n 107:\t\n 108:\t\tlayout = of_nvmem_layout_get_container(nvmem);\n 109:\t\tif (!layout)\n 110:\t\t\treturn -ENOENT;\n 111:\t\n 112:\t\twhile (offset \u003c data_len) {\n 113:\t\t\tmemcpy(\u0026tlv, data + offset, sizeof(tlv));\n 114:\t\t\tif (offset + tlv.len \u003e= data_len) {\n 115:\t\t\t\tdev_err(dev, \"Out of bounds field (0x%x bytes at 0x%x)\\n\",\n 116:\t\t\t\t\ttlv.len, hdr_len + offset);\n 117:\t\t\t\tbreak;\n 118:\t\t\t}\n 119:\t\n 120:\t\t\tcell.name = onie_tlv_cell_name(tlv.type);\n 121:\t\t\tif (!cell.name)\n 122:\t\t\t\tcontinue;\n 123:\t\n 124:\t\t\tcell.offset = hdr_len + offset + sizeof(tlv.type) + sizeof(tlv.len);\n 125:\t\t\tcell.bytes = tlv.len;\n 126:\t\t\tcell.np = of_get_child_by_name(layout, cell.name);\n 127:\t\t\tcell.read_post_process = onie_tlv_read_cb(tlv.type, data + offset + sizeof(tlv));\n 128:\t\n 129:\t\t\tret = nvmem_add_one_cell(nvmem, \u0026cell);\n 130:\t\t\tif (ret) {\n 131:\t\t\t\tof_node_put(cell.np);\n 132:\t\t\t\tof_node_put(layout);\n 133:\t\t\t\treturn ret;\n 134:\t\t\t}\n 135:\t\n 136:\t\t\toffset += sizeof(tlv) + tlv.len;\n 137:\t\t}\n 138:\t\n 139:\t\tof_node_put(layout);\n 140:\t\n 141:\t\treturn 0;\n 142:\t}\n 143:\t\n 144:\tstatic bool onie_tlv_hdr_is_valid(struct device *dev, struct onie_tlv_hdr *hdr)\n 145:\t{\n 146:\t\tif (memcmp(hdr-\u003eid, ONIE_TLV_HDR_ID, sizeof(hdr-\u003eid))) {\n 147:\t\t\tdev_err(dev, \"Invalid header\\n\");\n 148:\t\t\treturn false;\n 149:\t\t}\n 150:\t\n 151:\t\tif (hdr-\u003eversion != 0x1) {\n 152:\t\t\tdev_err(dev, \"Invalid version number\\n\");\n 153:\t\t\treturn false;\n 154:\t\t}\n 155:\t\n 156:\t\treturn true;\n 157:\t}\n 158:\t\n 159:\tstatic bool onie_tlv_crc_is_valid(struct device *dev, size_t table_len, u8 *table)\n 160:\t{\n 161:\t\tstruct onie_tlv crc_hdr;\n 162:\t\tu32 read_crc, calc_crc;\n 163:\t\t__be32 crc_be;\n 164:\t\n 165:\t\tmemcpy(\u0026crc_hdr, table + table_len - ONIE_TLV_CRC_FIELD_SZ, sizeof(crc_hdr));\n 166:\t\tif (crc_hdr.type != 0xfe || crc_hdr.len != ONIE_TLV_CRC_SZ) {\n 167:\t\t\tdev_err(dev, \"Invalid CRC field\\n\");\n 168:\t\t\treturn false;\n 169:\t\t}\n 170:\t\n 171:\t\t/* The table contains a JAMCRC, which is XOR'ed compared to the original\n 172:\t\t * CRC32 implementation as known in the Ethernet world.\n 173:\t\t */\n 174:\t\tmemcpy(\u0026crc_be, table + table_len - ONIE_TLV_CRC_SZ, ONIE_TLV_CRC_SZ);\n 175:\t\tread_crc = be32_to_cpu(crc_be);\n 176:\t\tcalc_crc = crc32(~0, table, table_len - ONIE_TLV_CRC_SZ) ^ 0xFFFFFFFF;\n 177:\t\tif (read_crc != calc_crc) {\n 178:\t\t\tdev_err(dev, \"Invalid CRC read: 0x%08x, expected: 0x%08x\\n\",\n 179:\t\t\t\tread_crc, calc_crc);\n 180:\t\t\treturn false;\n 181:\t\t}\n 182:\t\n 183:\t\treturn true;\n 184:\t}\n 185:\t\n 186:\tstatic int onie_tlv_parse_table(struct nvmem_layout *layout)\n 187:\t{\n 188:\t\tstruct nvmem_device *nvmem = layout-\u003envmem;\n 189:\t\tstruct device *dev = \u0026layout-\u003edev;\n 190:\t\tstruct onie_tlv_hdr hdr;\n 191:\t\tsize_t table_len, data_len, hdr_len;\n 192:\t\tu8 *table, *data;\n 193:\t\tint ret;\n 194:\t\n 195:\t\tret = nvmem_device_read(nvmem, 0, sizeof(hdr), \u0026hdr);\n 196:\t\tif (ret \u003c 0)\n 197:\t\t\treturn ret;\n 198:\t\n 199:\t\tif (!onie_tlv_hdr_is_valid(dev, \u0026hdr)) {\n 200:\t\t\tdev_err(dev, \"Invalid ONIE TLV header\\n\");\n"
}

gemini-3.8-flash

null

null

							input: 6850
							output: 41
							thoughts: 16
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Analyzing the Codebase: Line 200 and Beyond**

Okay, so I've reached line 200, and my initial scan suggests this is likely a critical section. I need to get a broader view. My next step is obviously to keep reading the file beyond that point. I'm looking for the structure of the file, important variables or function definitions, or an indication of why the code would require additional study. I anticipate that specific implementation strategies will depend upon the specific code in the later lines. I need to understand the control flow, any potential dependencies, and whether this section is involved in a critical performance path or relates to a particular subsystem. I want to build a coherent mental model of how the code works beyond the current point of interest. This isn't just about reading; it's about forming hypotheses about the code's behavior, and beginning the process of validating or refuting them against the upcoming sections of the file.

{
  "File": "drivers/nvmem/layouts/onie-tlv.c",
  "FirstLine": 201,
  "LineCount": 60
}

{
  "Contents": " 201:\t\t\treturn -EINVAL;\n 202:\t\t}\n 203:\t\n 204:\t\thdr_len = sizeof(hdr.id) + sizeof(hdr.version) + sizeof(hdr.data_len);\n 205:\t\tdata_len = be16_to_cpu(hdr.data_len);\n 206:\t\ttable_len = hdr_len + data_len;\n 207:\t\tif (table_len \u003e ONIE_TLV_MAX_LEN) {\n 208:\t\t\tdev_err(dev, \"Invalid ONIE TLV data length\\n\");\n 209:\t\t\treturn -EINVAL;\n 210:\t\t}\n 211:\t\n 212:\t\ttable = devm_kmalloc(dev, table_len, GFP_KERNEL);\n 213:\t\tif (!table)\n 214:\t\t\treturn -ENOMEM;\n 215:\t\n 216:\t\tret = nvmem_device_read(nvmem, 0, table_len, table);\n 217:\t\tif (ret != table_len)\n 218:\t\t\treturn ret;\n 219:\t\n 220:\t\tif (!onie_tlv_crc_is_valid(dev, table_len, table))\n 221:\t\t\treturn -EINVAL;\n 222:\t\n 223:\t\tdata = table + hdr_len;\n 224:\t\tret = onie_tlv_add_cells(dev, nvmem, data_len, data);\n 225:\t\tif (ret)\n 226:\t\t\treturn ret;\n 227:\t\n 228:\t\treturn 0;\n 229:\t}\n 230:\t\n 231:\tstatic int onie_tlv_probe(struct nvmem_layout *layout)\n 232:\t{\n 233:\t\tlayout-\u003eadd_cells = onie_tlv_parse_table;\n 234:\t\n 235:\t\treturn nvmem_layout_register(layout);\n 236:\t}\n 237:\t\n 238:\tstatic void onie_tlv_remove(struct nvmem_layout *layout)\n 239:\t{\n 240:\t\tnvmem_layout_unregister(layout);\n 241:\t}\n 242:\t\n 243:\tstatic const struct of_device_id onie_tlv_of_match_table[] = {\n 244:\t\t{ .compatible = \"onie,tlv-layout\", },\n 245:\t\t{},\n 246:\t};\n 247:\tMODULE_DEVICE_TABLE(of, onie_tlv_of_match_table);\n 248:\t\n 249:\tstatic struct nvmem_layout_driver onie_tlv_layout = {\n 250:\t\t.driver = {\n 251:\t\t\t.name = \"onie-tlv-layout\",\n 252:\t\t\t.of_match_table = onie_tlv_of_match_table,\n 253:\t\t},\n 254:\t\t.probe = onie_tlv_probe,\n 255:\t\t.remove = onie_tlv_remove,\n 256:\t};\n 257:\tmodule_nvmem_layout_driver(onie_tlv_layout);\n 258:\t\n 259:\tMODULE_LICENSE(\"GPL\");\n 260:\tMODULE_AUTHOR(\"Miquel Raynal \u003cmiquel.raynal@bootlin.com\u003e\");\n"
}

gemini-3.8-flash

null

null

							input: 8036
							output: 35
							thoughts: 11
						

Okay, let's dive into this. Here's my take on those thoughts, as if they're my own:

**Kconfig Check for This Layout Driver**

Alright, I'm thinking I need to start by looking at the Kconfig file for this particular layout driver. It's the logical first step to understand the build configuration options and dependencies. I want to see what features are controllable, what assumptions are baked in, and how it integrates with the rest of the kernel build system. Basically, I want to immediately get a handle on what knobs I have to tweak and what the big picture is for its inclusion or exclusion. I need to understand this module. This is where the story begins.

{
  "Expression": "NVMEM_LAYOUTS|onie-tlv",
  "PathPrefix": "drivers/nvmem"
}

{
  "Output": "drivers/nvmem/Kconfig=2=menuconfig NVMEM\ndrivers/nvmem/Kconfig-3-\tbool \"NVMEM Support\"\ndrivers/nvmem/Kconfig:4:\timply NVMEM_LAYOUTS\ndrivers/nvmem/Kconfig-5-\thelp\n--\ndrivers/nvmem/Makefile=7=nvmem_core-y\t\t\t:= core.o\ndrivers/nvmem/Makefile:8:obj-$(CONFIG_NVMEM_LAYOUTS)\t+= nvmem_layouts.o\ndrivers/nvmem/Makefile-9-nvmem_layouts-y\t\t\t:= layouts.o\n--\ndrivers/nvmem/layouts/Kconfig-2-\ndrivers/nvmem/layouts/Kconfig:3:config NVMEM_LAYOUTS\ndrivers/nvmem/layouts/Kconfig-4-\tbool\n--\ndrivers/nvmem/layouts/Kconfig-6-\ndrivers/nvmem/layouts/Kconfig:7:if NVMEM_LAYOUTS\ndrivers/nvmem/layouts/Kconfig-8-\n--\ndrivers/nvmem/layouts/Makefile=6=obj-$(CONFIG_NVMEM_LAYOUT_SL28_VPD) += sl28vpd.o\ndrivers/nvmem/layouts/Makefile:7:obj-$(CONFIG_NVMEM_LAYOUT_ONIE_TLV) += onie-tlv.o\ndrivers/nvmem/layouts/Makefile-8-obj-$(CONFIG_NVMEM_LAYOUT_U_BOOT_ENV) += u-boot-env.o\n--\ndrivers/nvmem/layouts/onie-tlv.c=249=static struct nvmem_layout_driver onie_tlv_layout = {\ndrivers/nvmem/layouts/onie-tlv.c-250-\t.driver = {\ndrivers/nvmem/layouts/onie-tlv.c:251:\t\t.name = \"onie-tlv-layout\",\ndrivers/nvmem/layouts/onie-tlv.c-252-\t\t.of_match_table = onie_tlv_of_match_table,\n--\ndrivers/nvmem/layouts/u-boot-env.h-2-\ndrivers/nvmem/layouts/u-boot-env.h:3:#ifndef _LINUX_NVMEM_LAYOUTS_U_BOOT_ENV_H\ndrivers/nvmem/layouts/u-boot-env.h:4:#define _LINUX_NVMEM_LAYOUTS_U_BOOT_ENV_H\ndrivers/nvmem/layouts/u-boot-env.h-5-\n--\ndrivers/nvmem/layouts/u-boot-env.h=12=int u_boot_env_parse(struct device *dev, struct nvmem_device *nvmem,\n--\ndrivers/nvmem/layouts/u-boot-env.h-14-\ndrivers/nvmem/layouts/u-boot-env.h:15:#endif  /* ifndef _LINUX_NVMEM_LAYOUTS_U_BOOT_ENV_H */\n"
}

gemini-3.8-flash

null

null

							input: 8945
							output: 35
							thoughts: 15
						

Here's my take on the thought process, as if I were the one thinking it:

**Navigating the NVMEM Driver Landscape**

Okay, so I need to dig into the NVMEM driver configuration. I remember there's a specific directory structure for those layouts, so let's start with `drivers/nvmem/layouts/Kconfig`. That Kconfig file is the linchpin, isn't it? It dictates what features are enabled, what options are available, and how the various layout options are organized within the build system. That's where I need to be, that's where the decision making and build configurations must take place, if I'm going to understand this NVMEM stuff better. I know the Kconfig files are the most important part!

{
  "File": "drivers/nvmem/layouts/Kconfig",
  "FirstLine": 1,
  "LineCount": 50
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0\n   2:\t\n   3:\tconfig NVMEM_LAYOUTS\n   4:\t\tbool\n   5:\t\tdepends on OF\n   6:\t\n   7:\tif NVMEM_LAYOUTS\n   8:\t\n   9:\tmenu \"Layout Types\"\n  10:\t\n  11:\tconfig NVMEM_LAYOUT_SL28_VPD\n  12:\t\ttristate \"Kontron sl28 VPD layout support\"\n  13:\t\tselect CRC8\n  14:\t\thelp\n  15:\t\t  Say Y here if you want to support the VPD layout of the Kontron\n  16:\t\t  SMARC-sAL28 boards.\n  17:\t\n  18:\t\t  If unsure, say N.\n  19:\t\n  20:\tconfig NVMEM_LAYOUT_ONIE_TLV\n  21:\t\ttristate \"ONIE tlv support\"\n  22:\t\tselect CRC32\n  23:\t\thelp\n  24:\t\t  Say Y here if you want to support the Open Compute Project ONIE\n  25:\t\t  Type-Length-Value standard table.\n  26:\t\n  27:\t\t  If unsure, say N.\n  28:\t\n  29:\tconfig NVMEM_LAYOUT_U_BOOT_ENV\n  30:\t\ttristate \"U-Boot environment variables layout\"\n  31:\t\tselect CRC32\n  32:\t\tselect GENERIC_NET_UTILS\n  33:\t\thelp\n  34:\t\t  U-Boot stores its setup as environment variables. This driver adds\n  35:\t\t  support for verifying \u0026 exporting such data. It also exposes variables\n  36:\t\t  as NVMEM cells so they can be referenced by other drivers.\n  37:\t\n  38:\t\t  If unsure, say N.\n  39:\t\n  40:\tendmenu\n  41:\t\n  42:\tendif\n"
}

gemini-3.8-flash

null

null

							input: 9659
							output: 39
							thoughts: 155
						

**Analyzing the ONIE TLV NVMEM Layout Driver**

Okay, so `NVMEM_LAYOUT_ONIE_TLV` is contingent on `NVMEM_LAYOUTS`, which, in turn, hinges on `OF`. That's the baseline, but I need to understand how the `onie-tlv` driver actually gets instantiated and bound. Let's dig in. Aha, I see: there's this `onie_tlv_of_match_table` defined, specifically looking for a "onie,tlv-layout" compatible string. And then it's registered as a module using `module_nvmem_layout_driver(onie_tlv_layout)`. Now, the crucial question: Where is `onie_tlv_layout` actually probed? I need to track down how it's being linked. I'm going to search the `drivers/nvmem` directory for calls to `nvmem_layout_register` and `module_nvmem_layout_driver` to trace the execution path. This should reveal the mechanism by which the device tree is leveraged for this particular NVMEM layout.

{
  "Expression": "module_nvmem_layout_driver|nvmem_layout_register",
  "PathPrefix": "drivers/nvmem"
}

{
  "Output": "drivers/nvmem/core.c=843=static int nvmem_add_cells_from_fixed_layout(struct nvmem_device *nvmem)\n--\ndrivers/nvmem/core.c-859-\ndrivers/nvmem/core.c:860:int nvmem_layout_register(struct nvmem_layout *layout)\ndrivers/nvmem/core.c-861-{\n--\ndrivers/nvmem/core.c-881-}\ndrivers/nvmem/core.c:882:EXPORT_SYMBOL_GPL(nvmem_layout_register);\ndrivers/nvmem/core.c-883-\n--\ndrivers/nvmem/layouts/onie-tlv.c=231=static int onie_tlv_probe(struct nvmem_layout *layout)\n--\ndrivers/nvmem/layouts/onie-tlv.c-234-\ndrivers/nvmem/layouts/onie-tlv.c:235:\treturn nvmem_layout_register(layout);\ndrivers/nvmem/layouts/onie-tlv.c-236-}\n--\ndrivers/nvmem/layouts/onie-tlv.c=249=static struct nvmem_layout_driver onie_tlv_layout = {\n--\ndrivers/nvmem/layouts/onie-tlv.c-256-};\ndrivers/nvmem/layouts/onie-tlv.c:257:module_nvmem_layout_driver(onie_tlv_layout);\ndrivers/nvmem/layouts/onie-tlv.c-258-\n--\ndrivers/nvmem/layouts/sl28vpd.c=139=static int sl28vpd_probe(struct nvmem_layout *layout)\n--\ndrivers/nvmem/layouts/sl28vpd.c-142-\ndrivers/nvmem/layouts/sl28vpd.c:143:\treturn nvmem_layout_register(layout);\ndrivers/nvmem/layouts/sl28vpd.c-144-}\n--\ndrivers/nvmem/layouts/sl28vpd.c=157=static struct nvmem_layout_driver sl28vpd_layout = {\n--\ndrivers/nvmem/layouts/sl28vpd.c-164-};\ndrivers/nvmem/layouts/sl28vpd.c:165:module_nvmem_layout_driver(sl28vpd_layout);\ndrivers/nvmem/layouts/sl28vpd.c-166-\n--\ndrivers/nvmem/layouts/u-boot-env.c=181=static int u_boot_env_probe(struct nvmem_layout *layout)\n--\ndrivers/nvmem/layouts/u-boot-env.c-184-\ndrivers/nvmem/layouts/u-boot-env.c:185:\treturn nvmem_layout_register(layout);\ndrivers/nvmem/layouts/u-boot-env.c-186-}\n--\ndrivers/nvmem/layouts/u-boot-env.c=201=static struct nvmem_layout_driver u_boot_env_layout = {\n--\ndrivers/nvmem/layouts/u-boot-env.c-208-};\ndrivers/nvmem/layouts/u-boot-env.c:209:module_nvmem_layout_driver(u_boot_env_layout);\ndrivers/nvmem/layouts/u-boot-env.c-210-\n"
}

gemini-3.8-flash

null

null

							input: 10939
							output: 22
							thoughts: 24
						

Here's my take on those thoughts, tailored for an expert audience:

**Diving into the `module_nvmem_layout_driver` Code**

Okay, so I need to refresh my understanding of how this specific `nvmem` layout driver is constructed. My initial focus is pinpointing the exact definition of `module_nvmem_layout_driver`. Where is it declared, and what's the fundamental structure driving it? I'm thinking I'll start by tracing the function calls. I'm especially interested in how it interacts with the broader `nvmem` framework. My goal is to quickly grasp the layout mechanics, especially in the context of this specific driver. I'll be looking for things like how memory regions are defined, how data is organized within the `nvmem` space, and the driver's interface for reading and writing those regions. I'll need to remember any nuances here if there's any implementation detail I am not clear on or have forgotten, as the details matter a lot in this kind of driver. It's often the small things that can be important here!

{
  "Expression": "module_nvmem_layout_driver"
}

{
  "Output": "drivers/nvmem/layouts/onie-tlv.c=249=static struct nvmem_layout_driver onie_tlv_layout = {\n--\ndrivers/nvmem/layouts/onie-tlv.c-256-};\ndrivers/nvmem/layouts/onie-tlv.c:257:module_nvmem_layout_driver(onie_tlv_layout);\ndrivers/nvmem/layouts/onie-tlv.c-258-\n--\ndrivers/nvmem/layouts/sl28vpd.c=157=static struct nvmem_layout_driver sl28vpd_layout = {\n--\ndrivers/nvmem/layouts/sl28vpd.c-164-};\ndrivers/nvmem/layouts/sl28vpd.c:165:module_nvmem_layout_driver(sl28vpd_layout);\ndrivers/nvmem/layouts/sl28vpd.c-166-\n--\ndrivers/nvmem/layouts/u-boot-env.c=201=static struct nvmem_layout_driver u_boot_env_layout = {\n--\ndrivers/nvmem/layouts/u-boot-env.c-208-};\ndrivers/nvmem/layouts/u-boot-env.c:209:module_nvmem_layout_driver(u_boot_env_layout);\ndrivers/nvmem/layouts/u-boot-env.c-210-\n--\ninclude/linux/nvmem-provider.h=184=void nvmem_layout_driver_unregister(struct nvmem_layout_driver *drv);\ninclude/linux/nvmem-provider.h:185:#define module_nvmem_layout_driver(__nvmem_layout_driver)\t\t\\\ninclude/linux/nvmem-provider.h-186-\tmodule_driver(__nvmem_layout_driver, nvmem_layout_driver_register, \\\n"
}

gemini-3.8-flash

null

null

							input: 11684
							output: 22
							thoughts: 43
						

Here's my thinking process:

**Diving into the NVMEM Driver Landscape**

Okay, so I need to figure out where `nvmem_layout_driver_register` is defined. My first instinct, as always, is to head directly to the source. Let's start with the header file, `include/linux/nvmem-provider.h`, since that's where a lot of the core structures and definitions for NVMEM providers live. It's the logical place to start looking for related functions.

If it's not in the header, then it's probably defined in a corresponding driver file. Since this seems layout-specific, I'll check `drivers/nvmem/layouts.c`. This is where I'd expect to find any code dealing with specific NVMEM layout drivers, as suggested by the name of the file. That should be the place to start looking at where the registration is handled. I'll need to confirm if it's there or elsewhere. The goal is to track down the implementation of that function.

{
  "Expression": "nvmem_layout_driver_register"
}

{
  "Output": "drivers/nvmem/layouts.c=60=static const struct bus_type nvmem_layout_bus_type = {\n--\ndrivers/nvmem/layouts.c-67-\ndrivers/nvmem/layouts.c:68:int __nvmem_layout_driver_register(struct nvmem_layout_driver *drv,\ndrivers/nvmem/layouts.c-69-\t\t\t\t   struct module *owner)\n--\ndrivers/nvmem/layouts.c-75-}\ndrivers/nvmem/layouts.c:76:EXPORT_SYMBOL_GPL(__nvmem_layout_driver_register);\ndrivers/nvmem/layouts.c-77-\n--\ninclude/linux/nvmem-provider.h=178=void nvmem_layout_unregister(struct nvmem_layout *layout);\ninclude/linux/nvmem-provider.h-179-\ninclude/linux/nvmem-provider.h:180:#define nvmem_layout_driver_register(drv) \\\ninclude/linux/nvmem-provider.h:181:\t__nvmem_layout_driver_register(drv, THIS_MODULE)\ninclude/linux/nvmem-provider.h:182:int __nvmem_layout_driver_register(struct nvmem_layout_driver *drv,\ninclude/linux/nvmem-provider.h-183-\t\t\t\t   struct module *owner);\ninclude/linux/nvmem-provider.h=184=void nvmem_layout_driver_unregister(struct nvmem_layout_driver *drv);\ninclude/linux/nvmem-provider.h-185-#define module_nvmem_layout_driver(__nvmem_layout_driver)\t\t\\\ninclude/linux/nvmem-provider.h:186:\tmodule_driver(__nvmem_layout_driver, nvmem_layout_driver_register, \\\ninclude/linux/nvmem-provider.h-187-\t\t      nvmem_layout_driver_unregister)\n"
}

gemini-3.8-flash

null

null

							input: 12450
							output: 34
							thoughts: 26
						

Here's my summary, as though I'm thinking through this process:

**Diving into the nvmem Layout Device Registration**

Okay, time to get my hands dirty. I'm going to take a look at the `drivers/nvmem/layouts.c` file. My goal is to understand precisely how nvmem layout devices are registered and instantiated within the kernel. I need to see the mechanics – the exact functions, data structures, and the overall flow involved in setting these devices up. It's that critical initial setup that I'm after, the initial groundwork for these non-volatile memory layouts. I want to see how the kernel knows about them and makes them available.

{
  "File": "drivers/nvmem/layouts.c",
  "FirstLine": 1,
  "LineCount": 80
}

{
  "Contents": "   1:\t// SPDX-License-Identifier: GPL-2.0\n   2:\t/*\n   3:\t * NVMEM layout bus handling\n   4:\t *\n   5:\t * Copyright (C) 2023 Bootlin\n   6:\t * Author: Miquel Raynal \u003cmiquel.raynal@bootlin.com\n   7:\t */\n   8:\t\n   9:\t#include \u003clinux/device.h\u003e\n  10:\t#include \u003clinux/dma-mapping.h\u003e\n  11:\t#include \u003clinux/nvmem-consumer.h\u003e\n  12:\t#include \u003clinux/nvmem-provider.h\u003e\n  13:\t#include \u003clinux/of.h\u003e\n  14:\t#include \u003clinux/of_device.h\u003e\n  15:\t#include \u003clinux/of_irq.h\u003e\n  16:\t\n  17:\t#include \"internals.h\"\n  18:\t\n  19:\t#define to_nvmem_layout_driver(drv) \\\n  20:\t\t(container_of_const((drv), struct nvmem_layout_driver, driver))\n  21:\t#define to_nvmem_layout_device(_dev) \\\n  22:\t\tcontainer_of((_dev), struct nvmem_layout, dev)\n  23:\t\n  24:\tstatic int nvmem_layout_bus_match(struct device *dev, const struct device_driver *drv)\n  25:\t{\n  26:\t\treturn of_driver_match_device(dev, drv);\n  27:\t}\n  28:\t\n  29:\tstatic int nvmem_layout_bus_probe(struct device *dev)\n  30:\t{\n  31:\t\tstruct nvmem_layout_driver *drv = to_nvmem_layout_driver(dev-\u003edriver);\n  32:\t\tstruct nvmem_layout *layout = to_nvmem_layout_device(dev);\n  33:\t\n  34:\t\tif (!drv-\u003eprobe || !drv-\u003eremove)\n  35:\t\t\treturn -EINVAL;\n  36:\t\n  37:\t\treturn drv-\u003eprobe(layout);\n  38:\t}\n  39:\t\n  40:\tstatic void nvmem_layout_bus_remove(struct device *dev)\n  41:\t{\n  42:\t\tstruct nvmem_layout_driver *drv = to_nvmem_layout_driver(dev-\u003edriver);\n  43:\t\tstruct nvmem_layout *layout = to_nvmem_layout_device(dev);\n  44:\t\n  45:\t\treturn drv-\u003eremove(layout);\n  46:\t}\n  47:\t\n  48:\tstatic int nvmem_layout_bus_uevent(const struct device *dev,\n  49:\t\t\t\t\t   struct kobj_uevent_env *env)\n  50:\t{\n  51:\t\tint ret;\n  52:\t\n  53:\t\tret = of_device_uevent_modalias(dev, env);\n  54:\t\tif (ret != -ENODEV)\n  55:\t\t\treturn ret;\n  56:\t\n  57:\t\treturn 0;\n  58:\t}\n  59:\t\n  60:\tstatic const struct bus_type nvmem_layout_bus_type = {\n  61:\t\t.name\t\t= \"nvmem-layout\",\n  62:\t\t.match\t\t= nvmem_layout_bus_match,\n  63:\t\t.probe\t\t= nvmem_layout_bus_probe,\n  64:\t\t.remove\t\t= nvmem_layout_bus_remove,\n  65:\t\t.uevent\t\t= nvmem_layout_bus_uevent,\n  66:\t};\n  67:\t\n  68:\tint __nvmem_layout_driver_register(struct nvmem_layout_driver *drv,\n  69:\t\t\t\t\t   struct module *owner)\n  70:\t{\n  71:\t\tdrv-\u003edriver.bus = \u0026nvmem_layout_bus_type;\n  72:\t\tdrv-\u003edriver.owner = owner;\n  73:\t\n  74:\t\treturn driver_register(\u0026drv-\u003edriver);\n  75:\t}\n  76:\tEXPORT_SYMBOL_GPL(__nvmem_layout_driver_register);\n  77:\t\n  78:\tvoid nvmem_layout_driver_unregister(struct nvmem_layout_driver *drv)\n  79:\t{\n  80:\t\tdriver_unregister(\u0026drv-\u003edriver);\n"
}

gemini-3.8-flash

null

null

							input: 13784
							output: 35
							thoughts: 17
						

Okay, let's dive into the rest of `drivers/nvmem/layouts.c`. I need to understand this module better, and seeing the code contextually is the best way. I'm expecting to find the implementation details for the various NVMEM layout drivers here, the glue code perhaps, or maybe some helper functions related to how the NVMEM framework manages different memory layouts. I'm especially interested in how it handles the interaction between the core NVMEM infrastructure and the specific characteristics of different non-volatile memory technologies. I'll be looking for things like memory region definitions, address translation, error handling, and any specific optimizations they've implemented. My goal is to get a solid grasp of how this code works so I can evaluate its performance and portability. Let's see what's in store.

{
  "File": "drivers/nvmem/layouts.c",
  "FirstLine": 81,
  "LineCount": 80
}

{
  "Contents": "  81:\t}\n  82:\tEXPORT_SYMBOL_GPL(nvmem_layout_driver_unregister);\n  83:\t\n  84:\tstatic void nvmem_layout_release_device(struct device *dev)\n  85:\t{\n  86:\t\tstruct nvmem_layout *layout = to_nvmem_layout_device(dev);\n  87:\t\n  88:\t\tof_node_put(layout-\u003edev.of_node);\n  89:\t\tkfree(layout);\n  90:\t}\n  91:\t\n  92:\tstatic int nvmem_layout_create_device(struct nvmem_device *nvmem,\n  93:\t\t\t\t\t      struct device_node *np)\n  94:\t{\n  95:\t\tstruct nvmem_layout *layout;\n  96:\t\tstruct device *dev;\n  97:\t\tint ret;\n  98:\t\n  99:\t\tlayout = kzalloc_obj(*layout);\n 100:\t\tif (!layout)\n 101:\t\t\treturn -ENOMEM;\n 102:\t\n 103:\t\t/* Create a bidirectional link */\n 104:\t\tlayout-\u003envmem = nvmem;\n 105:\t\tnvmem-\u003elayout = layout;\n 106:\t\n 107:\t\t/* Device model registration */\n 108:\t\tdev = \u0026layout-\u003edev;\n 109:\t\tdevice_initialize(dev);\n 110:\t\tdev-\u003eparent = \u0026nvmem-\u003edev;\n 111:\t\tdev-\u003ebus = \u0026nvmem_layout_bus_type;\n 112:\t\tdev-\u003erelease = nvmem_layout_release_device;\n 113:\t\tdev-\u003ecoherent_dma_mask = DMA_BIT_MASK(32);\n 114:\t\tdev-\u003edma_mask = \u0026dev-\u003ecoherent_dma_mask;\n 115:\t\tdevice_set_node(dev, of_fwnode_handle(of_node_get(np)));\n 116:\t\tof_device_make_bus_id(dev);\n 117:\t\tof_msi_configure(dev, dev-\u003eof_node);\n 118:\t\n 119:\t\tret = device_add(dev);\n 120:\t\tif (ret) {\n 121:\t\t\tput_device(dev);\n 122:\t\t\treturn ret;\n 123:\t\t}\n 124:\t\n 125:\t\treturn 0;\n 126:\t}\n 127:\t\n 128:\tstatic const struct of_device_id of_nvmem_layout_skip_table[] = {\n 129:\t\t{ .compatible = \"fixed-layout\", },\n 130:\t\t{}\n 131:\t};\n 132:\t\n 133:\tstatic int nvmem_layout_bus_populate(struct nvmem_device *nvmem,\n 134:\t\t\t\t\t     struct device_node *layout_dn)\n 135:\t{\n 136:\t\tint ret;\n 137:\t\n 138:\t\t/* Make sure it has a compatible property */\n 139:\t\tif (!of_property_present(layout_dn, \"compatible\")) {\n 140:\t\t\tpr_debug(\"%s() - skipping %pOF, no compatible prop\\n\",\n 141:\t\t\t\t __func__, layout_dn);\n 142:\t\t\treturn 0;\n 143:\t\t}\n 144:\t\n 145:\t\t/* Fixed layouts are parsed manually somewhere else for now */\n 146:\t\tif (of_match_node(of_nvmem_layout_skip_table, layout_dn)) {\n 147:\t\t\tpr_debug(\"%s() - skipping %pOF node\\n\", __func__, layout_dn);\n 148:\t\t\treturn 0;\n 149:\t\t}\n 150:\t\n 151:\t\tif (of_node_check_flag(layout_dn, OF_POPULATED_BUS)) {\n 152:\t\t\tpr_debug(\"%s() - skipping %pOF, already populated\\n\",\n 153:\t\t\t\t __func__, layout_dn);\n 154:\t\n 155:\t\t\treturn 0;\n 156:\t\t}\n 157:\t\n 158:\t\t/* NVMEM layout buses expect only a single device representing the layout */\n 159:\t\tret = nvmem_layout_create_device(nvmem, layout_dn);\n 160:\t\tif (ret)\n"
}

gemini-3.8-flash

null

null

							input: 15161
							output: 36
							thoughts: 56
						

Here's my summary, as if I were thinking these thoughts:

**Diving Deeper into `nvmem_layout_bus_populate` and `onie_tlv_parse_table`**

Okay, so I've been tracing the NVMEM subsystem and now I'm focused on understanding the interplay between layout configuration and the actual population of NVMEM cells. I need to get a handle on the control flow. The next logical step is to analyze `drivers/nvmem/layouts.c` more thoroughly. I want to pinpoint exactly *when* the `nvmem_layout_bus_populate` function gets called. That function is clearly critical. And more importantly, I need to see how `layout->add_cells` factors in. I know this function pointer is pointing to `onie_tlv_parse_table`, so I need to find the call. Understanding this function call will lead to a better understand of how the ONIE TLV table is used to populate NVMEM cells. Let's see how all this fits together.

{
  "File": "drivers/nvmem/layouts.c",
  "FirstLine": 161,
  "LineCount": 80
}

{
  "Contents": " 161:\t\t\treturn ret;\n 162:\t\n 163:\t\tof_node_set_flag(layout_dn, OF_POPULATED_BUS);\n 164:\t\n 165:\t\treturn 0;\n 166:\t}\n 167:\t\n 168:\tstruct device_node *of_nvmem_layout_get_container(struct nvmem_device *nvmem)\n 169:\t{\n 170:\t\treturn of_get_child_by_name(nvmem-\u003edev.of_node, \"nvmem-layout\");\n 171:\t}\n 172:\tEXPORT_SYMBOL_GPL(of_nvmem_layout_get_container);\n 173:\t\n 174:\t/*\n 175:\t * Returns the number of devices populated, 0 if the operation was not relevant\n 176:\t * for this nvmem device, an error code otherwise.\n 177:\t */\n 178:\tint nvmem_populate_layout(struct nvmem_device *nvmem)\n 179:\t{\n 180:\t\tstruct device_node *layout_dn;\n 181:\t\tint ret;\n 182:\t\n 183:\t\tlayout_dn = of_nvmem_layout_get_container(nvmem);\n 184:\t\tif (!layout_dn)\n 185:\t\t\treturn 0;\n 186:\t\n 187:\t\t/* Populate the layout device */\n 188:\t\tdevice_links_supplier_sync_state_pause();\n 189:\t\tret = nvmem_layout_bus_populate(nvmem, layout_dn);\n 190:\t\tdevice_links_supplier_sync_state_resume();\n 191:\t\n 192:\t\tof_node_put(layout_dn);\n 193:\t\treturn ret;\n 194:\t}\n 195:\t\n 196:\tvoid nvmem_destroy_layout(struct nvmem_device *nvmem)\n 197:\t{\n 198:\t\tstruct device *dev;\n 199:\t\n 200:\t\tif (!nvmem-\u003elayout)\n 201:\t\t\treturn;\n 202:\t\n 203:\t\tdev = \u0026nvmem-\u003elayout-\u003edev;\n 204:\t\tof_node_clear_flag(dev-\u003eof_node, OF_POPULATED_BUS);\n 205:\t\tdevice_unregister(dev);\n 206:\t}\n 207:\t\n 208:\tint nvmem_layout_bus_register(void)\n 209:\t{\n 210:\t\treturn bus_register(\u0026nvmem_layout_bus_type);\n 211:\t}\n 212:\t\n 213:\tvoid nvmem_layout_bus_unregister(void)\n 214:\t{\n 215:\t\tbus_unregister(\u0026nvmem_layout_bus_type);\n 216:\t}\n"
}

gemini-3.8-flash

null

null

							input: 16256
							output: 34
							thoughts: 27
						

Here's my analysis of the provided thought process:

**Tracing the NVMe Memory Layout Population**

Okay, so I'm thinking about how the non-volatile memory (NVMe) layout is populated. My immediate concern is understanding the flow of calls. I need to figure out where the `nvmem_populate_layout` function is actually being invoked. That will give me the context for how this process starts and what the initial conditions are.

Once I've got that, I'll need to follow the thread to where `layout->add_cells` is called. That call is critical because it's where the actual memory cells are being added to the layout. By tracing that path, I'll understand the data structure population, the logic behind cell allocation, and how it all fits together. This should reveal the core mechanics of the layout generation. Knowing both points of this thread is the key to understanding the full process.

{
  "Expression": "nvmem_populate_layout|add_cells",
  "PathPrefix": "drivers/nvmem"
}

{
  "Output": "drivers/nvmem/brcm_nvram.c=99=static int brcm_nvram_read_post_process_macaddr(void *context, const char *id, int index,\n--\ndrivers/nvmem/brcm_nvram.c-117-\ndrivers/nvmem/brcm_nvram.c:118:static int brcm_nvram_add_cells(struct brcm_nvram *priv, uint8_t *data,\ndrivers/nvmem/brcm_nvram.c-119-\t\t\t\tsize_t len)\n--\ndrivers/nvmem/brcm_nvram.c=178=static int brcm_nvram_parse(struct brcm_nvram *priv)\n--\ndrivers/nvmem/brcm_nvram.c-196-\ndrivers/nvmem/brcm_nvram.c:197:\terr = brcm_nvram_add_cells(priv, priv-\u003edata, len);\ndrivers/nvmem/brcm_nvram.c-198-\tif (err)\n--\ndrivers/nvmem/core.c=667=EXPORT_SYMBOL_GPL(nvmem_add_one_cell);\n--\ndrivers/nvmem/core.c-669-/**\ndrivers/nvmem/core.c:670: * nvmem_add_cells() - Add cell information to an nvmem device\ndrivers/nvmem/core.c-671- *\n--\ndrivers/nvmem/core.c-677- */\ndrivers/nvmem/core.c:678:static int nvmem_add_cells(struct nvmem_device *nvmem,\ndrivers/nvmem/core.c-679-\t\t    const struct nvmem_cell_info *info,\n--\ndrivers/nvmem/core.c=736=static int nvmem_validate_keepouts(struct nvmem_device *nvmem)\n--\ndrivers/nvmem/core.c-788-\ndrivers/nvmem/core.c:789:static int nvmem_add_cells_from_dt(struct nvmem_device *nvmem, struct device_node *np)\ndrivers/nvmem/core.c-790-{\n--\ndrivers/nvmem/core.c-837-\ndrivers/nvmem/core.c:838:static int nvmem_add_cells_from_legacy_of(struct nvmem_device *nvmem)\ndrivers/nvmem/core.c-839-{\ndrivers/nvmem/core.c:840:\treturn nvmem_add_cells_from_dt(nvmem, nvmem-\u003edev.of_node);\ndrivers/nvmem/core.c-841-}\ndrivers/nvmem/core.c-842-\ndrivers/nvmem/core.c:843:static int nvmem_add_cells_from_fixed_layout(struct nvmem_device *nvmem)\ndrivers/nvmem/core.c-844-{\n--\ndrivers/nvmem/core.c-852-\tif (of_device_is_compatible(layout_np, \"fixed-layout\"))\ndrivers/nvmem/core.c:853:\t\terr = nvmem_add_cells_from_dt(nvmem, layout_np);\ndrivers/nvmem/core.c-854-\n--\ndrivers/nvmem/core.c=860=int nvmem_layout_register(struct nvmem_layout *layout)\n--\ndrivers/nvmem/core.c-863-\ndrivers/nvmem/core.c:864:\tif (!layout-\u003eadd_cells)\ndrivers/nvmem/core.c-865-\t\treturn -EINVAL;\n--\ndrivers/nvmem/core.c-867-\t/* Populate the cells */\ndrivers/nvmem/core.c:868:\tret = layout-\u003eadd_cells(layout);\ndrivers/nvmem/core.c-869-\tif (ret)\n--\ndrivers/nvmem/core.c=900=struct nvmem_device *nvmem_register(const struct nvmem_config *config)\n--\ndrivers/nvmem/core.c-996-\tif (config-\u003ecells) {\ndrivers/nvmem/core.c:997:\t\trval = nvmem_add_cells(nvmem, config-\u003ecells, config-\u003encells);\ndrivers/nvmem/core.c-998-\t\tif (rval)\n--\ndrivers/nvmem/core.c-1002-\tif (config-\u003eadd_legacy_fixed_of_cells) {\ndrivers/nvmem/core.c:1003:\t\trval = nvmem_add_cells_from_legacy_of(nvmem);\ndrivers/nvmem/core.c-1004-\t\tif (rval)\n--\ndrivers/nvmem/core.c-1007-\ndrivers/nvmem/core.c:1008:\trval = nvmem_add_cells_from_fixed_layout(nvmem);\ndrivers/nvmem/core.c-1009-\tif (rval)\n--\ndrivers/nvmem/core.c-1017-\ndrivers/nvmem/core.c:1018:\trval = nvmem_populate_layout(nvmem);\ndrivers/nvmem/core.c-1019-\tif (rval)\n--\ndrivers/nvmem/internals.h=40=void nvmem_layout_bus_unregister(void);\ndrivers/nvmem/internals.h:41:int nvmem_populate_layout(struct nvmem_device *nvmem);\ndrivers/nvmem/internals.h-42-void nvmem_destroy_layout(struct nvmem_device *nvmem);\n--\ndrivers/nvmem/internals.h=49=static inline void nvmem_layout_bus_unregister(void) {}\ndrivers/nvmem/internals.h-50-\ndrivers/nvmem/internals.h:51:static inline int nvmem_populate_layout(struct nvmem_device *nvmem)\ndrivers/nvmem/internals.h-52-{\n--\ndrivers/nvmem/layouts.c=172=EXPORT_SYMBOL_GPL(of_nvmem_layout_get_container);\n--\ndrivers/nvmem/layouts.c-177- */\ndrivers/nvmem/layouts.c:178:int nvmem_populate_layout(struct nvmem_device *nvmem)\ndrivers/nvmem/layouts.c-179-{\n--\ndrivers/nvmem/layouts/onie-tlv.c=86=static nvmem_cell_post_process_t onie_tlv_read_cb(u8 type, u8 *buf)\n--\ndrivers/nvmem/layouts/onie-tlv.c-97-\ndrivers/nvmem/layouts/onie-tlv.c:98:static int onie_tlv_add_cells(struct device *dev, struct nvmem_device *nvmem,\ndrivers/nvmem/layouts/onie-tlv.c-99-\t\t\t      size_t data_len, u8 *data)\n--\ndrivers/nvmem/layouts/onie-tlv.c=186=static int onie_tlv_parse_table(struct nvmem_layout *layout)\n--\ndrivers/nvmem/layouts/onie-tlv.c-223-\tdata = table + hdr_len;\ndrivers/nvmem/layouts/onie-tlv.c:224:\tret = onie_tlv_add_cells(dev, nvmem, data_len, data);\ndrivers/nvmem/layouts/onie-tlv.c-225-\tif (ret)\n--\ndrivers/nvmem/layouts/onie-tlv.c=231=static int onie_tlv_probe(struct nvmem_layout *layout)\ndrivers/nvmem/layouts/onie-tlv.c-232-{\ndrivers/nvmem/layouts/onie-tlv.c:233:\tlayout-\u003eadd_cells = onie_tlv_parse_table;\ndrivers/nvmem/layouts/onie-tlv.c-234-\n--\ndrivers/nvmem/layouts/sl28vpd.c=56=static int sl28vpd_v1_check_crc(struct device *dev, struct nvmem_device *nvmem)\n--\ndrivers/nvmem/layouts/sl28vpd.c-82-\ndrivers/nvmem/layouts/sl28vpd.c:83:static int sl28vpd_add_cells(struct nvmem_layout *layout)\ndrivers/nvmem/layouts/sl28vpd.c-84-{\n--\ndrivers/nvmem/layouts/sl28vpd.c=139=static int sl28vpd_probe(struct nvmem_layout *layout)\ndrivers/nvmem/layouts/sl28vpd.c-140-{\ndrivers/nvmem/layouts/sl28vpd.c:141:\tlayout-\u003eadd_cells = sl28vpd_add_cells;\ndrivers/nvmem/layouts/sl28vpd.c-142-\n--\ndrivers/nvmem/layouts/u-boot-env.c=169=EXPORT_SYMBOL_GPL(u_boot_env_parse);\ndrivers/nvmem/layouts/u-boot-env.c-170-\ndrivers/nvmem/layouts/u-boot-env.c:171:static int u_boot_env_add_cells(struct nvmem_layout *layout)\ndrivers/nvmem/layouts/u-boot-env.c-172-{\n--\ndrivers/nvmem/layouts/u-boot-env.c=181=static int u_boot_env_probe(struct nvmem_layout *layout)\ndrivers/nvmem/layouts/u-boot-env.c-182-{\ndrivers/nvmem/layouts/u-boot-env.c:183:\tlayout-\u003eadd_cells = u_boot_env_add_cells;\ndrivers/nvmem/layouts/u-boot-env.c-184-\n"
}

gemini-3.8-flash

null

null

							input: 18978
							output: 20
							thoughts: 271
						

**My Analysis of the `onie-tlv.c` Code Path**

Okay, let's break this down systematically. I need to understand under what circumstances this `drivers/nvmem/layouts/onie-tlv.c` code actually gets executed. The first thing I see is that it's an OF (Open Firmware/Device Tree) layout driver, which is immediately interesting. My initial thought is that this is geared towards embedded systems, but I have to remind myself to be more skeptical about assumptions.

Specifically, the `onie_tlv_of_match_table` defines the `compatible` string as `"onie,tlv-layout"`. My next thought is, "Wait, we're targeting amd64! Can Device Tree even be used on amd64?" I need to remember that while it's less common, it *can* be. It's not unheard of to have OF enabled on amd64 for various reasons – maybe for testing (like `CONFIG_OF_UNITTEST`), through overlays, or even using a fake Device Tree with ACPI. So I need to keep an open mind.

Now, my key question is, *how* does an nvmem device with that `"onie,tlv-layout"` compatible string get created? How does the system recognize it and register it? I'm wondering if this could be driven by userspace, or perhaps if syzkaller is somehow involved. Does userspace have the ability to create nvmem devices or OF nodes directly? Or are overlays, dynamic device tree configuration, or virtual devices relevant here? This feels like it could be something syzkaller could trigger if there's an interaction.

To figure this out, I'm going to do a quick grep of the entire kernel tree for `"onie,tlv-layout"`. That should give me a good overview of where that string is used and therefore which parts of the system are potentially relevant. That's the best first step.

{
  "Expression": "onie,tlv-layout"
}

{
  "Output": "Documentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml=20=oneOf:\n--\nDocumentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml-22-  - $ref: kontron,sl28-vpd.yaml\nDocumentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml:23:  - $ref: onie,tlv-layout.yaml\nDocumentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml-24-  - $ref: u-boot,env.yaml\n--\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml-3----\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml:4:$id: http://devicetree.org/schemas/nvmem/layouts/onie,tlv-layout.yaml#\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml-5-$schema: http://devicetree.org/meta-schemas/core.yaml#\n--\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml=24=properties:\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml-25-  compatible:\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml:26:    const: onie,tlv-layout\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml-27-\n--\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml=105=examples:\n--\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml-116-            nvmem-layout {\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml:117:                compatible = \"onie,tlv-layout\";\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml-118-\n--\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml-137-                nvmem-layout {\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml:138:                    compatible = \"onie,tlv-layout\";\nDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml-139-\n--\nMAINTAINERS=19943=S:\tMaintained\nMAINTAINERS:19944:F:\tDocumentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml\nMAINTAINERS-19945-F:\tdrivers/nvmem/layouts/onie-tlv.c\n--\narch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts=166=\t\tnvmem-layout {\narch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts:167:\t\t\tcompatible = \"onie,tlv-layout\";\narch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts-168-\n--\narch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts=171=\t\tnvmem-layout {\narch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts:172:\t\t\tcompatible = \"onie,tlv-layout\";\narch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts-173-\n--\ndrivers/nvmem/layouts/onie-tlv.c=243=static const struct of_device_id onie_tlv_of_match_table[] = {\ndrivers/nvmem/layouts/onie-tlv.c:244:\t{ .compatible = \"onie,tlv-layout\", },\ndrivers/nvmem/layouts/onie-tlv.c-245-\t{},\n"
}

gemini-3.8-flash

null

null

							input: 20730
							output: 34
							thoughts: 492
						

**My Assessment of the ONIE TLV Layout and Syzkaller Fuzzing Applicability**

Okay, so I'm looking at these RISC-V Device Tree Source (DTS) files, specifically `k1-bananapi-f3.dts` and `k1-milkv-jupiter.dts`, and I see that only two files in the entire kernel even mention `onie,tlv-layout`. Interesting. This makes me wonder: could we leverage an OF (Open Firmware) overlay via configfs for something like this? I need to check `CONFIG_OF_CONFIGFS` and see how dynamic OF plays a role.

But, before I get too far down that path, I need to consider a bigger hurdle: does syzkaller even *do* OF overlay configfs? And even more importantly, I need to remember the primary gate for fuzzing as stated in the instructions. It highlights reachability. My priority is reachability. "Fuzzing can only discover bugs in code that can actually execute in standard virtualized environments." If the code is structurally unreachable, it MUST NOT be fuzzed. That hits hard.

Specifically, it mentions these examples of unreachable hardware and code paths: vendor-specific PCIe switches, drivers requiring physical cards, and driver teardown callbacks that only run during hot-unplug or manual unbinding. And the big one: code paths exclusive to architectures other than the target architecture.

Wait a second… *Target architecture*: amd64. That’s the key. I need to figure out if `CONFIG_NVMEM_LAYOUT_ONIE_TLV` is even selectable or enabled on amd64. I'll need to check the Kconfig files, starting with `arch/x86/Kconfig` or possibly within `drivers/nvmem/layouts/Kconfig`.

Okay, I'm checking `drivers/nvmem/layouts/Kconfig` now. It looks like `NVMEM_LAYOUTS` is a boolean, and it depends on `OF`. So now the question is: does x86/amd64 even have `CONFIG_OF` enabled or selectable? Time to grep for `CONFIG_OF` in `arch/x86/`. This is the crucial step. If `CONFIG_OF` isn't there, this whole ONIE TLV layout thing is a non-starter for syzkaller on amd64.

{
  "Expression": "config OF\\b|\\bOF\\b",
  "PathPrefix": "arch/x86"
}

{
  "Output": "arch/x86/Kconfig=666=config X86_INTEL_CE\n--\narch/x86/Kconfig-673-\tselect X86_REBOOTFIXUPS\narch/x86/Kconfig:674:\tselect OF\narch/x86/Kconfig-675-\tselect OF_EARLY_FLATTREE\n--\narch/x86/Kconfig=1518=config NUMA\n--\narch/x86/Kconfig-1522-\tselect USE_PERCPU_NUMA_NODE_ID\narch/x86/Kconfig:1523:\tselect OF_NUMA if OF\narch/x86/Kconfig-1524-\thelp\n--\narch/x86/Kconfig=3021=config OLPC\n--\narch/x86/Kconfig-3024-\tselect GPIOLIB\narch/x86/Kconfig:3025:\tselect OF\narch/x86/Kconfig-3026-\tselect OF_PROMTREE\n--\narch/x86/crypto/aes-ctr-avx-x86_64.S-16-// distributed under the License is distributed on an \"AS IS\" BASIS,\narch/x86/crypto/aes-ctr-avx-x86_64.S:17:// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\narch/x86/crypto/aes-ctr-avx-x86_64.S-18-// See the License for the specific language governing permissions and\n--\narch/x86/crypto/aes-ctr-avx-x86_64.S-34-// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\narch/x86/crypto/aes-ctr-avx-x86_64.S:35:// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\narch/x86/crypto/aes-ctr-avx-x86_64.S-36-// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE\narch/x86/crypto/aes-ctr-avx-x86_64.S-37-// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\narch/x86/crypto/aes-ctr-avx-x86_64.S:38:// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\narch/x86/crypto/aes-ctr-avx-x86_64.S:39:// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\narch/x86/crypto/aes-ctr-avx-x86_64.S:40:// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\narch/x86/crypto/aes-ctr-avx-x86_64.S-41-// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\narch/x86/crypto/aes-ctr-avx-x86_64.S:42:// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\narch/x86/crypto/aes-ctr-avx-x86_64.S:43:// POSSIBILITY OF SUCH DAMAGE.\narch/x86/crypto/aes-ctr-avx-x86_64.S-44-//\n--\narch/x86/crypto/aes-gcm-aesni-x86_64.S-20-// distributed under the License is distributed on an \"AS IS\" BASIS,\narch/x86/crypto/aes-gcm-aesni-x86_64.S:21:// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\narch/x86/crypto/aes-gcm-aesni-x86_64.S-22-// See the License for the specific language governing permissions and\n--\narch/x86/crypto/aes-gcm-aesni-x86_64.S-38-// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\narch/x86/crypto/aes-gcm-aesni-x86_64.S:39:// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\narch/x86/crypto/aes-gcm-aesni-x86_64.S-40-// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE\narch/x86/crypto/aes-gcm-aesni-x86_64.S-41-// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\narch/x86/crypto/aes-gcm-aesni-x86_64.S:42:// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\narch/x86/crypto/aes-gcm-aesni-x86_64.S:43:// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\narch/x86/crypto/aes-gcm-aesni-x86_64.S:44:// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\narch/x86/crypto/aes-gcm-aesni-x86_64.S-45-// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\narch/x86/crypto/aes-gcm-aesni-x86_64.S:46:// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\narch/x86/crypto/aes-gcm-aesni-x86_64.S:47:// POSSIBILITY OF SUCH DAMAGE.\narch/x86/crypto/aes-gcm-aesni-x86_64.S-48-//\n--\narch/x86/crypto/aes-gcm-vaes-avx2.S-21-// distributed under the License is distributed on an \"AS IS\" BASIS,\narch/x86/crypto/aes-gcm-vaes-avx2.S:22:// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\narch/x86/crypto/aes-gcm-vaes-avx2.S-23-// See the License for the specific language governing permissions and\n--\narch/x86/crypto/aes-gcm-vaes-avx2.S-39-// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\narch/x86/crypto/aes-gcm-vaes-avx2.S:40:// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\narch/x86/crypto/aes-gcm-vaes-avx2.S-41-// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE\narch/x86/crypto/aes-gcm-vaes-avx2.S-42-// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\narch/x86/crypto/aes-gcm-vaes-avx2.S:43:// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\narch/x86/crypto/aes-gcm-vaes-avx2.S:44:// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\narch/x86/crypto/aes-gcm-vaes-avx2.S:45:// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\narch/x86/crypto/aes-gcm-vaes-avx2.S-46-// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\narch/x86/crypto/aes-gcm-vaes-avx2.S:47:// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\narch/x86/crypto/aes-gcm-vaes-avx2.S:48:// POSSIBILITY OF SUCH DAMAGE.\narch/x86/crypto/aes-gcm-vaes-avx2.S-49-//\n--\narch/x86/crypto/aes-gcm-vaes-avx512.S-21-// distributed under the License is distributed on an \"AS IS\" BASIS,\narch/x86/crypto/aes-gcm-vaes-avx512.S:22:// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\narch/x86/crypto/aes-gcm-vaes-avx512.S-23-// See the License for the specific language governing permissions and\n--\narch/x86/crypto/aes-gcm-vaes-avx512.S-39-// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\narch/x86/crypto/aes-gcm-vaes-avx512.S:40:// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\narch/x86/crypto/aes-gcm-vaes-avx512.S-41-// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE\narch/x86/crypto/aes-gcm-vaes-avx512.S-42-// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\narch/x86/crypto/aes-gcm-vaes-avx512.S:43:// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\narch/x86/crypto/aes-gcm-vaes-avx512.S:44:// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\narch/x86/crypto/aes-gcm-vaes-avx512.S:45:// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\narch/x86/crypto/aes-gcm-vaes-avx512.S-46-// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\narch/x86/crypto/aes-gcm-vaes-avx512.S:47:// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\narch/x86/crypto/aes-gcm-vaes-avx512.S:48:// POSSIBILITY OF SUCH DAMAGE.\narch/x86/crypto/aes-gcm-vaes-avx512.S-49-\n--\narch/x86/crypto/aes-xts-avx-x86_64.S-20-// distributed under the License is distributed on an \"AS IS\" BASIS,\narch/x86/crypto/aes-xts-avx-x86_64.S:21:// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\narch/x86/crypto/aes-xts-avx-x86_64.S-22-// See the License for the specific language governing permissions and\n--\narch/x86/crypto/aes-xts-avx-x86_64.S-38-// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\narch/x86/crypto/aes-xts-avx-x86_64.S:39:// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\narch/x86/crypto/aes-xts-avx-x86_64.S-40-// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE\narch/x86/crypto/aes-xts-avx-x86_64.S-41-// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\narch/x86/crypto/aes-xts-avx-x86_64.S:42:// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\narch/x86/crypto/aes-xts-avx-x86_64.S:43:// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\narch/x86/crypto/aes-xts-avx-x86_64.S:44:// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\narch/x86/crypto/aes-xts-avx-x86_64.S-45-// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\narch/x86/crypto/aes-xts-avx-x86_64.S:46:// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\narch/x86/crypto/aes-xts-avx-x86_64.S:47:// POSSIBILITY OF SUCH DAMAGE.\narch/x86/crypto/aes-xts-avx-x86_64.S-48-\n--\narch/x86/include/asm/xen/cpuid.h-15- *\narch/x86/include/asm/xen/cpuid.h:16: * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\narch/x86/include/asm/xen/cpuid.h:17: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\narch/x86/include/asm/xen/cpuid.h-18- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\narch/x86/include/asm/xen/cpuid.h-19- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\narch/x86/include/asm/xen/cpuid.h:20: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\narch/x86/include/asm/xen/cpuid.h:21: * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER\narch/x86/include/asm/xen/cpuid.h-22- * DEALINGS IN THE SOFTWARE.\n--\narch/x86/include/asm/xen/hypercall.h-23- *\narch/x86/include/asm/xen/hypercall.h:24: * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\narch/x86/include/asm/xen/hypercall.h:25: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\narch/x86/include/asm/xen/hypercall.h-26- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\narch/x86/include/asm/xen/hypercall.h-27- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\narch/x86/include/asm/xen/hypercall.h:28: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\narch/x86/include/asm/xen/hypercall.h:29: * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\narch/x86/include/asm/xen/hypercall.h-30- * IN THE SOFTWARE.\n--\narch/x86/include/asm/xen/hypervisor.h-23- *\narch/x86/include/asm/xen/hypervisor.h:24: * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\narch/x86/include/asm/xen/hypervisor.h:25: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\narch/x86/include/asm/xen/hypervisor.h-26- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\narch/x86/include/asm/xen/hypervisor.h-27- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\narch/x86/include/asm/xen/hypervisor.h:28: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\narch/x86/include/asm/xen/hypervisor.h:29: * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\narch/x86/include/asm/xen/hypervisor.h-30- * IN THE SOFTWARE.\n--\narch/x86/include/asm/xen/interface.h-15- *\narch/x86/include/asm/xen/interface.h:16: * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\narch/x86/include/asm/xen/interface.h:17: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\narch/x86/include/asm/xen/interface.h-18- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\narch/x86/include/asm/xen/interface.h-19- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\narch/x86/include/asm/xen/interface.h:20: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\narch/x86/include/asm/xen/interface.h:21: * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER\narch/x86/include/asm/xen/interface.h-22- * DEALINGS IN THE SOFTWARE.\n--\narch/x86/include/uapi/asm/svm.h-168-\t{ SVM_EXIT_EXCP_BASE + BP_VECTOR,       \"BP excp\" }, \\\narch/x86/include/uapi/asm/svm.h:169:\t{ SVM_EXIT_EXCP_BASE + OF_VECTOR,       \"OF excp\" }, \\\narch/x86/include/uapi/asm/svm.h-170-\t{ SVM_EXIT_EXCP_BASE + BR_VECTOR,       \"BR excp\" }, \\\n--\narch/x86/kernel/devicetree.c-2-/*\narch/x86/kernel/devicetree.c:3: * Architecture specific OF callbacks.\narch/x86/kernel/devicetree.c-4- */\n--\narch/x86/kernel/devicetree.c=257=static void __init dtb_ioapic_setup(void)\n--\narch/x86/kernel/devicetree.c-267-\t}\narch/x86/kernel/devicetree.c:268:\tpr_err(\"Error: No information about IO-APIC in OF.\\n\");\narch/x86/kernel/devicetree.c-269-}\n--\narch/x86/kernel/relocate_kernel_64.S=522=SYM_CODE_START_NOALIGN(kexec_debug_exc_vectors)\n--\narch/x86/kernel/relocate_kernel_64.S-545-\tvec_noerr  3 // #BP\narch/x86/kernel/relocate_kernel_64.S:546:\tvec_noerr  4 // #OF\narch/x86/kernel/relocate_kernel_64.S-547-\tvec_noerr  5 // #BR\n--\narch/x86/kernel/uprobes.c=1271=static bool branch_is_call(struct arch_uprobe *auprobe)\n--\narch/x86/kernel/uprobes.c-1276-#define CASE_COND\t\t\t\t\t\\\narch/x86/kernel/uprobes.c:1277:\tCOND(70, 71, XF(OF))\t\t\t\t\\\narch/x86/kernel/uprobes.c-1278-\tCOND(72, 73, XF(CF))\t\t\t\t\\\n--\narch/x86/kernel/uprobes.c-1282-\tCOND(76, 77, XF(CF) || XF(ZF))\t\t\t\\\narch/x86/kernel/uprobes.c:1283:\tCOND(7c, 7d, XF(SF) != XF(OF))\t\t\t\\\narch/x86/kernel/uprobes.c:1284:\tCOND(7e, 7f, XF(ZF) || XF(SF) != XF(OF))\narch/x86/kernel/uprobes.c-1285-\n--\narch/x86/kvm/i8254.c-19- *\narch/x86/kvm/i8254.c:20: * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\narch/x86/kvm/i8254.c:21: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\narch/x86/kvm/i8254.c-22- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL\narch/x86/kvm/i8254.c-23- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\narch/x86/kvm/i8254.c:24: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\narch/x86/kvm/i8254.c:25: * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\narch/x86/kvm/i8254.c-26- * THE SOFTWARE.\n--\narch/x86/kvm/i8259.c-17- *\narch/x86/kvm/i8259.c:18: * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\narch/x86/kvm/i8259.c:19: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\narch/x86/kvm/i8259.c-20- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL\narch/x86/kvm/i8259.c-21- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\narch/x86/kvm/i8259.c:22: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\narch/x86/kvm/i8259.c:23: * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\narch/x86/kvm/i8259.c-24- * THE SOFTWARE.\n--\narch/x86/kvm/trace.h=439=TRACE_EVENT(kvm_inj_virq,\n--\narch/x86/kvm/trace.h-462-#define kvm_trace_sym_exc\t\t\t\t\t\t\\\narch/x86/kvm/trace.h:463:\tEXS(DE), EXS(DB), EXS(BP), EXS(OF), EXS(BR), EXS(UD), EXS(NM),\t\\\narch/x86/kvm/trace.h-464-\tEXS(DF), EXS(TS), EXS(NP), EXS(SS), EXS(GP), EXS(PF), EXS(MF),\t\\\n"
}

gemini-3.8-flash

null

null

							input: 27376
							output: 32
							thoughts: 22
						

Here's my summary, as though I'm thinking through this process:

**Diving into the Device Tree Configuration**

Okay, so I need to figure out how the `CONFIG_OF` option is handled within the kernel build system. The logical place to start is the `drivers/of/Kconfig` file. That's the standard location for device tree-related configuration options. By examining that Kconfig file, I can see how `CONFIG_OF` is defined, what dependencies it has, and perhaps understand the overall rationale behind its inclusion or exclusion in the kernel build. This will give me a solid foundation for understanding the device tree configuration process.

{
  "File": "drivers/of/Kconfig",
  "FirstLine": 1,
  "LineCount": 40
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0\n   2:\tconfig DTC\n   3:\t\tbool\n   4:\t\n   5:\tconfig GENERIC_BUILTIN_DTB\n   6:\t\tbool\n   7:\t\n   8:\tconfig BUILTIN_DTB_ALL\n   9:\t\tbool\n  10:\t\n  11:\tmenuconfig OF\n  12:\t\tbool \"Device Tree and Open Firmware support\"\n  13:\t\thelp\n  14:\t\t  This option enables the device tree infrastructure.\n  15:\t\t  It is automatically selected by platforms that need it or can\n  16:\t\t  be enabled manually for unittests, overlays or\n  17:\t\t  compile-coverage.\n  18:\t\n  19:\tif OF\n  20:\t\n  21:\tconfig OF_UNITTEST\n  22:\t\tbool \"Device Tree runtime unit tests\"\n  23:\t\tdepends on OF_EARLY_FLATTREE\n  24:\t\tselect IRQ_DOMAIN\n  25:\t\tselect OF_RESOLVE\n  26:\t\thelp\n  27:\t\t  This option builds in test cases for the device tree infrastructure\n  28:\t\t  that are executed once at boot time, and the results dumped to the\n  29:\t\t  console.\n  30:\t\n  31:\t\t  This option should only be enabled for a development kernel. The tests\n  32:\t\t  will taint the kernel with TAINT_TEST. The tests will cause ERROR and\n  33:\t\t  WARNING messages to print on the console. The tests will cause stack\n  34:\t\t  traces to print on the console.  It is possible that the tests will\n  35:\t\t  leave the devicetree in a corrupted state.\n  36:\t\n  37:\t\t  The unittest output will be verbose.  Copy the output to a file\n  38:\t\t  via capturing the console output or via the dmesg command.  Process\n  39:\t\t  this file with scripts/dtc/of_unittest_expect to reduce the\n  40:\t\t  verbosity, test whether expected output is present, and to\n"
}

gemini-3.8-flash

null

null

							input: 28097
							output: 28
							thoughts: 351
						

**My Analysis of the `onie_tlv_layout` Driver**

Okay, so I'm diving into how this `onie_tlv_layout` driver works, specifically focusing on how it integrates with the overall system. The question is, how does it probe and ultimately invoke `onie_tlv_add_cells`, given that `CONFIG_OF` is enabled?

Let's break it down: `onie_tlv_layout` is sitting there, essentially operating as a driver on the `nvmem-layout` bus. Now, the key is the creation of devices on that bus. My quick scan reveals that devices on the `nvmem-layout` bus are *exclusively* brought into existence within `drivers/nvmem/layouts.c`, via this `nvmem_layout_bus_populate` function. That one is called with `nvmem` and `layout_dn`, where `layout_dn` comes from `of_nvmem_layout_get_container(nvmem)`. This, in turn, boils down to `of_get_child_by_name(nvmem->dev.of_node, "nvmem-layout")`.

Ah, so it's all about the device tree. It looks like `nvmem_populate_layout` actually drives this. Where is *that* called? Turns out it's called within `nvmem_register`. This is good, it allows us to track all the dependencies.

So, in essence, an `nvmem` device needs to be registered. This `nvmem` device must have an `of_node` that contains a child node named `"nvmem-layout"`. This child node must have a `compatible` property set to `"onie,tlv-layout"`.

Now, here's a wrinkle: can these `nvmem` devices be dynamically spawned from userspace, perhaps via some kind of emulated hardware? I'm going to have to do a quick survey of all the `nvmem` providers in the kernel tree to make sure I don't miss anything.

{
  "Expression": "nvmem_register",
  "PathPrefix": "drivers/nvmem"
}

{
  "Output": "drivers/nvmem/an8855-efuse.c=26=static int an8855_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/an8855-efuse.c-45-\tan8855_nvmem_config.dev = dev;\ndrivers/nvmem/an8855-efuse.c:46:\tnvmem = devm_nvmem_register(dev, \u0026an8855_nvmem_config);\ndrivers/nvmem/an8855-efuse.c-47-\n--\ndrivers/nvmem/apple-efuses.c=33=static int apple_efuses_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/apple-efuses.c-59-\ndrivers/nvmem/apple-efuses.c:60:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, \u0026config));\ndrivers/nvmem/apple-efuses.c-61-}\n--\ndrivers/nvmem/apple-spmi-nvmem.c=21=static int apple_spmi_nvmem_probe(struct spmi_device *sdev)\n--\ndrivers/nvmem/apple-spmi-nvmem.c-40-\ndrivers/nvmem/apple-spmi-nvmem.c:41:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(\u0026sdev-\u003edev, \u0026nvmem_cfg));\ndrivers/nvmem/apple-spmi-nvmem.c-42-}\n--\ndrivers/nvmem/bcm-ocotp.c=243=static int bcm_otpc_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/bcm-ocotp.c-292-\ndrivers/nvmem/bcm-ocotp.c:293:\tnvmem = devm_nvmem_register(dev, \u0026bcm_otpc_nvmem_config);\ndrivers/nvmem/bcm-ocotp.c-294-\tif (IS_ERR(nvmem)) {\n--\ndrivers/nvmem/brcm_nvram.c=204=static int brcm_nvram_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/brcm_nvram.c-232-\ndrivers/nvmem/brcm_nvram.c:233:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(dev, \u0026config));\ndrivers/nvmem/brcm_nvram.c-234-}\n--\ndrivers/nvmem/core.c=678=static int nvmem_add_cells(struct nvmem_device *nvmem,\n--\ndrivers/nvmem/core.c-693-/**\ndrivers/nvmem/core.c:694: * nvmem_register_notifier() - Register a notifier block for nvmem events.\ndrivers/nvmem/core.c-695- *\n--\ndrivers/nvmem/core.c-699- */\ndrivers/nvmem/core.c:700:int nvmem_register_notifier(struct notifier_block *nb)\ndrivers/nvmem/core.c-701-{\n--\ndrivers/nvmem/core.c-703-}\ndrivers/nvmem/core.c:704:EXPORT_SYMBOL_GPL(nvmem_register_notifier);\ndrivers/nvmem/core.c-705-\n--\ndrivers/nvmem/core.c=888=EXPORT_SYMBOL_GPL(nvmem_layout_unregister);\n--\ndrivers/nvmem/core.c-890-/**\ndrivers/nvmem/core.c:891: * nvmem_register() - Register a nvmem device for given nvmem_config.\ndrivers/nvmem/core.c-892- * Also creates a binary entry in /sys/bus/nvmem/devices/dev-name/nvmem\n--\ndrivers/nvmem/core.c-899-\ndrivers/nvmem/core.c:900:struct nvmem_device *nvmem_register(const struct nvmem_config *config)\ndrivers/nvmem/core.c-901-{\n--\ndrivers/nvmem/core.c-1046-}\ndrivers/nvmem/core.c:1047:EXPORT_SYMBOL_GPL(nvmem_register);\ndrivers/nvmem/core.c-1048-\n--\ndrivers/nvmem/core.c=1077=static void devm_nvmem_unregister(void *nvmem)\n--\ndrivers/nvmem/core.c-1082-/**\ndrivers/nvmem/core.c:1083: * devm_nvmem_register() - Register a managed nvmem device for given\ndrivers/nvmem/core.c-1084- * nvmem_config.\n--\ndrivers/nvmem/core.c-1092- */\ndrivers/nvmem/core.c:1093:struct nvmem_device *devm_nvmem_register(struct device *dev,\ndrivers/nvmem/core.c-1094-\t\t\t\t\t const struct nvmem_config *config)\n--\ndrivers/nvmem/core.c-1098-\ndrivers/nvmem/core.c:1099:\tnvmem = nvmem_register(config);\ndrivers/nvmem/core.c-1100-\tif (IS_ERR(nvmem))\n--\ndrivers/nvmem/core.c-1108-}\ndrivers/nvmem/core.c:1109:EXPORT_SYMBOL_GPL(devm_nvmem_register);\ndrivers/nvmem/core.c-1110-\n--\ndrivers/nvmem/imx-iim.c=96=static int imx_iim_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/imx-iim.c-126-\ndrivers/nvmem/imx-iim.c:127:\tnvmem = devm_nvmem_register(dev, \u0026cfg);\ndrivers/nvmem/imx-iim.c-128-\n--\ndrivers/nvmem/imx-ocotp-ele.c=138=static int imx_ele_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/imx-ocotp-ele.c-167-\ndrivers/nvmem/imx-ocotp-ele.c:168:\tnvmem = devm_nvmem_register(dev, \u0026priv-\u003econfig);\ndrivers/nvmem/imx-ocotp-ele.c-169-\tif (IS_ERR(nvmem))\n--\ndrivers/nvmem/imx-ocotp-scu.c=239=static int imx_scu_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/imx-ocotp-scu.c-258-\timx_scu_ocotp_nvmem_config.priv = priv;\ndrivers/nvmem/imx-ocotp-scu.c:259:\tnvmem = devm_nvmem_register(dev, \u0026imx_scu_ocotp_nvmem_config);\ndrivers/nvmem/imx-ocotp-scu.c-260-\n--\ndrivers/nvmem/imx-ocotp.c=596=static int imx_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/imx-ocotp.c-628-\ndrivers/nvmem/imx-ocotp.c:629:\tnvmem = devm_nvmem_register(dev, \u0026imx_ocotp_nvmem_config);\ndrivers/nvmem/imx-ocotp.c-630-\n--\ndrivers/nvmem/jz4780-efuse.c=139=static int jz4780_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/jz4780-efuse.c-212-\ndrivers/nvmem/jz4780-efuse.c:213:\tnvmem = devm_nvmem_register(dev, \u0026cfg);\ndrivers/nvmem/jz4780-efuse.c-214-\n--\ndrivers/nvmem/lan9662-otpc.c=182=static int lan9662_otp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/lan9662-otpc.c-199-\ndrivers/nvmem/lan9662-otpc.c:200:\tnvmem = devm_nvmem_register(dev, \u0026otp_config);\ndrivers/nvmem/lan9662-otpc.c-201-\n--\ndrivers/nvmem/layerscape-sfp.c=46=static int layerscape_sfp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/layerscape-sfp.c-75-\ndrivers/nvmem/layerscape-sfp.c:76:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026layerscape_sfp_nvmem_config);\ndrivers/nvmem/layerscape-sfp.c-77-\n--\ndrivers/nvmem/lpc18xx_eeprom.c=162=static int lpc18xx_eeprom_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/lpc18xx_eeprom.c-235-\ndrivers/nvmem/lpc18xx_eeprom.c:236:\teeprom-\u003envmem = devm_nvmem_register(dev, \u0026lpc18xx_nvmem_config);\ndrivers/nvmem/lpc18xx_eeprom.c-237-\tif (IS_ERR(eeprom-\u003envmem)) {\n--\ndrivers/nvmem/lpc18xx_otp.c=66=static int lpc18xx_otp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/lpc18xx_otp.c-82-\ndrivers/nvmem/lpc18xx_otp.c:83:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026lpc18xx_otp_nvmem_config);\ndrivers/nvmem/lpc18xx_otp.c-84-\n--\ndrivers/nvmem/max77759-nvmem.c=91=static int max77759_nvmem_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/max77759-nvmem.c-115-\ndrivers/nvmem/max77759-nvmem.c:116:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, \u0026config));\ndrivers/nvmem/max77759-nvmem.c-117-}\n--\ndrivers/nvmem/meson-efuse.c=47=static int meson_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/meson-efuse.c-89-\ndrivers/nvmem/meson-efuse.c:90:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, econfig);\ndrivers/nvmem/meson-efuse.c-91-\n--\ndrivers/nvmem/meson-mx-efuse.c=191=static int meson_mx_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/meson-mx-efuse.c-225-\ndrivers/nvmem/meson-mx-efuse.c:226:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026efuse-\u003econfig);\ndrivers/nvmem/meson-mx-efuse.c-227-\n--\ndrivers/nvmem/microchip-otpc.c=243=static int mchp_otpc_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/microchip-otpc.c-266-\tmchp_nvmem_config.priv = otpc;\ndrivers/nvmem/microchip-otpc.c:267:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026mchp_nvmem_config);\ndrivers/nvmem/microchip-otpc.c-268-\n--\ndrivers/nvmem/mtk-efuse.c=63=static int mtk_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/mtk-efuse.c-90-\t\teconfig.fixup_dt_cell_info = \u0026mtk_efuse_fixup_dt_cell_info;\ndrivers/nvmem/mtk-efuse.c:91:\tnvmem = devm_nvmem_register(dev, \u0026econfig);\ndrivers/nvmem/mtk-efuse.c-92-\tif (IS_ERR(nvmem))\n--\ndrivers/nvmem/mxs-ocotp.c=139=static int mxs_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/mxs-ocotp.c-174-\tocotp_config.dev = dev;\ndrivers/nvmem/mxs-ocotp.c:175:\totp-\u003envmem = devm_nvmem_register(dev, \u0026ocotp_config);\ndrivers/nvmem/mxs-ocotp.c-176-\tif (IS_ERR(otp-\u003envmem))\n--\ndrivers/nvmem/nintendo-otp.c=74=static int nintendo_otp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/nintendo-otp.c-106-\ndrivers/nvmem/nintendo-otp.c:107:\tnvmem = devm_nvmem_register(dev, \u0026config);\ndrivers/nvmem/nintendo-otp.c-108-\n--\ndrivers/nvmem/qcom-spmi-sdam.c=111=static int sdam_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/qcom-spmi-sdam.c-152-\ndrivers/nvmem/qcom-spmi-sdam.c:153:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026sdam-\u003esdam_config);\ndrivers/nvmem/qcom-spmi-sdam.c-154-\tif (IS_ERR(nvmem)) {\n--\ndrivers/nvmem/qfprom.c=369=static int qfprom_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/qfprom.c-454-\ndrivers/nvmem/qfprom.c:455:\tnvmem = devm_nvmem_register(dev, \u0026econfig);\ndrivers/nvmem/qfprom.c-456-\n--\ndrivers/nvmem/qnap-mcu-eeprom.c=74=static int qnap_mcu_eeprom_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/qnap-mcu-eeprom.c-93-\ndrivers/nvmem/qnap-mcu-eeprom.c:94:\tndev = devm_nvmem_register(\u0026pdev-\u003edev, \u0026nvcfg);\ndrivers/nvmem/qnap-mcu-eeprom.c-95-\tif (IS_ERR(ndev))\n--\ndrivers/nvmem/qoriq-efuse.c=30=static int qoriq_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/qoriq-efuse.c-55-\tconfig.priv = priv;\ndrivers/nvmem/qoriq-efuse.c:56:\tnvmem = devm_nvmem_register(config.dev, \u0026config);\ndrivers/nvmem/qoriq-efuse.c-57-\n--\ndrivers/nvmem/rave-sp-eeprom.c=287=static int rave_sp_eeprom_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/rave-sp-eeprom.c-337-\ndrivers/nvmem/rave-sp-eeprom.c:338:\tnvmem = devm_nvmem_register(dev, \u0026config);\ndrivers/nvmem/rave-sp-eeprom.c-339-\n--\ndrivers/nvmem/rcar-efuse.c=47=static int rcar_fuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/rcar-efuse.c-90-\ndrivers/nvmem/rcar-efuse.c:91:\tfuse-\u003envmem = devm_nvmem_register(dev, \u0026config);\ndrivers/nvmem/rcar-efuse.c-92-\tif (IS_ERR(fuse-\u003envmem))\n--\ndrivers/nvmem/rmem.c=119=static int rmem_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/rmem.c-152-\ndrivers/nvmem/rmem.c:153:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(dev, \u0026config));\ndrivers/nvmem/rmem.c-154-}\n--\ndrivers/nvmem/rockchip-efuse.c=253=static int rockchip_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/rockchip-efuse.c-286-\teconfig.dev = efuse-\u003edev;\ndrivers/nvmem/rockchip-efuse.c:287:\tnvmem = devm_nvmem_register(dev, \u0026econfig);\ndrivers/nvmem/rockchip-efuse.c-288-\n--\ndrivers/nvmem/rockchip-otp.c=415=static int rockchip_otp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/rockchip-otp.c-459-\ndrivers/nvmem/rockchip-otp.c:460:\tnvmem = devm_nvmem_register(dev, \u0026otp_config);\ndrivers/nvmem/rockchip-otp.c-461-\tif (IS_ERR(nvmem))\n--\ndrivers/nvmem/s32g-ocotp-nvmem.c=64=static int s32g_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/s32g-ocotp-nvmem.c-84-\ndrivers/nvmem/s32g-ocotp-nvmem.c:85:\tnvmem = devm_nvmem_register(dev, \u0026s32g_ocotp_nvmem_config);\ndrivers/nvmem/s32g-ocotp-nvmem.c-86-\n--\ndrivers/nvmem/sc27xx-efuse.c=202=static int sc27xx_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/sc27xx-efuse.c-250-\teconfig.add_legacy_fixed_of_cells = true;\ndrivers/nvmem/sc27xx-efuse.c:251:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026econfig);\ndrivers/nvmem/sc27xx-efuse.c-252-\tif (IS_ERR(nvmem)) {\n--\ndrivers/nvmem/sec-qfprom.c=46=static int sec_qfprom_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/sec-qfprom.c-76-\ndrivers/nvmem/sec-qfprom.c:77:\tnvmem = devm_nvmem_register(dev, \u0026econfig);\ndrivers/nvmem/sec-qfprom.c-78-\n--\ndrivers/nvmem/snvs_lpgpr.c=89=static int snvs_lpgpr_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/snvs_lpgpr.c-131-\ndrivers/nvmem/snvs_lpgpr.c:132:\tnvmem = devm_nvmem_register(dev, cfg);\ndrivers/nvmem/snvs_lpgpr.c-133-\n--\ndrivers/nvmem/sprd-efuse.c=361=static int sprd_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/sprd-efuse.c-415-\teconfig.dev = \u0026pdev-\u003edev;\ndrivers/nvmem/sprd-efuse.c:416:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026econfig);\ndrivers/nvmem/sprd-efuse.c-417-\tif (IS_ERR(nvmem)) {\n--\ndrivers/nvmem/stm32-romem.c=189=static int stm32_romem_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/stm32-romem.c-248-\ndrivers/nvmem/stm32-romem.c:249:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(dev, \u0026priv-\u003ecfg));\ndrivers/nvmem/stm32-romem.c-250-}\n--\ndrivers/nvmem/sunplus-ocotp.c=157=static int sp_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/sunplus-ocotp.c-191-\ndrivers/nvmem/sunplus-ocotp.c:192:\tnvmem = devm_nvmem_register(dev, \u0026sp_ocotp_nvmem_config);\ndrivers/nvmem/sunplus-ocotp.c-193-\tif (IS_ERR(nvmem)) {\n--\ndrivers/nvmem/sunxi_sid.c=124=static int sunxi_sid_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/sunxi_sid.c-166-\ndrivers/nvmem/sunxi_sid.c:167:\tnvmem = devm_nvmem_register(dev, nvmem_cfg);\ndrivers/nvmem/sunxi_sid.c-168-\tif (IS_ERR(nvmem))\n--\ndrivers/nvmem/u-boot-env.c=46=static int u_boot_env_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/u-boot-env.c-72-\ndrivers/nvmem/u-boot-env.c:73:\tpriv-\u003envmem = devm_nvmem_register(dev, \u0026config);\ndrivers/nvmem/u-boot-env.c-74-\tif (IS_ERR(priv-\u003envmem))\n--\ndrivers/nvmem/uniphier-efuse.c=32=static int uniphier_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/uniphier-efuse.c-55-\teconfig.add_legacy_fixed_of_cells = true;\ndrivers/nvmem/uniphier-efuse.c:56:\tnvmem = devm_nvmem_register(dev, \u0026econfig);\ndrivers/nvmem/uniphier-efuse.c-57-\n--\ndrivers/nvmem/vf610-ocotp.c=212=static int vf610_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/vf610-ocotp.c-238-\ndrivers/nvmem/vf610-ocotp.c:239:\tocotp_dev-\u003envmem = devm_nvmem_register(dev, \u0026ocotp_config);\ndrivers/nvmem/vf610-ocotp.c-240-\n--\ndrivers/nvmem/zynqmp_nvmem.c=206=static int zynqmp_nvmem_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/zynqmp_nvmem.c-220-\ndrivers/nvmem/zynqmp_nvmem.c:221:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(dev, \u0026econfig));\ndrivers/nvmem/zynqmp_nvmem.c-222-}\n"
}

gemini-3.8-flash

null

null

							input: 35003
							output: 27
							thoughts: 99
						

**My Initial Assessment of Non-Volatile Memory Implementations**

Okay, first glance, and it seems like the vast majority of these are focused on System-on-Chip (SoC) specific e-fuses and One-Time Programmable (OTP) controllers. I'm seeing a lot of familiar names pop up: sunxi, zynqmp, vf610, mtk, rockchip, Apple, Meson, BCM, QCOM... the usual suspects. But, hold on a second. This feels incomplete. Where are the more generic, traditional non-volatile memory technologies like EEPROMs and MTD devices? Things like at24, at25, and the broader mtd framework? It's not adding up. I need a more complete picture, so I'll need to explore a bit deeper to see if these have all been documented here. Let me search through the driver directory for nvmem_register to see what pops up. This should give a much better overview.

{
  "Expression": "nvmem_register\\(",
  "PathPrefix": "drivers/"
}

{
  "Output": "\nFull output is too long, showing 500 out of 651 lines.\nUse more precise expression if possible.\n\ndrivers/hwmon/pmbus/adm1266.c=421=static int adm1266_config_nvmem(struct adm1266_data *data)\n--\ndrivers/hwmon/pmbus/adm1266.c-439-\ndrivers/hwmon/pmbus/adm1266.c:440:\tdata-\u003envmem = devm_nvmem_register(\u0026data-\u003eclient-\u003edev, \u0026data-\u003envmem_config);\ndrivers/hwmon/pmbus/adm1266.c-441-\tif (IS_ERR(data-\u003envmem)) {\n--\ndrivers/hwmon/spd5118.c=392=static int spd5118_nvmem_init(struct device *dev, struct spd5118_data *data)\n--\ndrivers/hwmon/spd5118.c-411-\ndrivers/hwmon/spd5118.c:412:\tnvmem = devm_nvmem_register(dev, \u0026nvmem_config);\ndrivers/hwmon/spd5118.c-413-\treturn PTR_ERR_OR_ZERO(nvmem);\n--\ndrivers/iio/pressure/bmp280-core.c=2338=static int bmp580_preinit(struct bmp280_data *data)\n--\ndrivers/iio/pressure/bmp280-core.c-2381-\t/* Register nvmem device */\ndrivers/iio/pressure/bmp280-core.c:2382:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, \u0026config));\ndrivers/iio/pressure/bmp280-core.c-2383-}\n--\ndrivers/media/i2c/ov2740.c=1244=static int ov2740_register_nvmem(struct i2c_client *client,\n--\ndrivers/media/i2c/ov2740.c-1279-\ndrivers/media/i2c/ov2740.c:1280:\tnvm-\u003envmem = devm_nvmem_register(dev, \u0026nvmem_config);\ndrivers/media/i2c/ov2740.c-1281-\tif (IS_ERR(nvm-\u003envmem))\n--\ndrivers/media/i2c/video-i2c.c=746=static int video_i2c_probe(struct i2c_client *client)\n--\ndrivers/media/i2c/video-i2c.c-840-\ndrivers/media/i2c/video-i2c.c:841:\t\tdevice = devm_nvmem_register(\u0026client-\u003edev, config);\ndrivers/media/i2c/video-i2c.c-842-\n--\ndrivers/misc/ds1682.c=226=static int ds1682_probe(struct i2c_client *client)\n--\ndrivers/misc/ds1682.c-246-\ndrivers/misc/ds1682.c:247:\tnvmem = devm_nvmem_register(\u0026client-\u003edev, \u0026config);\ndrivers/misc/ds1682.c-248-\tif (IS_ENABLED(CONFIG_NVMEM) \u0026\u0026 IS_ERR(nvmem))\n--\ndrivers/misc/eeprom/at24.c=596=static int at24_probe(struct i2c_client *client)\n--\ndrivers/misc/eeprom/at24.c-779-\ndrivers/misc/eeprom/at24.c:780:\tat24-\u003envmem = devm_nvmem_register(dev, \u0026nvmem_config);\ndrivers/misc/eeprom/at24.c-781-\tif (IS_ERR(at24-\u003envmem)) {\n--\ndrivers/misc/eeprom/at25.c=482=static int at25_probe(struct spi_mem *mem)\n--\ndrivers/misc/eeprom/at25.c-552-\ndrivers/misc/eeprom/at25.c:553:\tat25-\u003envmem = devm_nvmem_register(\u0026spi-\u003edev, \u0026at25-\u003envmem_config);\ndrivers/misc/eeprom/at25.c-554-\tif (IS_ERR(at25-\u003envmem))\n--\ndrivers/misc/eeprom/ee1004.c=279=static int ee1004_probe(struct i2c_client *client)\n--\ndrivers/misc/eeprom/ee1004.c-327-\ndrivers/misc/eeprom/ee1004.c:328:\tndev = devm_nvmem_register(\u0026client-\u003edev, \u0026config);\ndrivers/misc/eeprom/ee1004.c-329-\tif (IS_ERR(ndev))\n--\ndrivers/misc/eeprom/eeprom_93xx46.c=459=static int eeprom_93xx46_probe(struct spi_device *spi)\n--\ndrivers/misc/eeprom/eeprom_93xx46.c-519-\ndrivers/misc/eeprom/eeprom_93xx46.c:520:\tedev-\u003envmem = devm_nvmem_register(\u0026spi-\u003edev, \u0026edev-\u003envmem_config);\ndrivers/misc/eeprom/eeprom_93xx46.c-521-\tif (IS_ERR(edev-\u003envmem))\n--\ndrivers/misc/eeprom/m24lr.c=488=static int m24lr_probe(struct i2c_client *client)\n--\ndrivers/misc/eeprom/m24lr.c-556-\ndrivers/misc/eeprom/m24lr.c:557:\tnvmem = devm_nvmem_register(dev, \u0026nvmem_conf);\ndrivers/misc/eeprom/m24lr.c-558-\tif (IS_ERR(nvmem))\n--\ndrivers/misc/keba/cp500.c=593=static int cp500_nvmem_write(void *priv, unsigned int offset, void *val,\n--\ndrivers/misc/keba/cp500.c-606-\ndrivers/misc/keba/cp500.c:607:static int cp500_nvmem_register(struct cp500 *cp500,\ndrivers/misc/keba/cp500.c-608-\t\t\t\tstruct nvmem_device *base_nvmem)\n--\ndrivers/misc/keba/cp500.c-634-\tnvmem_config.priv = \u0026cp500-\u003envmem_cpu;\ndrivers/misc/keba/cp500.c:635:\ttmp = nvmem_register(\u0026nvmem_config);\ndrivers/misc/keba/cp500.c-636-\tif (IS_ERR(tmp))\n--\ndrivers/misc/keba/cp500.c-644-\tnvmem_config.priv = \u0026cp500-\u003envmem_user;\ndrivers/misc/keba/cp500.c:645:\ttmp = nvmem_register(\u0026nvmem_config);\ndrivers/misc/keba/cp500.c-646-\tif (IS_ERR(tmp)) {\n--\ndrivers/misc/keba/cp500.c=693=static int cp500_nvmem(struct notifier_block *nb, unsigned long action,\n--\ndrivers/misc/keba/cp500.c-720-\ndrivers/misc/keba/cp500.c:721:\tret = cp500_nvmem_register(cp500, nvmem);\ndrivers/misc/keba/cp500.c-722-\tif (ret)\n--\ndrivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_otpe2p.c=320=static int pci1xxxx_otp_eeprom_probe(struct auxiliary_device *aux_dev,\n--\ndrivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_otpe2p.c-376-\ndrivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_otpe2p.c:377:\t\tpriv-\u003envmem_eeprom = devm_nvmem_register(\u0026aux_dev-\u003edev,\ndrivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_otpe2p.c-378-\t\t\t\t\t\t\t \u0026priv-\u003envmem_config_eeprom);\n--\ndrivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_otpe2p.c-396-\ndrivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_otpe2p.c:397:\tpriv-\u003envmem_otp = devm_nvmem_register(\u0026aux_dev-\u003edev,\ndrivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_otpe2p.c-398-\t\t\t\t\t      \u0026priv-\u003envmem_config_otp);\n--\ndrivers/mtd/mtdcore.c=598=static int mtd_nvmem_add(struct mtd_info *mtd)\n--\ndrivers/mtd/mtdcore.c-616-\ndrivers/mtd/mtdcore.c:617:\tmtd-\u003envmem = nvmem_register(\u0026config);\ndrivers/mtd/mtdcore.c-618-\tif (IS_ERR(mtd-\u003envmem)) {\n--\ndrivers/mtd/mtdcore.c=908=static ssize_t mtd_otp_size(struct mtd_info *mtd, bool is_user)\n--\ndrivers/mtd/mtdcore.c-939-\ndrivers/mtd/mtdcore.c:940:static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd,\ndrivers/mtd/mtdcore.c-941-\t\t\t\t\t\t   const char *compatible,\n--\ndrivers/mtd/mtdcore.c-965-\ndrivers/mtd/mtdcore.c:966:\tnvmem = nvmem_register(\u0026config);\ndrivers/mtd/mtdcore.c-967-\t/* Just ignore if there is no NVMEM support in the kernel */\n--\ndrivers/mtd/mtdcore.c=1004=static int mtd_otp_nvmem_add(struct mtd_info *mtd)\n--\ndrivers/mtd/mtdcore.c-1018-\t\tif (size \u003e 0) {\ndrivers/mtd/mtdcore.c:1019:\t\t\tnvmem = mtd_otp_nvmem_register(mtd, \"user-otp\", size,\ndrivers/mtd/mtdcore.c-1020-\t\t\t\t\t\t       mtd_nvmem_user_otp_reg_read);\n--\ndrivers/mtd/mtdcore.c-1056-\ndrivers/mtd/mtdcore.c:1057:\t\t\tnvmem = mtd_otp_nvmem_register(mtd, \"factory-otp\", size,\ndrivers/mtd/mtdcore.c-1058-\t\t\t\t\t\t       mtd_nvmem_fact_otp_reg_read);\n--\ndrivers/mtd/ubi/nvmem.c=61=static int ubi_nvmem_add(struct ubi_volume_info *vi)\n--\ndrivers/mtd/ubi/nvmem.c-98-\tunv-\u003eusable_leb_size = vi-\u003eusable_leb_size;\ndrivers/mtd/ubi/nvmem.c:99:\tunv-\u003envmem = nvmem_register(\u0026config);\ndrivers/mtd/ubi/nvmem.c-100-\tif (IS_ERR(unv-\u003envmem)) {\n--\ndrivers/nvmem/an8855-efuse.c=26=static int an8855_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/an8855-efuse.c-45-\tan8855_nvmem_config.dev = dev;\ndrivers/nvmem/an8855-efuse.c:46:\tnvmem = devm_nvmem_register(dev, \u0026an8855_nvmem_config);\ndrivers/nvmem/an8855-efuse.c-47-\n--\ndrivers/nvmem/apple-efuses.c=33=static int apple_efuses_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/apple-efuses.c-59-\ndrivers/nvmem/apple-efuses.c:60:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, \u0026config));\ndrivers/nvmem/apple-efuses.c-61-}\n--\ndrivers/nvmem/apple-spmi-nvmem.c=21=static int apple_spmi_nvmem_probe(struct spmi_device *sdev)\n--\ndrivers/nvmem/apple-spmi-nvmem.c-40-\ndrivers/nvmem/apple-spmi-nvmem.c:41:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(\u0026sdev-\u003edev, \u0026nvmem_cfg));\ndrivers/nvmem/apple-spmi-nvmem.c-42-}\n--\ndrivers/nvmem/bcm-ocotp.c=243=static int bcm_otpc_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/bcm-ocotp.c-292-\ndrivers/nvmem/bcm-ocotp.c:293:\tnvmem = devm_nvmem_register(dev, \u0026bcm_otpc_nvmem_config);\ndrivers/nvmem/bcm-ocotp.c-294-\tif (IS_ERR(nvmem)) {\n--\ndrivers/nvmem/brcm_nvram.c=204=static int brcm_nvram_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/brcm_nvram.c-232-\ndrivers/nvmem/brcm_nvram.c:233:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(dev, \u0026config));\ndrivers/nvmem/brcm_nvram.c-234-}\n--\ndrivers/nvmem/core.c=888=EXPORT_SYMBOL_GPL(nvmem_layout_unregister);\n--\ndrivers/nvmem/core.c-890-/**\ndrivers/nvmem/core.c:891: * nvmem_register() - Register a nvmem device for given nvmem_config.\ndrivers/nvmem/core.c-892- * Also creates a binary entry in /sys/bus/nvmem/devices/dev-name/nvmem\n--\ndrivers/nvmem/core.c-899-\ndrivers/nvmem/core.c:900:struct nvmem_device *nvmem_register(const struct nvmem_config *config)\ndrivers/nvmem/core.c-901-{\n--\ndrivers/nvmem/core.c=1077=static void devm_nvmem_unregister(void *nvmem)\n--\ndrivers/nvmem/core.c-1082-/**\ndrivers/nvmem/core.c:1083: * devm_nvmem_register() - Register a managed nvmem device for given\ndrivers/nvmem/core.c-1084- * nvmem_config.\n--\ndrivers/nvmem/core.c-1092- */\ndrivers/nvmem/core.c:1093:struct nvmem_device *devm_nvmem_register(struct device *dev,\ndrivers/nvmem/core.c-1094-\t\t\t\t\t const struct nvmem_config *config)\n--\ndrivers/nvmem/core.c-1098-\ndrivers/nvmem/core.c:1099:\tnvmem = nvmem_register(config);\ndrivers/nvmem/core.c-1100-\tif (IS_ERR(nvmem))\n--\ndrivers/nvmem/imx-iim.c=96=static int imx_iim_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/imx-iim.c-126-\ndrivers/nvmem/imx-iim.c:127:\tnvmem = devm_nvmem_register(dev, \u0026cfg);\ndrivers/nvmem/imx-iim.c-128-\n--\ndrivers/nvmem/imx-ocotp-ele.c=138=static int imx_ele_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/imx-ocotp-ele.c-167-\ndrivers/nvmem/imx-ocotp-ele.c:168:\tnvmem = devm_nvmem_register(dev, \u0026priv-\u003econfig);\ndrivers/nvmem/imx-ocotp-ele.c-169-\tif (IS_ERR(nvmem))\n--\ndrivers/nvmem/imx-ocotp-scu.c=239=static int imx_scu_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/imx-ocotp-scu.c-258-\timx_scu_ocotp_nvmem_config.priv = priv;\ndrivers/nvmem/imx-ocotp-scu.c:259:\tnvmem = devm_nvmem_register(dev, \u0026imx_scu_ocotp_nvmem_config);\ndrivers/nvmem/imx-ocotp-scu.c-260-\n--\ndrivers/nvmem/imx-ocotp.c=596=static int imx_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/imx-ocotp.c-628-\ndrivers/nvmem/imx-ocotp.c:629:\tnvmem = devm_nvmem_register(dev, \u0026imx_ocotp_nvmem_config);\ndrivers/nvmem/imx-ocotp.c-630-\n--\ndrivers/nvmem/jz4780-efuse.c=139=static int jz4780_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/jz4780-efuse.c-212-\ndrivers/nvmem/jz4780-efuse.c:213:\tnvmem = devm_nvmem_register(dev, \u0026cfg);\ndrivers/nvmem/jz4780-efuse.c-214-\n--\ndrivers/nvmem/lan9662-otpc.c=182=static int lan9662_otp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/lan9662-otpc.c-199-\ndrivers/nvmem/lan9662-otpc.c:200:\tnvmem = devm_nvmem_register(dev, \u0026otp_config);\ndrivers/nvmem/lan9662-otpc.c-201-\n--\ndrivers/nvmem/layerscape-sfp.c=46=static int layerscape_sfp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/layerscape-sfp.c-75-\ndrivers/nvmem/layerscape-sfp.c:76:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026layerscape_sfp_nvmem_config);\ndrivers/nvmem/layerscape-sfp.c-77-\n--\ndrivers/nvmem/lpc18xx_eeprom.c=162=static int lpc18xx_eeprom_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/lpc18xx_eeprom.c-235-\ndrivers/nvmem/lpc18xx_eeprom.c:236:\teeprom-\u003envmem = devm_nvmem_register(dev, \u0026lpc18xx_nvmem_config);\ndrivers/nvmem/lpc18xx_eeprom.c-237-\tif (IS_ERR(eeprom-\u003envmem)) {\n--\ndrivers/nvmem/lpc18xx_otp.c=66=static int lpc18xx_otp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/lpc18xx_otp.c-82-\ndrivers/nvmem/lpc18xx_otp.c:83:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026lpc18xx_otp_nvmem_config);\ndrivers/nvmem/lpc18xx_otp.c-84-\n--\ndrivers/nvmem/max77759-nvmem.c=91=static int max77759_nvmem_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/max77759-nvmem.c-115-\ndrivers/nvmem/max77759-nvmem.c:116:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, \u0026config));\ndrivers/nvmem/max77759-nvmem.c-117-}\n--\ndrivers/nvmem/meson-efuse.c=47=static int meson_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/meson-efuse.c-89-\ndrivers/nvmem/meson-efuse.c:90:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, econfig);\ndrivers/nvmem/meson-efuse.c-91-\n--\ndrivers/nvmem/meson-mx-efuse.c=191=static int meson_mx_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/meson-mx-efuse.c-225-\ndrivers/nvmem/meson-mx-efuse.c:226:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026efuse-\u003econfig);\ndrivers/nvmem/meson-mx-efuse.c-227-\n--\ndrivers/nvmem/microchip-otpc.c=243=static int mchp_otpc_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/microchip-otpc.c-266-\tmchp_nvmem_config.priv = otpc;\ndrivers/nvmem/microchip-otpc.c:267:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026mchp_nvmem_config);\ndrivers/nvmem/microchip-otpc.c-268-\n--\ndrivers/nvmem/mtk-efuse.c=63=static int mtk_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/mtk-efuse.c-90-\t\teconfig.fixup_dt_cell_info = \u0026mtk_efuse_fixup_dt_cell_info;\ndrivers/nvmem/mtk-efuse.c:91:\tnvmem = devm_nvmem_register(dev, \u0026econfig);\ndrivers/nvmem/mtk-efuse.c-92-\tif (IS_ERR(nvmem))\n--\ndrivers/nvmem/mxs-ocotp.c=139=static int mxs_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/mxs-ocotp.c-174-\tocotp_config.dev = dev;\ndrivers/nvmem/mxs-ocotp.c:175:\totp-\u003envmem = devm_nvmem_register(dev, \u0026ocotp_config);\ndrivers/nvmem/mxs-ocotp.c-176-\tif (IS_ERR(otp-\u003envmem))\n--\ndrivers/nvmem/nintendo-otp.c=74=static int nintendo_otp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/nintendo-otp.c-106-\ndrivers/nvmem/nintendo-otp.c:107:\tnvmem = devm_nvmem_register(dev, \u0026config);\ndrivers/nvmem/nintendo-otp.c-108-\n--\ndrivers/nvmem/qcom-spmi-sdam.c=111=static int sdam_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/qcom-spmi-sdam.c-152-\ndrivers/nvmem/qcom-spmi-sdam.c:153:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026sdam-\u003esdam_config);\ndrivers/nvmem/qcom-spmi-sdam.c-154-\tif (IS_ERR(nvmem)) {\n--\ndrivers/nvmem/qfprom.c=369=static int qfprom_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/qfprom.c-454-\ndrivers/nvmem/qfprom.c:455:\tnvmem = devm_nvmem_register(dev, \u0026econfig);\ndrivers/nvmem/qfprom.c-456-\n--\ndrivers/nvmem/qnap-mcu-eeprom.c=74=static int qnap_mcu_eeprom_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/qnap-mcu-eeprom.c-93-\ndrivers/nvmem/qnap-mcu-eeprom.c:94:\tndev = devm_nvmem_register(\u0026pdev-\u003edev, \u0026nvcfg);\ndrivers/nvmem/qnap-mcu-eeprom.c-95-\tif (IS_ERR(ndev))\n--\ndrivers/nvmem/qoriq-efuse.c=30=static int qoriq_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/qoriq-efuse.c-55-\tconfig.priv = priv;\ndrivers/nvmem/qoriq-efuse.c:56:\tnvmem = devm_nvmem_register(config.dev, \u0026config);\ndrivers/nvmem/qoriq-efuse.c-57-\n--\ndrivers/nvmem/rave-sp-eeprom.c=287=static int rave_sp_eeprom_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/rave-sp-eeprom.c-337-\ndrivers/nvmem/rave-sp-eeprom.c:338:\tnvmem = devm_nvmem_register(dev, \u0026config);\ndrivers/nvmem/rave-sp-eeprom.c-339-\n--\ndrivers/nvmem/rcar-efuse.c=47=static int rcar_fuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/rcar-efuse.c-90-\ndrivers/nvmem/rcar-efuse.c:91:\tfuse-\u003envmem = devm_nvmem_register(dev, \u0026config);\ndrivers/nvmem/rcar-efuse.c-92-\tif (IS_ERR(fuse-\u003envmem))\n--\ndrivers/nvmem/rmem.c=119=static int rmem_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/rmem.c-152-\ndrivers/nvmem/rmem.c:153:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(dev, \u0026config));\ndrivers/nvmem/rmem.c-154-}\n--\ndrivers/nvmem/rockchip-efuse.c=253=static int rockchip_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/rockchip-efuse.c-286-\teconfig.dev = efuse-\u003edev;\ndrivers/nvmem/rockchip-efuse.c:287:\tnvmem = devm_nvmem_register(dev, \u0026econfig);\ndrivers/nvmem/rockchip-efuse.c-288-\n--\ndrivers/nvmem/rockchip-otp.c=415=static int rockchip_otp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/rockchip-otp.c-459-\ndrivers/nvmem/rockchip-otp.c:460:\tnvmem = devm_nvmem_register(dev, \u0026otp_config);\ndrivers/nvmem/rockchip-otp.c-461-\tif (IS_ERR(nvmem))\n--\ndrivers/nvmem/s32g-ocotp-nvmem.c=64=static int s32g_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/s32g-ocotp-nvmem.c-84-\ndrivers/nvmem/s32g-ocotp-nvmem.c:85:\tnvmem = devm_nvmem_register(dev, \u0026s32g_ocotp_nvmem_config);\ndrivers/nvmem/s32g-ocotp-nvmem.c-86-\n--\ndrivers/nvmem/sc27xx-efuse.c=202=static int sc27xx_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/sc27xx-efuse.c-250-\teconfig.add_legacy_fixed_of_cells = true;\ndrivers/nvmem/sc27xx-efuse.c:251:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026econfig);\ndrivers/nvmem/sc27xx-efuse.c-252-\tif (IS_ERR(nvmem)) {\n--\ndrivers/nvmem/sec-qfprom.c=46=static int sec_qfprom_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/sec-qfprom.c-76-\ndrivers/nvmem/sec-qfprom.c:77:\tnvmem = devm_nvmem_register(dev, \u0026econfig);\ndrivers/nvmem/sec-qfprom.c-78-\n--\ndrivers/nvmem/snvs_lpgpr.c=89=static int snvs_lpgpr_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/snvs_lpgpr.c-131-\ndrivers/nvmem/snvs_lpgpr.c:132:\tnvmem = devm_nvmem_register(dev, cfg);\ndrivers/nvmem/snvs_lpgpr.c-133-\n--\ndrivers/nvmem/sprd-efuse.c=361=static int sprd_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/sprd-efuse.c-415-\teconfig.dev = \u0026pdev-\u003edev;\ndrivers/nvmem/sprd-efuse.c:416:\tnvmem = devm_nvmem_register(\u0026pdev-\u003edev, \u0026econfig);\ndrivers/nvmem/sprd-efuse.c-417-\tif (IS_ERR(nvmem)) {\n--\ndrivers/nvmem/stm32-romem.c=189=static int stm32_romem_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/stm32-romem.c-248-\ndrivers/nvmem/stm32-romem.c:249:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(dev, \u0026priv-\u003ecfg));\ndrivers/nvmem/stm32-romem.c-250-}\n--\ndrivers/nvmem/sunplus-ocotp.c=157=static int sp_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/sunplus-ocotp.c-191-\ndrivers/nvmem/sunplus-ocotp.c:192:\tnvmem = devm_nvmem_register(dev, \u0026sp_ocotp_nvmem_config);\ndrivers/nvmem/sunplus-ocotp.c-193-\tif (IS_ERR(nvmem)) {\n--\ndrivers/nvmem/sunxi_sid.c=124=static int sunxi_sid_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/sunxi_sid.c-166-\ndrivers/nvmem/sunxi_sid.c:167:\tnvmem = devm_nvmem_register(dev, nvmem_cfg);\ndrivers/nvmem/sunxi_sid.c-168-\tif (IS_ERR(nvmem))\n--\ndrivers/nvmem/u-boot-env.c=46=static int u_boot_env_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/u-boot-env.c-72-\ndrivers/nvmem/u-boot-env.c:73:\tpriv-\u003envmem = devm_nvmem_register(dev, \u0026config);\ndrivers/nvmem/u-boot-env.c-74-\tif (IS_ERR(priv-\u003envmem))\n--\ndrivers/nvmem/uniphier-efuse.c=32=static int uniphier_efuse_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/uniphier-efuse.c-55-\teconfig.add_legacy_fixed_of_cells = true;\ndrivers/nvmem/uniphier-efuse.c:56:\tnvmem = devm_nvmem_register(dev, \u0026econfig);\ndrivers/nvmem/uniphier-efuse.c-57-\n--\ndrivers/nvmem/vf610-ocotp.c=212=static int vf610_ocotp_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/vf610-ocotp.c-238-\ndrivers/nvmem/vf610-ocotp.c:239:\tocotp_dev-\u003envmem = devm_nvmem_register(dev, \u0026ocotp_config);\ndrivers/nvmem/vf610-ocotp.c-240-\n--\ndrivers/nvmem/zynqmp_nvmem.c=206=static int zynqmp_nvmem_probe(struct platform_device *pdev)\n--\ndrivers/nvmem/zynqmp_nvmem.c-220-\ndrivers/nvmem/zynqmp_nvmem.c:221:\treturn PTR_ERR_OR_ZERO(devm_nvmem_register(dev, \u0026econfig));\ndrivers/nvmem/zynqmp_nvmem.c-222-}\n--\ndrivers/pmdomain/mediatek/mtk-mfg-pmdomain.c=895=static int mtk_mfg_init_nvmem_provider(struct mtk_mfg *mfg)\n--\ndrivers/pmdomain/mediatek/mtk-mfg-pmdomain.c-909-\ndrivers/pmdomain/mediatek/mtk-mfg-pmdomain.c:910:\tnvdev = devm_nvmem_register(dev, \u0026config);\ndrivers/pmdomain/mediatek/mtk-mfg-pmdomain.c-911-\tif (IS_ERR(nvdev))\n--\ndrivers/power/supply/max1720x_battery.c=514=static int max1720x_probe_nvmem(struct i2c_client *client,\n--\ndrivers/power/supply/max1720x_battery.c-565-\ndrivers/power/supply/max1720x_battery.c:566:\tnvmem = devm_nvmem_register(dev, \u0026nvmem_config);\ndrivers/power/supply/max1720x_battery.c-567-\tif (IS_ERR(nvmem)) {\n--\ndrivers/rtc/nvmem.c-12-\ndrivers/rtc/nvmem.c:13:int devm_rtc_nvmem_register(struct rtc_device *rtc,\ndrivers/rtc/nvmem.c-14-\t\t       struct nvmem_config *nvmem_config)\n--\ndrivers/rtc/nvmem.c-24-\tnvmem_config-\u003eadd_legacy_fixed_of_cells = true;\ndrivers/rtc/nvmem.c:25:\tnvmem = devm_nvmem_register(dev, nvmem_config);\ndrivers/rtc/nvmem.c-26-\tif (IS_ERR(nvmem))\n--\ndrivers/rtc/rtc-abx80x.c=741=static int abx80x_setup_nvmem(struct abx80x_priv *priv)\n--\ndrivers/rtc/rtc-abx80x.c-750-\ndrivers/rtc/rtc-abx80x.c:751:\treturn devm_rtc_nvmem_register(priv-\u003ertc, \u0026config);\ndrivers/rtc/rtc-abx80x.c-752-}\n--\ndrivers/rtc/rtc-cmos.c=930=cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)\n--\ndrivers/rtc/rtc-cmos.c-1118-\tnvmem_cfg.size = address_space - NVRAM_OFFSET;\ndrivers/rtc/rtc-cmos.c:1119:\tdevm_rtc_nvmem_register(cmos_rtc.rtc, \u0026nvmem_cfg);\ndrivers/rtc/rtc-cmos.c-1120-\n--\ndrivers/rtc/rtc-ds1305.c=543=static int ds1305_probe(struct spi_device *spi)\n--\ndrivers/rtc/rtc-ds1305.c-700-\ndrivers/rtc/rtc-ds1305.c:701:\tdevm_rtc_nvmem_register(ds1305-\u003ertc, \u0026ds1305_nvmem_cfg);\ndrivers/rtc/rtc-ds1305.c-702-\n--\ndrivers/rtc/rtc-ds1307.c=1736=static int ds1307_probe(struct i2c_client *client)\n--\ndrivers/rtc/rtc-ds1307.c-2012-\ndrivers/rtc/rtc-ds1307.c:2013:\t\tdevm_rtc_nvmem_register(ds1307-\u003ertc, \u0026nvmem_cfg);\ndrivers/rtc/rtc-ds1307.c-2014-\t}\n--\ndrivers/rtc/rtc-ds1343.c=344=static int ds1343_probe(struct spi_device *spi)\n--\ndrivers/rtc/rtc-ds1343.c-415-\tnvmem_cfg.priv = priv;\ndrivers/rtc/rtc-ds1343.c:416:\tdevm_rtc_nvmem_register(priv-\u003ertc, \u0026nvmem_cfg);\ndrivers/rtc/rtc-ds1343.c-417-\n--\ndrivers/rtc/rtc-ds1511.c=272=static int ds1511_rtc_probe(struct platform_device *pdev)\n--\ndrivers/rtc/rtc-ds1511.c-348-\ndrivers/rtc/rtc-ds1511.c:349:\tdevm_rtc_nvmem_register(ds1511-\u003ertc, \u0026ds1511_nvmem_cfg);\ndrivers/rtc/rtc-ds1511.c-350-\n--\ndrivers/rtc/rtc-ds1553.c=250=static int ds1553_rtc_probe(struct platform_device *pdev)\n--\ndrivers/rtc/rtc-ds1553.c-311-\ndrivers/rtc/rtc-ds1553.c:312:\tdevm_rtc_nvmem_register(pdata-\u003ertc, \u0026nvmem_cfg);\ndrivers/rtc/rtc-ds1553.c-313-\n--\ndrivers/rtc/rtc-ds1685.c=1068=ds1685_rtc_probe(struct platform_device *pdev)\n--\ndrivers/rtc/rtc-ds1685.c-1310-\tnvmem_cfg.priv = rtc;\ndrivers/rtc/rtc-ds1685.c:1311:\tret = devm_rtc_nvmem_register(rtc_dev, \u0026nvmem_cfg);\ndrivers/rtc/rtc-ds1685.c-1312-\tif (ret)\n--\ndrivers/rtc/rtc-ds1742.c=141=static int ds1742_rtc_probe(struct platform_device *pdev)\n--\ndrivers/rtc/rtc-ds1742.c-195-\ndrivers/rtc/rtc-ds1742.c:196:\tdevm_rtc_nvmem_register(rtc, \u0026nvmem_cfg);\ndrivers/rtc/rtc-ds1742.c-197-\n--\ndrivers/rtc/rtc-ds3232.c=461=static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq,\n--\ndrivers/rtc/rtc-ds3232.c-499-\ndrivers/rtc/rtc-ds3232.c:500:\tret = devm_rtc_nvmem_register(ds3232-\u003ertc, \u0026nvmem_cfg);\ndrivers/rtc/rtc-ds3232.c-501-\tif(ret)\n--\ndrivers/rtc/rtc-isl12026.c=431=static int isl12026_probe(struct i2c_client *client)\n--\ndrivers/rtc/rtc-isl12026.c-466-\tnvm_cfg.priv = priv;\ndrivers/rtc/rtc-isl12026.c:467:\tret = devm_rtc_nvmem_register(priv-\u003ertc, \u0026nvm_cfg);\ndrivers/rtc/rtc-isl12026.c-468-\tif (ret)\n--\ndrivers/rtc/rtc-isl1208.c=856=isl1208_probe(struct i2c_client *client)\n--\ndrivers/rtc/rtc-isl1208.c-967-\ndrivers/rtc/rtc-isl1208.c:968:\trc = devm_rtc_nvmem_register(isl1208-\u003ertc, \u0026isl1208-\u003envmem_config);\ndrivers/rtc/rtc-isl1208.c-969-\tif (rc)\n--\ndrivers/rtc/rtc-m48t59.c=340=static int m48t59_rtc_probe(struct platform_device *pdev)\n--\ndrivers/rtc/rtc-m48t59.c-446-\tnvmem_cfg.size = pdata-\u003eoffset;\ndrivers/rtc/rtc-m48t59.c:447:\tret = devm_rtc_nvmem_register(m48t59-\u003ertc, \u0026nvmem_cfg);\n\n"
}

gemini-3.8-flash

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							input: 46243
							output: 31
							thoughts: 649
						

**My Assessment of ONIE TLV Reachability for Fuzzing**

Okay, let's break this down. My goal here is to determine if I should bother trying to fuzz code related to ONIE TLV on an `amd64` platform within a standard virtualized environment like QEMU or GCE. This is crucial; fuzzing unreachable code is a waste of time.

First, I see that `onie-tlv.c` is all about handling hardware identification data, like MAC addresses and serial numbers, stored in an EEPROM on Open Compute Project network switches. This data is structured using the ONIE TLV format. I understand the device tree aspect: there's an `nvmem-layout` node, and the driver probes, registers, matches, and parses the ONIE TLV data.

Now, the core question is: can this code, specifically `onie_tlv_add_cells` or any part of `onie-tlv.c`, actually *execute* on `amd64` in a QEMU or GCE environment?

The instructions are clear: reachability is the primary gate. If the code is structurally unreachable, forget it. That's rule #1. I need to be sure it's not a case of unreachable hardware.

Here's the problem: this EEPROM and the device tree specifically. The instructions mention unreachable hardware, like vendor-specific PCIe devices or drivers requiring physical hardware not emulated in standard QEMU. This makes me consider if the ONIE TLV code fits that category.

So, how does `amd64` boot? My expert knowledge tells me that `amd64` systems boot with ACPI or raw BIOS/EFI, not Open Firmware (OF) or a device tree directly. This is a crucial distinction. The ONIE TLV structure is tied to device trees, and device trees seem to be the mechanism by which the EEPROM is accessed. This, I know, is used on other architectures like RISC-V, but... not x86.

However, I need to check if `CONFIG_OF` can be enabled on x86. I need to see if there's any scenario, any configuration, where an x86 system could actually utilize a device tree like the one needed to trigger this code path. I need to check the x86 defconfig and other relevant config files. If `CONFIG_OF` *is* enabled for x86, it might change things, but I'm not optimistic.

Essentially, I think this code is unlikely to execute on the target architecture/emulation, so it's probably not worth fuzzing.

no matches

{
  "Expression": "CONFIG_OF=",
  "PathPrefix": "arch/x86/configs"
}

{
  "error": "no matches"
}

gemini-3.8-flash

null

null

							input: 47498
							output: 18
							thoughts: 639
						

**My Investigation into `onie,tlv-layout` and Syzkaller**

Okay, so I'm trying to figure out if there's any realistic way `onie,tlv-layout` could show up in a x86 environment, especially with the use of syzkaller. First, I checked `arch/x86/configs`, nothing there. Then, I remembered `CONFIG_OF` and checked `arch/x86/Kconfig`. It's selected only by `X86_INTEL_CE` and `OLPC`, both obsolete platforms. Not really useful.

But then I thought, what if someone *manually* enables `CONFIG_OF` on x86_64? Would that even matter? Does QEMU, the emulator used with syzkaller, pass a device tree with `onie,tlv-layout`? No, x86 QEMU uses ACPI, not FDT. I need to specifically look at `qemu-system-x86_64` and if it even supports the `-dtb` option? It turns out, some versions *do* have it, but they don't *generate* an nvmem device with that `onie,tlv-layout` node! So that's out.

Wait, what device in QEMU *could* have `onie,tlv-layout`? It's all starting to click now. ONIE is an Open Compute Project switch thing. It's for physical OCP network switch hardware or specific DT-based boards like the RISC-V banana pi. Not the x86 stuff.

Could OF overlays or dynamic DT come in from userspace? Let's look at `CONFIG_OF_CONFIGFS`. Does syzkaller even generate DT overlays? I checked the syzkaller side and it doesn't look like syzkaller creates OF overlays or a mock EEPROM with that ONIE layout.

Okay, let's see if there's *anything* `onie` or `nvmem-layout` related in syzkaller's syzlang descriptions. Then I hit a roadblock. I'm reminded that I can't directly search syzkaller syzlang descriptions or expressions containing 'long syz_' using this tool! I need to use `read-syz-spec` and `syz-grepper` instead, but are those even defined for my tool? I look at the declaration list and, nope, no `syz-grepper`. I'm stuck there.

So now, I'm going to look for any other potential callers or users of `onie_tlv_*` in the kernel. Let's do a good old `grep` across the entire source tree for `onie_tlv`. That's my next step.

{
  "Expression": "onie_tlv"
}

{
  "Output": "drivers/nvmem/layouts/onie-tlv.c-21-\ndrivers/nvmem/layouts/onie-tlv.c:22:struct onie_tlv_hdr {\ndrivers/nvmem/layouts/onie-tlv.c-23-\tu8 id[8];\n--\ndrivers/nvmem/layouts/onie-tlv.c-27-\ndrivers/nvmem/layouts/onie-tlv.c:28:struct onie_tlv {\ndrivers/nvmem/layouts/onie-tlv.c-29-\tu8 type;\n--\ndrivers/nvmem/layouts/onie-tlv.c-32-\ndrivers/nvmem/layouts/onie-tlv.c:33:static const char *onie_tlv_cell_name(u8 type)\ndrivers/nvmem/layouts/onie-tlv.c-34-{\n--\ndrivers/nvmem/layouts/onie-tlv.c-76-\ndrivers/nvmem/layouts/onie-tlv.c:77:static int onie_tlv_mac_read_cb(void *priv, const char *id, int index,\ndrivers/nvmem/layouts/onie-tlv.c-78-\t\t\t\tunsigned int offset, void *buf,\n--\ndrivers/nvmem/layouts/onie-tlv.c-85-\ndrivers/nvmem/layouts/onie-tlv.c:86:static nvmem_cell_post_process_t onie_tlv_read_cb(u8 type, u8 *buf)\ndrivers/nvmem/layouts/onie-tlv.c-87-{\n--\ndrivers/nvmem/layouts/onie-tlv.c-89-\tcase 0x24:\ndrivers/nvmem/layouts/onie-tlv.c:90:\t\treturn \u0026onie_tlv_mac_read_cb;\ndrivers/nvmem/layouts/onie-tlv.c-91-\tdefault:\n--\ndrivers/nvmem/layouts/onie-tlv.c-97-\ndrivers/nvmem/layouts/onie-tlv.c:98:static int onie_tlv_add_cells(struct device *dev, struct nvmem_device *nvmem,\ndrivers/nvmem/layouts/onie-tlv.c-99-\t\t\t      size_t data_len, u8 *data)\n--\ndrivers/nvmem/layouts/onie-tlv.c-102-\tstruct device_node *layout;\ndrivers/nvmem/layouts/onie-tlv.c:103:\tstruct onie_tlv tlv;\ndrivers/nvmem/layouts/onie-tlv.c:104:\tunsigned int hdr_len = sizeof(struct onie_tlv_hdr);\ndrivers/nvmem/layouts/onie-tlv.c-105-\tunsigned int offset = 0;\n--\ndrivers/nvmem/layouts/onie-tlv.c-119-\ndrivers/nvmem/layouts/onie-tlv.c:120:\t\tcell.name = onie_tlv_cell_name(tlv.type);\ndrivers/nvmem/layouts/onie-tlv.c-121-\t\tif (!cell.name)\n--\ndrivers/nvmem/layouts/onie-tlv.c-126-\t\tcell.np = of_get_child_by_name(layout, cell.name);\ndrivers/nvmem/layouts/onie-tlv.c:127:\t\tcell.read_post_process = onie_tlv_read_cb(tlv.type, data + offset + sizeof(tlv));\ndrivers/nvmem/layouts/onie-tlv.c-128-\n--\ndrivers/nvmem/layouts/onie-tlv.c-143-\ndrivers/nvmem/layouts/onie-tlv.c:144:static bool onie_tlv_hdr_is_valid(struct device *dev, struct onie_tlv_hdr *hdr)\ndrivers/nvmem/layouts/onie-tlv.c-145-{\n--\ndrivers/nvmem/layouts/onie-tlv.c-158-\ndrivers/nvmem/layouts/onie-tlv.c:159:static bool onie_tlv_crc_is_valid(struct device *dev, size_t table_len, u8 *table)\ndrivers/nvmem/layouts/onie-tlv.c-160-{\ndrivers/nvmem/layouts/onie-tlv.c:161:\tstruct onie_tlv crc_hdr;\ndrivers/nvmem/layouts/onie-tlv.c-162-\tu32 read_crc, calc_crc;\n--\ndrivers/nvmem/layouts/onie-tlv.c-185-\ndrivers/nvmem/layouts/onie-tlv.c:186:static int onie_tlv_parse_table(struct nvmem_layout *layout)\ndrivers/nvmem/layouts/onie-tlv.c-187-{\n--\ndrivers/nvmem/layouts/onie-tlv.c-189-\tstruct device *dev = \u0026layout-\u003edev;\ndrivers/nvmem/layouts/onie-tlv.c:190:\tstruct onie_tlv_hdr hdr;\ndrivers/nvmem/layouts/onie-tlv.c-191-\tsize_t table_len, data_len, hdr_len;\n--\ndrivers/nvmem/layouts/onie-tlv.c-198-\ndrivers/nvmem/layouts/onie-tlv.c:199:\tif (!onie_tlv_hdr_is_valid(dev, \u0026hdr)) {\ndrivers/nvmem/layouts/onie-tlv.c-200-\t\tdev_err(dev, \"Invalid ONIE TLV header\\n\");\n--\ndrivers/nvmem/layouts/onie-tlv.c-219-\ndrivers/nvmem/layouts/onie-tlv.c:220:\tif (!onie_tlv_crc_is_valid(dev, table_len, table))\ndrivers/nvmem/layouts/onie-tlv.c-221-\t\treturn -EINVAL;\n--\ndrivers/nvmem/layouts/onie-tlv.c-223-\tdata = table + hdr_len;\ndrivers/nvmem/layouts/onie-tlv.c:224:\tret = onie_tlv_add_cells(dev, nvmem, data_len, data);\ndrivers/nvmem/layouts/onie-tlv.c-225-\tif (ret)\n--\ndrivers/nvmem/layouts/onie-tlv.c-230-\ndrivers/nvmem/layouts/onie-tlv.c:231:static int onie_tlv_probe(struct nvmem_layout *layout)\ndrivers/nvmem/layouts/onie-tlv.c-232-{\ndrivers/nvmem/layouts/onie-tlv.c:233:\tlayout-\u003eadd_cells = onie_tlv_parse_table;\ndrivers/nvmem/layouts/onie-tlv.c-234-\n--\ndrivers/nvmem/layouts/onie-tlv.c-237-\ndrivers/nvmem/layouts/onie-tlv.c:238:static void onie_tlv_remove(struct nvmem_layout *layout)\ndrivers/nvmem/layouts/onie-tlv.c-239-{\n--\ndrivers/nvmem/layouts/onie-tlv.c-242-\ndrivers/nvmem/layouts/onie-tlv.c:243:static const struct of_device_id onie_tlv_of_match_table[] = {\ndrivers/nvmem/layouts/onie-tlv.c-244-\t{ .compatible = \"onie,tlv-layout\", },\n--\ndrivers/nvmem/layouts/onie-tlv.c-246-};\ndrivers/nvmem/layouts/onie-tlv.c:247:MODULE_DEVICE_TABLE(of, onie_tlv_of_match_table);\ndrivers/nvmem/layouts/onie-tlv.c-248-\ndrivers/nvmem/layouts/onie-tlv.c:249:static struct nvmem_layout_driver onie_tlv_layout = {\ndrivers/nvmem/layouts/onie-tlv.c-250-\t.driver = {\ndrivers/nvmem/layouts/onie-tlv.c-251-\t\t.name = \"onie-tlv-layout\",\ndrivers/nvmem/layouts/onie-tlv.c:252:\t\t.of_match_table = onie_tlv_of_match_table,\ndrivers/nvmem/layouts/onie-tlv.c-253-\t},\ndrivers/nvmem/layouts/onie-tlv.c:254:\t.probe = onie_tlv_probe,\ndrivers/nvmem/layouts/onie-tlv.c:255:\t.remove = onie_tlv_remove,\ndrivers/nvmem/layouts/onie-tlv.c-256-};\ndrivers/nvmem/layouts/onie-tlv.c:257:module_nvmem_layout_driver(onie_tlv_layout);\ndrivers/nvmem/layouts/onie-tlv.c-258-\n"
}

gemini-3.8-flash

null

null

							input: 51021
							output: 163
							thoughts: 1371
						

**Analysis of `onie-tlv.c` for Fuzzing Viability**

Alright, let's break this down. The patch modifies `drivers/nvmem/layouts/onie-tlv.c`, specifically the `onie_tlv_add_cells()` function.  The change itself is straightforward: it adds a missing `of_node_put()` call to release a reference to a device tree node (`cell.np`) when `nvmem_add_one_cell()` fails.  This seems like a straightforward fix for a resource leak.

However, the key question is whether this code path is *reachable* for fuzzing.  The provided guidelines emphasize that unreachable code shouldn't be fuzzed.  The driver in question, `onie-tlv.c`, is designed for Open Compute Project (OCP) network switches that use ONIE TLV EEPROMs and rely on Open Firmware (OF) / Device Tree (DT) for configuration.

Here's my assessment:

1.  **Architecture:** The target is amd64, which is the system I'm assessing.

2.  **Configuration Dependencies:** `onie-tlv.c` is enabled by `CONFIG_NVMEM_LAYOUT_ONIE_TLV`, which depends on `CONFIG_NVMEM_LAYOUTS`, which in turn depends on `CONFIG_OF`.  On amd64, `CONFIG_OF` is *not* enabled in standard kernel builds.  It's typically only present on obsolete platforms like CE4100 or OLPC (which are 32-bit and unlikely to be the target here) or for unit tests.  This is a significant red flag.

3.  **Hardware Dependency:** Even *if* those configurations are enabled, the driver requires a specific Device Tree node with `compatible = "onie,tlv-layout"` associated with an nvmem device, like an EEPROM on a network switch.

4.  **Virtualized Environment:**  Standard QEMU or Google Compute Engine (GCE) environments on amd64, which are the typical fuzzing environments, *do not* emulate this type of hardware or provide the necessary DT node.  They boot via ACPI/BIOS, not OF/DTS, so there's no way to trigger the ONIE TLV layout parsing.

5.  **Error Path:** Furthermore, the patch is within an *error path*. The added `of_node_put` is only executed if `nvmem_add_one_cell()` fails, indicating an issue during parsing the ONIE TLV data.

6.  **Unreachability:** Therefore, I'm confident that the entirety of `onie-tlv.c` and thus the patched code, *cannot* be executed on amd64 in standard virtualized environments. It requires specialized hardware (OCP network switches) or very specific embedded platforms. The code is structurally unreachable.

Therefore, `WorthFuzzing = false`.

To be precise, the `Reasoning` should be a concise version of the analysis above.  Since the code is not reachable in the target environment, there's no need to extract any specific kernel functions, so `FocusSymbols = []` and `EnableConfigs = []`.  Let's finalize this by setting the results.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch adds a missing of_node_put() in the error handling path of onie_tlv_add_cells() in drivers/nvmem/layouts/onie-tlv.c. This driver parses Open Compute Project ONIE TLV tables from NVMEM devices described in Open Firmware / Device Tree (OF) nodes. On the target architecture (amd64), Device Tree hardware topology is not used (systems boot via ACPI/BIOS), and standard virtualized QEMU/GCE environments lack emulation for this physical network switch hardware or OF layout. Therefore, the modified code is structurally unreachable and not worth fuzzing.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch adds a missing of_node_put() in the error handling path of onie_tlv_add_cells() in drivers/nvmem/layouts/onie-tlv.c. This driver parses Open Compute Project ONIE TLV tables from NVMEM devices described in Open Firmware / Device Tree (OF) nodes. On the target architecture (amd64), Device Tree hardware topology is not used (systems boot via ACPI/BIOS), and standard virtualized QEMU/GCE environments lack emulation for this physical network switch hardware or OF layout. Therefore, the modified code is structurally unreachable and not worth fuzzing.",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

null