AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch modifies s390-specific memory allocation helpers and the s390 Channel I/O (CIO) subsystem (arch/s390/include/asm/idals.h and drivers/s390/cio/*). These files are exclusive to the s390 architecture and are not compiled or reachable on the target architecture (amd64).",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit 6440f1e0b9cbea063e9cfc62c87e169ec22f781d\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Mon Sep 7 14:12:32 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/arch/s390/include/asm/idals.h b/arch/s390/include/asm/idals.h\nindex 06e1ec2afd5af..248829d461bce 100644\n--- a/arch/s390/include/asm/idals.h\n+++ b/arch/s390/include/asm/idals.h\n@@ -147,7 +147,7 @@ static inline struct idal_buffer *idal_buffer_alloc(size_t size, int page_order)\n \t\t\tib-\u003edata[i] = dma64_add(ib-\u003edata[i - 1], IDA_BLOCK_SIZE);\n \t\t\tcontinue;\n \t\t}\n-\t\tvaddr = (void *)__get_free_pages(GFP_KERNEL, page_order);\n+\t\tvaddr = kmalloc(PAGE_SIZE \u003c\u003c page_order, GFP_KERNEL);\n \t\tif (!vaddr)\n \t\t\tgoto error;\n \t\tib-\u003edata[i] = virt_to_dma64(vaddr);\n@@ -157,7 +157,7 @@ static inline struct idal_buffer *idal_buffer_alloc(size_t size, int page_order)\n \twhile (i \u003e= nr_chunks) {\n \t\ti -= nr_chunks;\n \t\tvaddr = dma64_to_virt(ib-\u003edata[i]);\n-\t\tfree_pages((unsigned long)vaddr, ib-\u003epage_order);\n+\t\tkfree(vaddr);\n \t}\n \tkfree(ib);\n \treturn ERR_PTR(-ENOMEM);\n@@ -175,7 +175,7 @@ static inline void idal_buffer_free(struct idal_buffer *ib)\n \tnr_chunks = (PAGE_SIZE \u003c\u003c ib-\u003epage_order) \u003e\u003e IDA_SIZE_SHIFT;\n \tfor (i = 0; i \u003c nr_ptrs; i += nr_chunks) {\n \t\tvaddr = dma64_to_virt(ib-\u003edata[i]);\n-\t\tfree_pages((unsigned long)vaddr, ib-\u003epage_order);\n+\t\tkfree(vaddr);\n \t}\n \tkfree(ib);\n }\ndiff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c\nindex 9689f722c863c..d98f629e89295 100644\n--- a/drivers/s390/cio/chsc.c\n+++ b/drivers/s390/cio/chsc.c\n@@ -931,12 +931,12 @@ static int cub_alloc(struct channel_subsystem *css)\n \tint i;\n \n \tfor (i = 0; i \u003c CSS_NUM_CUB_PAGES; i++) {\n-\t\tcss-\u003ecub[i] = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);\n+\t\tcss-\u003ecub[i] = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n \t\tif (!css-\u003ecub[i])\n \t\t\treturn -ENOMEM;\n \t}\n \tfor (i = 0; i \u003c CSS_NUM_ECUB_PAGES; i++) {\n-\t\tcss-\u003eecub[i] = (void *)get_zeroed_page(GFP_KERNEL);\n+\t\tcss-\u003eecub[i] = kzalloc(PAGE_SIZE, GFP_KERNEL);\n \t\tif (!css-\u003eecub[i])\n \t\t\treturn -ENOMEM;\n \t}\n@@ -949,11 +949,11 @@ static void cub_free(struct channel_subsystem *css)\n \tint i;\n \n \tfor (i = 0; i \u003c CSS_NUM_CUB_PAGES; i++) {\n-\t\tfree_page((unsigned long)css-\u003ecub[i]);\n+\t\tkfree(css-\u003ecub[i]);\n \t\tcss-\u003ecub[i] = NULL;\n \t}\n \tfor (i = 0; i \u003c CSS_NUM_ECUB_PAGES; i++) {\n-\t\tfree_page((unsigned long)css-\u003eecub[i]);\n+\t\tkfree(css-\u003eecub[i]);\n \t\tcss-\u003eecub[i] = NULL;\n \t}\n }\n@@ -1142,8 +1142,8 @@ int __init chsc_init(void)\n {\n \tint ret;\n \n-\tsei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);\n-\tchsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);\n+\tsei_page = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n+\tchsc_page = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n \tif (!sei_page || !chsc_page) {\n \t\tret = -ENOMEM;\n \t\tgoto out_err;\n@@ -1153,16 +1153,16 @@ int __init chsc_init(void)\n \t\tgoto out_err;\n \treturn ret;\n out_err:\n-\tfree_page((unsigned long)chsc_page);\n-\tfree_page((unsigned long)sei_page);\n+\tkfree(chsc_page);\n+\tkfree(sei_page);\n \treturn ret;\n }\n \n void __init chsc_init_cleanup(void)\n {\n \tcrw_unregister_handler(CRW_RSC_CSS);\n-\tfree_page((unsigned long)chsc_page);\n-\tfree_page((unsigned long)sei_page);\n+\tkfree(chsc_page);\n+\tkfree(sei_page);\n }\n \n int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)\ndiff --git a/drivers/s390/cio/chsc_sch.c b/drivers/s390/cio/chsc_sch.c\nindex b6cb8bb8bcc4b..225aaac7dd309 100644\n--- a/drivers/s390/cio/chsc_sch.c\n+++ b/drivers/s390/cio/chsc_sch.c\n@@ -15,6 +15,7 @@\n #include \u003clinux/uaccess.h\u003e\n #include \u003clinux/miscdevice.h\u003e\n #include \u003clinux/kernel_stat.h\u003e\n+#include \u003clinux/cleanup.h\u003e\n \n #include \u003casm/cio.h\u003e\n #include \u003casm/chsc.h\u003e\n@@ -292,7 +293,7 @@ static int chsc_ioctl_start(void __user *user_area)\n \tif (!css_general_characteristics.dynio)\n \t\t/* It makes no sense to try. */\n \t\treturn -EOPNOTSUPP;\n-\tchsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);\n+\tchsc_area = kzalloc(PAGE_SIZE, GFP_DMA | GFP_KERNEL);\n \tif (!chsc_area)\n \t\treturn -ENOMEM;\n \trequest = kzalloc_obj(*request);\n@@ -321,7 +322,7 @@ static int chsc_ioctl_start(void __user *user_area)\n \tsnprintf(dbf, sizeof(dbf), \"ret:%d\", ret);\n \tCHSC_LOG(0, dbf);\n \tkfree(request);\n-\tfree_page((unsigned long)chsc_area);\n+\tkfree(chsc_area);\n \treturn ret;\n }\n \n@@ -340,7 +341,7 @@ static int chsc_ioctl_on_close_set(void __user *user_area)\n \t\tret = -ENOMEM;\n \t\tgoto out_unlock;\n \t}\n-\ton_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);\n+\ton_close_chsc_area = kzalloc(PAGE_SIZE, GFP_DMA | GFP_KERNEL);\n \tif (!on_close_chsc_area) {\n \t\tret = -ENOMEM;\n \t\tgoto out_free_request;\n@@ -353,7 +354,7 @@ static int chsc_ioctl_on_close_set(void __user *user_area)\n \tgoto out_unlock;\n \n out_free_chsc:\n-\tfree_page((unsigned long)on_close_chsc_area);\n+\tkfree(on_close_chsc_area);\n \ton_close_chsc_area = NULL;\n out_free_request:\n \tkfree(on_close_request);\n@@ -375,7 +376,7 @@ static int chsc_ioctl_on_close_remove(void)\n \t\tret = -ENOENT;\n \t\tgoto out_unlock;\n \t}\n-\tfree_page((unsigned long)on_close_chsc_area);\n+\tkfree(on_close_chsc_area);\n \ton_close_chsc_area = NULL;\n \tkfree(on_close_request);\n \ton_close_request = NULL;\n@@ -389,39 +390,29 @@ static int chsc_ioctl_on_close_remove(void)\n \n static int chsc_ioctl_start_sync(void __user *user_area)\n {\n-\tstruct chsc_sync_area *chsc_area;\n-\tint ret, ccode;\n+\tstruct chsc_sync_area *chsc_area __free(kfree) = NULL;\n+\tint ccode;\n \n-\tchsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);\n+\tchsc_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n \tif (!chsc_area)\n \t\treturn -ENOMEM;\n-\tif (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {\n-\t\tret = -EFAULT;\n-\t\tgoto out_free;\n-\t}\n-\tif (chsc_area-\u003eheader.code \u0026 0x4000) {\n-\t\tret = -EINVAL;\n-\t\tgoto out_free;\n-\t}\n+\tif (copy_from_user(chsc_area, user_area, PAGE_SIZE))\n+\t\treturn -EFAULT;\n+\tif (chsc_area-\u003eheader.code \u0026 0x4000)\n+\t\treturn -EINVAL;\n \tchsc_log_command(chsc_area);\n \tccode = chsc(chsc_area);\n-\tif (ccode != 0) {\n-\t\tret = -EIO;\n-\t\tgoto out_free;\n-\t}\n+\tif (ccode != 0)\n+\t\treturn -EIO;\n \tif (copy_to_user(user_area, chsc_area, PAGE_SIZE))\n-\t\tret = -EFAULT;\n-\telse\n-\t\tret = 0;\n-out_free:\n-\tfree_page((unsigned long)chsc_area);\n-\treturn ret;\n+\t\treturn -EFAULT;\n+\treturn 0;\n }\n \n static int chsc_ioctl_info_channel_path(void __user *user_cd)\n {\n-\tstruct chsc_chp_cd *cd;\n-\tint ret, ccode;\n+\tstruct chsc_chp_cd *cd __free(kfree) = NULL;\n+\tint ccode;\n \tstruct {\n \t\tstruct chsc_header request;\n \t\tu32 : 2;\n@@ -436,20 +427,16 @@ static int chsc_ioctl_info_channel_path(void __user *user_cd)\n \t\tu32 : 32;\n \t\tstruct chsc_header response;\n \t\tu8 data[PAGE_SIZE - 20];\n-\t} __attribute__ ((packed)) *scpcd_area;\n+\t} __attribute__ ((packed)) *scpcd_area __free(kfree) = NULL;\n \n-\tscpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);\n+\tscpcd_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n \tif (!scpcd_area)\n \t\treturn -ENOMEM;\n \tcd = kzalloc_obj(*cd);\n-\tif (!cd) {\n-\t\tret = -ENOMEM;\n-\t\tgoto out_free;\n-\t}\n-\tif (copy_from_user(cd, user_cd, sizeof(*cd))) {\n-\t\tret = -EFAULT;\n-\t\tgoto out_free;\n-\t}\n+\tif (!cd)\n+\t\treturn -ENOMEM;\n+\tif (copy_from_user(cd, user_cd, sizeof(*cd)))\n+\t\treturn -EFAULT;\n \tscpcd_area-\u003erequest.length = 0x0010;\n \tscpcd_area-\u003erequest.code = 0x0028;\n \tscpcd_area-\u003em = cd-\u003em;\n@@ -459,31 +446,23 @@ static int chsc_ioctl_info_channel_path(void __user *user_cd)\n \tscpcd_area-\u003elast_chpid = cd-\u003echpid.id;\n \n \tccode = chsc(scpcd_area);\n-\tif (ccode != 0) {\n-\t\tret = -EIO;\n-\t\tgoto out_free;\n-\t}\n+\tif (ccode != 0)\n+\t\treturn -EIO;\n \tif (scpcd_area-\u003eresponse.code != 0x0001) {\n-\t\tret = -EIO;\n \t\tCHSC_MSG(0, \"scpcd: response code=%x\\n\",\n \t\t\t scpcd_area-\u003eresponse.code);\n-\t\tgoto out_free;\n+\t\treturn -EIO;\n \t}\n \tmemcpy(\u0026cd-\u003ecpcb, \u0026scpcd_area-\u003eresponse, scpcd_area-\u003eresponse.length);\n \tif (copy_to_user(user_cd, cd, sizeof(*cd)))\n-\t\tret = -EFAULT;\n-\telse\n-\t\tret = 0;\n-out_free:\n-\tkfree(cd);\n-\tfree_page((unsigned long)scpcd_area);\n-\treturn ret;\n+\t\treturn -EFAULT;\n+\treturn 0;\n }\n \n static int chsc_ioctl_info_cu(void __user *user_cd)\n {\n-\tstruct chsc_cu_cd *cd;\n-\tint ret, ccode;\n+\tstruct chsc_cu_cd *cd __free(kfree) = NULL;\n+\tint ccode;\n \tstruct {\n \t\tstruct chsc_header request;\n \t\tu32 : 2;\n@@ -498,20 +477,16 @@ static int chsc_ioctl_info_cu(void __user *user_cd)\n \t\tu32 : 32;\n \t\tstruct chsc_header response;\n \t\tu8 data[PAGE_SIZE - 20];\n-\t} __attribute__ ((packed)) *scucd_area;\n+\t} __attribute__ ((packed)) *scucd_area __free(kfree) = NULL;\n \n-\tscucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);\n+\tscucd_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n \tif (!scucd_area)\n \t\treturn -ENOMEM;\n \tcd = kzalloc_obj(*cd);\n-\tif (!cd) {\n-\t\tret = -ENOMEM;\n-\t\tgoto out_free;\n-\t}\n-\tif (copy_from_user(cd, user_cd, sizeof(*cd))) {\n-\t\tret = -EFAULT;\n-\t\tgoto out_free;\n-\t}\n+\tif (!cd)\n+\t\treturn -ENOMEM;\n+\tif (copy_from_user(cd, user_cd, sizeof(*cd)))\n+\t\treturn -EFAULT;\n \tscucd_area-\u003erequest.length = 0x0010;\n \tscucd_area-\u003erequest.code = 0x0026;\n \tscucd_area-\u003em = cd-\u003em;\n@@ -521,31 +496,23 @@ static int chsc_ioctl_info_cu(void __user *user_cd)\n \tscucd_area-\u003elast_cun = cd-\u003ecun;\n \n \tccode = chsc(scucd_area);\n-\tif (ccode != 0) {\n-\t\tret = -EIO;\n-\t\tgoto out_free;\n-\t}\n+\tif (ccode != 0)\n+\t\treturn -EIO;\n \tif (scucd_area-\u003eresponse.code != 0x0001) {\n-\t\tret = -EIO;\n \t\tCHSC_MSG(0, \"scucd: response code=%x\\n\",\n \t\t\t scucd_area-\u003eresponse.code);\n-\t\tgoto out_free;\n+\t\treturn -EIO;\n \t}\n \tmemcpy(\u0026cd-\u003ecucb, \u0026scucd_area-\u003eresponse, scucd_area-\u003eresponse.length);\n \tif (copy_to_user(user_cd, cd, sizeof(*cd)))\n-\t\tret = -EFAULT;\n-\telse\n-\t\tret = 0;\n-out_free:\n-\tkfree(cd);\n-\tfree_page((unsigned long)scucd_area);\n-\treturn ret;\n+\t\treturn -EFAULT;\n+\treturn 0;\n }\n \n static int chsc_ioctl_info_sch_cu(void __user *user_cud)\n {\n-\tstruct chsc_sch_cud *cud;\n-\tint ret, ccode;\n+\tstruct chsc_sch_cud *cud __free(kfree) = NULL;\n+\tint ccode;\n \tstruct {\n \t\tstruct chsc_header request;\n \t\tu32 : 2;\n@@ -561,20 +528,16 @@ static int chsc_ioctl_info_sch_cu(void __user *user_cud)\n \t\tu32 : 32;\n \t\tstruct chsc_header response;\n \t\tu8 data[PAGE_SIZE - 20];\n-\t} __attribute__ ((packed)) *sscud_area;\n+\t} __attribute__ ((packed)) *sscud_area __free(kfree) = NULL;\n \n-\tsscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);\n+\tsscud_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n \tif (!sscud_area)\n \t\treturn -ENOMEM;\n \tcud = kzalloc_obj(*cud);\n-\tif (!cud) {\n-\t\tret = -ENOMEM;\n-\t\tgoto out_free;\n-\t}\n-\tif (copy_from_user(cud, user_cud, sizeof(*cud))) {\n-\t\tret = -EFAULT;\n-\t\tgoto out_free;\n-\t}\n+\tif (!cud)\n+\t\treturn -ENOMEM;\n+\tif (copy_from_user(cud, user_cud, sizeof(*cud)))\n+\t\treturn -EFAULT;\n \tsscud_area-\u003erequest.length = 0x0010;\n \tsscud_area-\u003erequest.code = 0x0006;\n \tsscud_area-\u003em = cud-\u003eschid.m;\n@@ -585,31 +548,23 @@ static int chsc_ioctl_info_sch_cu(void __user *user_cud)\n \tsscud_area-\u003elast_sch = cud-\u003eschid.sch_no;\n \n \tccode = chsc(sscud_area);\n-\tif (ccode != 0) {\n-\t\tret = -EIO;\n-\t\tgoto out_free;\n-\t}\n+\tif (ccode != 0)\n+\t\treturn -EIO;\n \tif (sscud_area-\u003eresponse.code != 0x0001) {\n-\t\tret = -EIO;\n \t\tCHSC_MSG(0, \"sscud: response code=%x\\n\",\n \t\t\t sscud_area-\u003eresponse.code);\n-\t\tgoto out_free;\n+\t\treturn -EIO;\n \t}\n \tmemcpy(\u0026cud-\u003escub, \u0026sscud_area-\u003eresponse, sscud_area-\u003eresponse.length);\n \tif (copy_to_user(user_cud, cud, sizeof(*cud)))\n-\t\tret = -EFAULT;\n-\telse\n-\t\tret = 0;\n-out_free:\n-\tkfree(cud);\n-\tfree_page((unsigned long)sscud_area);\n-\treturn ret;\n+\t\treturn -EFAULT;\n+\treturn 0;\n }\n \n static int chsc_ioctl_conf_info(void __user *user_ci)\n {\n-\tstruct chsc_conf_info *ci;\n-\tint ret, ccode;\n+\tstruct chsc_conf_info *ci __free(kfree) = NULL;\n+\tint ccode;\n \tstruct {\n \t\tstruct chsc_header request;\n \t\tu32 : 2;\n@@ -623,20 +578,16 @@ static int chsc_ioctl_conf_info(void __user *user_ci)\n \t\tu64 : 64;\n \t\tstruct chsc_header response;\n \t\tu8 data[PAGE_SIZE - 20];\n-\t} __attribute__ ((packed)) *sci_area;\n+\t} __attribute__ ((packed)) *sci_area __free(kfree) = NULL;\n \n-\tsci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);\n+\tsci_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n \tif (!sci_area)\n \t\treturn -ENOMEM;\n \tci = kzalloc_obj(*ci);\n-\tif (!ci) {\n-\t\tret = -ENOMEM;\n-\t\tgoto out_free;\n-\t}\n-\tif (copy_from_user(ci, user_ci, sizeof(*ci))) {\n-\t\tret = -EFAULT;\n-\t\tgoto out_free;\n-\t}\n+\tif (!ci)\n+\t\treturn -ENOMEM;\n+\tif (copy_from_user(ci, user_ci, sizeof(*ci)))\n+\t\treturn -EFAULT;\n \tsci_area-\u003erequest.length = 0x0010;\n \tsci_area-\u003erequest.code = 0x0012;\n \tsci_area-\u003em = ci-\u003eid.m;\n@@ -645,31 +596,23 @@ static int chsc_ioctl_conf_info(void __user *user_ci)\n \tsci_area-\u003essid = ci-\u003eid.ssid;\n \n \tccode = chsc(sci_area);\n-\tif (ccode != 0) {\n-\t\tret = -EIO;\n-\t\tgoto out_free;\n-\t}\n+\tif (ccode != 0)\n+\t\treturn -EIO;\n \tif (sci_area-\u003eresponse.code != 0x0001) {\n-\t\tret = -EIO;\n \t\tCHSC_MSG(0, \"sci: response code=%x\\n\",\n \t\t\t sci_area-\u003eresponse.code);\n-\t\tgoto out_free;\n+\t\treturn -EIO;\n \t}\n \tmemcpy(\u0026ci-\u003escid, \u0026sci_area-\u003eresponse, sci_area-\u003eresponse.length);\n \tif (copy_to_user(user_ci, ci, sizeof(*ci)))\n-\t\tret = -EFAULT;\n-\telse\n-\t\tret = 0;\n-out_free:\n-\tkfree(ci);\n-\tfree_page((unsigned long)sci_area);\n-\treturn ret;\n+\t\treturn -EFAULT;\n+\treturn 0;\n }\n \n static int chsc_ioctl_conf_comp_list(void __user *user_ccl)\n {\n-\tstruct chsc_comp_list *ccl;\n-\tint ret, ccode;\n+\tstruct chsc_comp_list *ccl __free(kfree) = NULL;\n+\tint ccode;\n \tstruct {\n \t\tstruct chsc_header request;\n \t\tu32 ctype : 8;\n@@ -681,7 +624,7 @@ static int chsc_ioctl_conf_comp_list(void __user *user_ccl)\n \t\tu64 : 64;\n \t\tstruct chsc_header response;\n \t\tu8 data[PAGE_SIZE - 36];\n-\t} __attribute__ ((packed)) *sccl_area;\n+\t} __attribute__ ((packed)) *sccl_area __free(kfree) = NULL;\n \tstruct {\n \t\tu32 m : 1;\n \t\tu32 : 31;\n@@ -696,18 +639,14 @@ static int chsc_ioctl_conf_comp_list(void __user *user_ccl)\n \t\tu32 res;\n \t} __attribute__ ((packed)) *cssids_parm;\n \n-\tsccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);\n+\tsccl_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n \tif (!sccl_area)\n \t\treturn -ENOMEM;\n \tccl = kzalloc_obj(*ccl);\n-\tif (!ccl) {\n-\t\tret = -ENOMEM;\n-\t\tgoto out_free;\n-\t}\n-\tif (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {\n-\t\tret = -EFAULT;\n-\t\tgoto out_free;\n-\t}\n+\tif (!ccl)\n+\t\treturn -ENOMEM;\n+\tif (copy_from_user(ccl, user_ccl, sizeof(*ccl)))\n+\t\treturn -EFAULT;\n \tsccl_area-\u003erequest.length = 0x0020;\n \tsccl_area-\u003erequest.code = 0x0030;\n \tsccl_area-\u003efmt = ccl-\u003ereq.fmt;\n@@ -728,61 +667,46 @@ static int chsc_ioctl_conf_comp_list(void __user *user_ccl)\n \t\tbreak;\n \t}\n \tccode = chsc(sccl_area);\n-\tif (ccode != 0) {\n-\t\tret = -EIO;\n-\t\tgoto out_free;\n-\t}\n+\tif (ccode != 0)\n+\t\treturn -EIO;\n \tif (sccl_area-\u003eresponse.code != 0x0001) {\n-\t\tret = -EIO;\n \t\tCHSC_MSG(0, \"sccl: response code=%x\\n\",\n \t\t\t sccl_area-\u003eresponse.code);\n-\t\tgoto out_free;\n+\t\treturn -EIO;\n \t}\n \tmemcpy(\u0026ccl-\u003esccl, \u0026sccl_area-\u003eresponse, sccl_area-\u003eresponse.length);\n \tif (copy_to_user(user_ccl, ccl, sizeof(*ccl)))\n-\t\tret = -EFAULT;\n-\telse\n-\t\tret = 0;\n-out_free:\n-\tkfree(ccl);\n-\tfree_page((unsigned long)sccl_area);\n-\treturn ret;\n+\t\treturn -EFAULT;\n+\treturn 0;\n }\n \n static int chsc_ioctl_chpd(void __user *user_chpd)\n {\n-\tstruct chsc_scpd *scpd_area;\n-\tstruct chsc_cpd_info *chpd;\n+\tstruct chsc_scpd *scpd_area __free(kfree) = NULL;\n+\tstruct chsc_cpd_info *chpd __free(kfree) = NULL;\n \tint ret;\n \n \tchpd = kzalloc_obj(*chpd);\n-\tscpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);\n-\tif (!scpd_area || !chpd) {\n-\t\tret = -ENOMEM;\n-\t\tgoto out_free;\n-\t}\n-\tif (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {\n-\t\tret = -EFAULT;\n-\t\tgoto out_free;\n-\t}\n+\tscpd_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n+\tif (!scpd_area || !chpd)\n+\t\treturn -ENOMEM;\n+\tif (copy_from_user(chpd, user_chpd, sizeof(*chpd)))\n+\t\treturn -EFAULT;\n \tret = chsc_determine_channel_path_desc(chpd-\u003echpid, chpd-\u003efmt,\n \t\t\t\t\t       chpd-\u003erfmt, chpd-\u003ec, chpd-\u003em,\n \t\t\t\t\t       scpd_area);\n \tif (ret)\n-\t\tgoto out_free;\n+\t\treturn ret;\n \tmemcpy(\u0026chpd-\u003echpdb, \u0026scpd_area-\u003eresponse, scpd_area-\u003eresponse.length);\n \tif (copy_to_user(user_chpd, chpd, sizeof(*chpd)))\n-\t\tret = -EFAULT;\n-out_free:\n-\tkfree(chpd);\n-\tfree_page((unsigned long)scpd_area);\n-\treturn ret;\n+\t\treturn -EFAULT;\n+\treturn 0;\n }\n \n static int chsc_ioctl_dcal(void __user *user_dcal)\n {\n-\tstruct chsc_dcal *dcal;\n-\tint ret, ccode;\n+\tstruct chsc_dcal *dcal __free(kfree) = NULL;\n+\tint ccode;\n \tstruct {\n \t\tstruct chsc_header request;\n \t\tu32 atype : 8;\n@@ -794,20 +718,16 @@ static int chsc_ioctl_dcal(void __user *user_dcal)\n \t\tu32 res1[2];\n \t\tstruct chsc_header response;\n \t\tu8 data[PAGE_SIZE - 36];\n-\t} __attribute__ ((packed)) *sdcal_area;\n+\t} __attribute__ ((packed)) *sdcal_area __free(kfree) = NULL;\n \n-\tsdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);\n+\tsdcal_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n \tif (!sdcal_area)\n \t\treturn -ENOMEM;\n \tdcal = kzalloc_obj(*dcal);\n-\tif (!dcal) {\n-\t\tret = -ENOMEM;\n-\t\tgoto out_free;\n-\t}\n-\tif (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {\n-\t\tret = -EFAULT;\n-\t\tgoto out_free;\n-\t}\n+\tif (!dcal)\n+\t\treturn -ENOMEM;\n+\tif (copy_from_user(dcal, user_dcal, sizeof(*dcal)))\n+\t\treturn -EFAULT;\n \tsdcal_area-\u003erequest.length = 0x0020;\n \tsdcal_area-\u003erequest.code = 0x0034;\n \tsdcal_area-\u003eatype = dcal-\u003ereq.atype;\n@@ -816,26 +736,18 @@ static int chsc_ioctl_dcal(void __user *user_dcal)\n \t       sizeof(sdcal_area-\u003elist_parm));\n \n \tccode = chsc(sdcal_area);\n-\tif (ccode != 0) {\n-\t\tret = -EIO;\n-\t\tgoto out_free;\n-\t}\n+\tif (ccode != 0)\n+\t\treturn -EIO;\n \tif (sdcal_area-\u003eresponse.code != 0x0001) {\n-\t\tret = -EIO;\n \t\tCHSC_MSG(0, \"sdcal: response code=%x\\n\",\n \t\t\t sdcal_area-\u003eresponse.code);\n-\t\tgoto out_free;\n+\t\treturn -EIO;\n \t}\n \tmemcpy(\u0026dcal-\u003esdcal, \u0026sdcal_area-\u003eresponse,\n \t       sdcal_area-\u003eresponse.length);\n \tif (copy_to_user(user_dcal, dcal, sizeof(*dcal)))\n-\t\tret = -EFAULT;\n-\telse\n-\t\tret = 0;\n-out_free:\n-\tkfree(dcal);\n-\tfree_page((unsigned long)sdcal_area);\n-\treturn ret;\n+\t\treturn -EFAULT;\n+\treturn 0;\n }\n \n static long chsc_ioctl(struct file *filp, unsigned int cmd,\n@@ -904,7 +816,7 @@ static int chsc_release(struct inode *inode, struct file *filp)\n \t}\n \tsnprintf(dbf, sizeof(dbf), \"relret:%d\", ret);\n \tCHSC_LOG(0, dbf);\n-\tfree_page((unsigned long)on_close_chsc_area);\n+\tkfree(on_close_chsc_area);\n \ton_close_chsc_area = NULL;\n \tkfree(on_close_request);\n \ton_close_request = NULL;\ndiff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c\nindex 92ab3d546fe47..6c46b0d0b3da4 100644\n--- a/drivers/s390/cio/cmf.c\n+++ b/drivers/s390/cio/cmf.c\n@@ -501,12 +501,12 @@ static int alloc_cmb(struct ccw_device *cdev)\n \t\tWARN_ON(!list_empty(\u0026cmb_area.list));\n \n \t\tspin_unlock(\u0026cmb_area.lock);\n-\t\tmem = (void *)__get_free_pages(GFP_KERNEL, get_order(size));\n+\t\tmem = kmalloc(PAGE_SIZE \u003c\u003c get_order(size), GFP_KERNEL);\n \t\tspin_lock(\u0026cmb_area.lock);\n \n \t\tif (cmb_area.mem) {\n \t\t\t/* ok, another thread was faster */\n-\t\t\tfree_pages((unsigned long)mem, get_order(size));\n+\t\t\tkfree(mem);\n \t\t} else if (!mem) {\n \t\t\t/* no luck */\n \t\t\tret = -ENOMEM;\n@@ -547,10 +547,8 @@ static void free_cmb(struct ccw_device *cdev)\n \tlist_del_init(\u0026priv-\u003ecmb_list);\n \n \tif (list_empty(\u0026cmb_area.list)) {\n-\t\tssize_t size;\n-\t\tsize = sizeof(struct cmb) * cmb_area.num_channels;\n \t\tcmf_activate(NULL, CMF_OFF);\n-\t\tfree_pages((unsigned long)cmb_area.mem, get_order(size));\n+\t\tkfree(cmb_area.mem);\n \t\tcmb_area.mem = NULL;\n \t}\n \tspin_unlock_irq(cdev-\u003eccwlock);\ndiff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h\nindex 4bd4c00c9c0ca..dff5f53a8795d 100644\n--- a/drivers/s390/cio/qdio.h\n+++ b/drivers/s390/cio/qdio.h\n@@ -244,7 +244,7 @@ struct qdio_irq {\n \tint perf_stat_enabled;\n \n \tstruct qdr *qdr;\n-\tunsigned long chsc_page;\n+\tvoid *chsc_page;\n \n \tstruct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];\n \tstruct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];\ndiff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c\nindex c1e09fa34e774..bebc1250ebebf 100644\n--- a/drivers/s390/cio/qdio_main.c\n+++ b/drivers/s390/cio/qdio_main.c\n@@ -17,6 +17,7 @@\n #include \u003clinux/gfp.h\u003e\n #include \u003clinux/io.h\u003e\n #include \u003clinux/atomic.h\u003e\n+#include \u003clinux/slab.h\u003e\n #include \u003casm/debug.h\u003e\n #include \u003casm/qdio.h\u003e\n #include \u003casm/asm.h\u003e\n@@ -933,10 +934,10 @@ int qdio_free(struct ccw_device *cdev)\n \tmutex_unlock(\u0026irq_ptr-\u003esetup_mutex);\n \n \tqdio_free_queues(irq_ptr);\n-\tfree_page((unsigned long) irq_ptr-\u003eqdr);\n-\tfree_page(irq_ptr-\u003echsc_page);\n+\tkfree(irq_ptr-\u003eqdr);\n+\tkfree(irq_ptr-\u003echsc_page);\n \tkfree(irq_ptr-\u003eccw);\n-\tfree_page((unsigned long) irq_ptr);\n+\tkfree(irq_ptr);\n \treturn 0;\n }\n EXPORT_SYMBOL_GPL(qdio_free);\n@@ -961,7 +962,7 @@ int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,\n \t    no_output_qs \u003e QDIO_MAX_QUEUES_PER_IRQ)\n \t\treturn -EINVAL;\n \n-\tirq_ptr = (void *) get_zeroed_page(GFP_KERNEL);\n+\tirq_ptr = kzalloc(PAGE_SIZE, GFP_KERNEL);\n \tif (!irq_ptr)\n \t\treturn -ENOMEM;\n \n@@ -986,12 +987,12 @@ int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,\n \t * qdio_establish. In case of low memory and swap on a zfcp disk\n \t * we may not be able to allocate memory otherwise.\n \t */\n-\tirq_ptr-\u003echsc_page = get_zeroed_page(GFP_KERNEL);\n+\tirq_ptr-\u003echsc_page = kzalloc(PAGE_SIZE, GFP_KERNEL);\n \tif (!irq_ptr-\u003echsc_page)\n \t\tgoto err_chsc;\n \n \t/* qdr is used in ccw1.cda which is u32 */\n-\tirq_ptr-\u003eqdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);\n+\tirq_ptr-\u003eqdr = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n \tif (!irq_ptr-\u003eqdr)\n \t\tgoto err_qdr;\n \n@@ -1004,14 +1005,14 @@ int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,\n \treturn 0;\n \n err_queues:\n-\tfree_page((unsigned long) irq_ptr-\u003eqdr);\n+\tkfree(irq_ptr-\u003eqdr);\n err_qdr:\n-\tfree_page(irq_ptr-\u003echsc_page);\n+\tkfree(irq_ptr-\u003echsc_page);\n err_chsc:\n err_dbf:\n \tkfree(irq_ptr-\u003eccw);\n err_ccw:\n-\tfree_page((unsigned long) irq_ptr);\n+\tkfree(irq_ptr);\n \treturn rc;\n }\n EXPORT_SYMBOL_GPL(qdio_allocate);\ndiff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c\nindex ea09aadaae4ec..c0215a7d29a81 100644\n--- a/drivers/s390/cio/qdio_setup.c\n+++ b/drivers/s390/cio/qdio_setup.c\n@@ -35,7 +35,7 @@ void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)\n \tint pos;\n \n \tfor (pos = 0; pos \u003c count; pos += QBUFF_PER_PAGE)\n-\t\tfree_page((unsigned long) buf[pos]);\n+\t\tkfree(buf[pos]);\n }\n EXPORT_SYMBOL_GPL(qdio_free_buffers);\n \n@@ -49,7 +49,7 @@ int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)\n \tint pos;\n \n \tfor (pos = 0; pos \u003c count; pos += QBUFF_PER_PAGE) {\n-\t\tbuf[pos] = (void *) get_zeroed_page(GFP_KERNEL);\n+\t\tbuf[pos] = kzalloc(PAGE_SIZE, GFP_KERNEL);\n \t\tif (!buf[pos]) {\n \t\t\tqdio_free_buffers(buf, count);\n \t\t\treturn -ENOMEM;\n@@ -83,7 +83,7 @@ static void __qdio_free_queues(struct qdio_q **queues, unsigned int count)\n \n \tfor (i = 0; i \u003c count; i++) {\n \t\tq = queues[i];\n-\t\tfree_page((unsigned long)q-\u003esl_page);\n+\t\tkfree(q-\u003esl_page);\n \t\tkmem_cache_free(qdio_q_cache, q);\n \t}\n }\n@@ -109,7 +109,7 @@ static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)\n \t\t\treturn -ENOMEM;\n \t\t}\n \n-\t\tq-\u003esl_page = (void *)__get_free_page(GFP_KERNEL);\n+\t\tq-\u003esl_page = kzalloc(PAGE_SIZE, GFP_KERNEL);\n \t\tif (!q-\u003esl_page) {\n \t\t\tkmem_cache_free(qdio_q_cache, q);\n \t\t\t__qdio_free_queues(irq_ptr_qs, i);\n@@ -249,11 +249,11 @@ int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,\n \n \tDBF_EVENT(\"getssqd:%4x\", schid-\u003esch_no);\n \tif (!irq_ptr) {\n-\t\tssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);\n+\t\tssqd = kzalloc(PAGE_SIZE, GFP_KERNEL);\n \t\tif (!ssqd)\n \t\t\treturn -ENOMEM;\n \t} else {\n-\t\tssqd = (struct chsc_ssqd_area *)irq_ptr-\u003echsc_page;\n+\t\tssqd = irq_ptr-\u003echsc_page;\n \t}\n \n \trc = chsc_ssqd(*schid, ssqd);\n@@ -270,7 +270,7 @@ int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,\n \n out:\n \tif (!irq_ptr)\n-\t\tfree_page((unsigned long)ssqd);\n+\t\tkfree(ssqd);\n \n \treturn rc;\n }\ndiff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c\nindex e167aa75c3dff..a2ff51887537f 100644\n--- a/drivers/s390/cio/qdio_thinint.c\n+++ b/drivers/s390/cio/qdio_thinint.c\n@@ -136,7 +136,7 @@ static struct airq_struct tiqdio_airq = {\n \n static int set_subchannel_ind(struct qdio_irq *irq_ptr, int reset)\n {\n-\tstruct chsc_scssc_area *scssc = (void *)irq_ptr-\u003echsc_page;\n+\tstruct chsc_scssc_area *scssc = irq_ptr-\u003echsc_page;\n \tdma64_t summary_indicator_addr, subchannel_indicator_addr;\n \tint rc;\n \ndiff --git a/drivers/s390/cio/scm.c b/drivers/s390/cio/scm.c\nindex 171212a6d2d9c..b79fe023ab8d1 100644\n--- a/drivers/s390/cio/scm.c\n+++ b/drivers/s390/cio/scm.c\n@@ -13,6 +13,7 @@\n #include \u003clinux/slab.h\u003e\n #include \u003clinux/init.h\u003e\n #include \u003clinux/err.h\u003e\n+#include \u003clinux/cleanup.h\u003e\n #include \u003casm/eadm.h\u003e\n #include \"chsc.h\"\n \n@@ -224,12 +225,12 @@ static int scm_add(struct chsc_scm_info *scm_info, size_t num)\n \n int scm_update_information(void)\n {\n-\tstruct chsc_scm_info *scm_info;\n+\tstruct chsc_scm_info *scm_info __free(kfree) = NULL;\n \tu64 token = 0;\n \tsize_t num;\n \tint ret;\n \n-\tscm_info = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);\n+\tscm_info = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);\n \tif (!scm_info)\n \t\treturn -ENOMEM;\n \n@@ -250,8 +251,6 @@ int scm_update_information(void)\n \t\ttoken = scm_info-\u003erestok;\n \t} while (token);\n \n-\tfree_page((unsigned long)scm_info);\n-\n \treturn ret;\n }\n \n"
}

core

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies s390-specific memory allocation helpers and the s390 Channel I/O (CIO) subsystem (arch/s390/include/asm/idals.h and drivers/s390/cio/*). These files are exclusive to the s390 architecture and are not compiled or reachable on the target architecture (amd64).",
  "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 6440f1e0b9cbea063e9cfc62c87e169ec22f781d
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Sep 7 14:12:32 2026 +0000

    syz-cluster: applied patch under review

diff --git a/arch/s390/include/asm/idals.h b/arch/s390/include/asm/idals.h
index 06e1ec2afd5af..248829d461bce 100644
--- a/arch/s390/include/asm/idals.h
+++ b/arch/s390/include/asm/idals.h
@@ -147,7 +147,7 @@ static inline struct idal_buffer *idal_buffer_alloc(size_t size, int page_order)
 			ib->data[i] = dma64_add(ib->data[i - 1], IDA_BLOCK_SIZE);
 			continue;
 		}
-		vaddr = (void *)__get_free_pages(GFP_KERNEL, page_order);
+		vaddr = kmalloc(PAGE_SIZE << page_order, GFP_KERNEL);
 		if (!vaddr)
 			goto error;
 		ib->data[i] = virt_to_dma64(vaddr);
@@ -157,7 +157,7 @@ static inline struct idal_buffer *idal_buffer_alloc(size_t size, int page_order)
 	while (i >= nr_chunks) {
 		i -= nr_chunks;
 		vaddr = dma64_to_virt(ib->data[i]);
-		free_pages((unsigned long)vaddr, ib->page_order);
+		kfree(vaddr);
 	}
 	kfree(ib);
 	return ERR_PTR(-ENOMEM);
@@ -175,7 +175,7 @@ static inline void idal_buffer_free(struct idal_buffer *ib)
 	nr_chunks = (PAGE_SIZE << ib->page_order) >> IDA_SIZE_SHIFT;
 	for (i = 0; i < nr_ptrs; i += nr_chunks) {
 		vaddr = dma64_to_virt(ib->data[i]);
-		free_pages((unsigned long)vaddr, ib->page_order);
+		kfree(vaddr);
 	}
 	kfree(ib);
 }
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 9689f722c863c..d98f629e89295 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -931,12 +931,12 @@ static int cub_alloc(struct channel_subsystem *css)
 	int i;
 
 	for (i = 0; i < CSS_NUM_CUB_PAGES; i++) {
-		css->cub[i] = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+		css->cub[i] = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 		if (!css->cub[i])
 			return -ENOMEM;
 	}
 	for (i = 0; i < CSS_NUM_ECUB_PAGES; i++) {
-		css->ecub[i] = (void *)get_zeroed_page(GFP_KERNEL);
+		css->ecub[i] = kzalloc(PAGE_SIZE, GFP_KERNEL);
 		if (!css->ecub[i])
 			return -ENOMEM;
 	}
@@ -949,11 +949,11 @@ static void cub_free(struct channel_subsystem *css)
 	int i;
 
 	for (i = 0; i < CSS_NUM_CUB_PAGES; i++) {
-		free_page((unsigned long)css->cub[i]);
+		kfree(css->cub[i]);
 		css->cub[i] = NULL;
 	}
 	for (i = 0; i < CSS_NUM_ECUB_PAGES; i++) {
-		free_page((unsigned long)css->ecub[i]);
+		kfree(css->ecub[i]);
 		css->ecub[i] = NULL;
 	}
 }
@@ -1142,8 +1142,8 @@ int __init chsc_init(void)
 {
 	int ret;
 
-	sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
-	chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	sei_page = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
+	chsc_page = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 	if (!sei_page || !chsc_page) {
 		ret = -ENOMEM;
 		goto out_err;
@@ -1153,16 +1153,16 @@ int __init chsc_init(void)
 		goto out_err;
 	return ret;
 out_err:
-	free_page((unsigned long)chsc_page);
-	free_page((unsigned long)sei_page);
+	kfree(chsc_page);
+	kfree(sei_page);
 	return ret;
 }
 
 void __init chsc_init_cleanup(void)
 {
 	crw_unregister_handler(CRW_RSC_CSS);
-	free_page((unsigned long)chsc_page);
-	free_page((unsigned long)sei_page);
+	kfree(chsc_page);
+	kfree(sei_page);
 }
 
 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
diff --git a/drivers/s390/cio/chsc_sch.c b/drivers/s390/cio/chsc_sch.c
index b6cb8bb8bcc4b..225aaac7dd309 100644
--- a/drivers/s390/cio/chsc_sch.c
+++ b/drivers/s390/cio/chsc_sch.c
@@ -15,6 +15,7 @@
 #include <linux/uaccess.h>
 #include <linux/miscdevice.h>
 #include <linux/kernel_stat.h>
+#include <linux/cleanup.h>
 
 #include <asm/cio.h>
 #include <asm/chsc.h>
@@ -292,7 +293,7 @@ static int chsc_ioctl_start(void __user *user_area)
 	if (!css_general_characteristics.dynio)
 		/* It makes no sense to try. */
 		return -EOPNOTSUPP;
-	chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
+	chsc_area = kzalloc(PAGE_SIZE, GFP_DMA | GFP_KERNEL);
 	if (!chsc_area)
 		return -ENOMEM;
 	request = kzalloc_obj(*request);
@@ -321,7 +322,7 @@ static int chsc_ioctl_start(void __user *user_area)
 	snprintf(dbf, sizeof(dbf), "ret:%d", ret);
 	CHSC_LOG(0, dbf);
 	kfree(request);
-	free_page((unsigned long)chsc_area);
+	kfree(chsc_area);
 	return ret;
 }
 
@@ -340,7 +341,7 @@ static int chsc_ioctl_on_close_set(void __user *user_area)
 		ret = -ENOMEM;
 		goto out_unlock;
 	}
-	on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
+	on_close_chsc_area = kzalloc(PAGE_SIZE, GFP_DMA | GFP_KERNEL);
 	if (!on_close_chsc_area) {
 		ret = -ENOMEM;
 		goto out_free_request;
@@ -353,7 +354,7 @@ static int chsc_ioctl_on_close_set(void __user *user_area)
 	goto out_unlock;
 
 out_free_chsc:
-	free_page((unsigned long)on_close_chsc_area);
+	kfree(on_close_chsc_area);
 	on_close_chsc_area = NULL;
 out_free_request:
 	kfree(on_close_request);
@@ -375,7 +376,7 @@ static int chsc_ioctl_on_close_remove(void)
 		ret = -ENOENT;
 		goto out_unlock;
 	}
-	free_page((unsigned long)on_close_chsc_area);
+	kfree(on_close_chsc_area);
 	on_close_chsc_area = NULL;
 	kfree(on_close_request);
 	on_close_request = NULL;
@@ -389,39 +390,29 @@ static int chsc_ioctl_on_close_remove(void)
 
 static int chsc_ioctl_start_sync(void __user *user_area)
 {
-	struct chsc_sync_area *chsc_area;
-	int ret, ccode;
+	struct chsc_sync_area *chsc_area __free(kfree) = NULL;
+	int ccode;
 
-	chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	chsc_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 	if (!chsc_area)
 		return -ENOMEM;
-	if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
-		ret = -EFAULT;
-		goto out_free;
-	}
-	if (chsc_area->header.code & 0x4000) {
-		ret = -EINVAL;
-		goto out_free;
-	}
+	if (copy_from_user(chsc_area, user_area, PAGE_SIZE))
+		return -EFAULT;
+	if (chsc_area->header.code & 0x4000)
+		return -EINVAL;
 	chsc_log_command(chsc_area);
 	ccode = chsc(chsc_area);
-	if (ccode != 0) {
-		ret = -EIO;
-		goto out_free;
-	}
+	if (ccode != 0)
+		return -EIO;
 	if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
-		ret = -EFAULT;
-	else
-		ret = 0;
-out_free:
-	free_page((unsigned long)chsc_area);
-	return ret;
+		return -EFAULT;
+	return 0;
 }
 
 static int chsc_ioctl_info_channel_path(void __user *user_cd)
 {
-	struct chsc_chp_cd *cd;
-	int ret, ccode;
+	struct chsc_chp_cd *cd __free(kfree) = NULL;
+	int ccode;
 	struct {
 		struct chsc_header request;
 		u32 : 2;
@@ -436,20 +427,16 @@ static int chsc_ioctl_info_channel_path(void __user *user_cd)
 		u32 : 32;
 		struct chsc_header response;
 		u8 data[PAGE_SIZE - 20];
-	} __attribute__ ((packed)) *scpcd_area;
+	} __attribute__ ((packed)) *scpcd_area __free(kfree) = NULL;
 
-	scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	scpcd_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 	if (!scpcd_area)
 		return -ENOMEM;
 	cd = kzalloc_obj(*cd);
-	if (!cd) {
-		ret = -ENOMEM;
-		goto out_free;
-	}
-	if (copy_from_user(cd, user_cd, sizeof(*cd))) {
-		ret = -EFAULT;
-		goto out_free;
-	}
+	if (!cd)
+		return -ENOMEM;
+	if (copy_from_user(cd, user_cd, sizeof(*cd)))
+		return -EFAULT;
 	scpcd_area->request.length = 0x0010;
 	scpcd_area->request.code = 0x0028;
 	scpcd_area->m = cd->m;
@@ -459,31 +446,23 @@ static int chsc_ioctl_info_channel_path(void __user *user_cd)
 	scpcd_area->last_chpid = cd->chpid.id;
 
 	ccode = chsc(scpcd_area);
-	if (ccode != 0) {
-		ret = -EIO;
-		goto out_free;
-	}
+	if (ccode != 0)
+		return -EIO;
 	if (scpcd_area->response.code != 0x0001) {
-		ret = -EIO;
 		CHSC_MSG(0, "scpcd: response code=%x\n",
 			 scpcd_area->response.code);
-		goto out_free;
+		return -EIO;
 	}
 	memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
 	if (copy_to_user(user_cd, cd, sizeof(*cd)))
-		ret = -EFAULT;
-	else
-		ret = 0;
-out_free:
-	kfree(cd);
-	free_page((unsigned long)scpcd_area);
-	return ret;
+		return -EFAULT;
+	return 0;
 }
 
 static int chsc_ioctl_info_cu(void __user *user_cd)
 {
-	struct chsc_cu_cd *cd;
-	int ret, ccode;
+	struct chsc_cu_cd *cd __free(kfree) = NULL;
+	int ccode;
 	struct {
 		struct chsc_header request;
 		u32 : 2;
@@ -498,20 +477,16 @@ static int chsc_ioctl_info_cu(void __user *user_cd)
 		u32 : 32;
 		struct chsc_header response;
 		u8 data[PAGE_SIZE - 20];
-	} __attribute__ ((packed)) *scucd_area;
+	} __attribute__ ((packed)) *scucd_area __free(kfree) = NULL;
 
-	scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	scucd_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 	if (!scucd_area)
 		return -ENOMEM;
 	cd = kzalloc_obj(*cd);
-	if (!cd) {
-		ret = -ENOMEM;
-		goto out_free;
-	}
-	if (copy_from_user(cd, user_cd, sizeof(*cd))) {
-		ret = -EFAULT;
-		goto out_free;
-	}
+	if (!cd)
+		return -ENOMEM;
+	if (copy_from_user(cd, user_cd, sizeof(*cd)))
+		return -EFAULT;
 	scucd_area->request.length = 0x0010;
 	scucd_area->request.code = 0x0026;
 	scucd_area->m = cd->m;
@@ -521,31 +496,23 @@ static int chsc_ioctl_info_cu(void __user *user_cd)
 	scucd_area->last_cun = cd->cun;
 
 	ccode = chsc(scucd_area);
-	if (ccode != 0) {
-		ret = -EIO;
-		goto out_free;
-	}
+	if (ccode != 0)
+		return -EIO;
 	if (scucd_area->response.code != 0x0001) {
-		ret = -EIO;
 		CHSC_MSG(0, "scucd: response code=%x\n",
 			 scucd_area->response.code);
-		goto out_free;
+		return -EIO;
 	}
 	memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
 	if (copy_to_user(user_cd, cd, sizeof(*cd)))
-		ret = -EFAULT;
-	else
-		ret = 0;
-out_free:
-	kfree(cd);
-	free_page((unsigned long)scucd_area);
-	return ret;
+		return -EFAULT;
+	return 0;
 }
 
 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 {
-	struct chsc_sch_cud *cud;
-	int ret, ccode;
+	struct chsc_sch_cud *cud __free(kfree) = NULL;
+	int ccode;
 	struct {
 		struct chsc_header request;
 		u32 : 2;
@@ -561,20 +528,16 @@ static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 		u32 : 32;
 		struct chsc_header response;
 		u8 data[PAGE_SIZE - 20];
-	} __attribute__ ((packed)) *sscud_area;
+	} __attribute__ ((packed)) *sscud_area __free(kfree) = NULL;
 
-	sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	sscud_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 	if (!sscud_area)
 		return -ENOMEM;
 	cud = kzalloc_obj(*cud);
-	if (!cud) {
-		ret = -ENOMEM;
-		goto out_free;
-	}
-	if (copy_from_user(cud, user_cud, sizeof(*cud))) {
-		ret = -EFAULT;
-		goto out_free;
-	}
+	if (!cud)
+		return -ENOMEM;
+	if (copy_from_user(cud, user_cud, sizeof(*cud)))
+		return -EFAULT;
 	sscud_area->request.length = 0x0010;
 	sscud_area->request.code = 0x0006;
 	sscud_area->m = cud->schid.m;
@@ -585,31 +548,23 @@ static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 	sscud_area->last_sch = cud->schid.sch_no;
 
 	ccode = chsc(sscud_area);
-	if (ccode != 0) {
-		ret = -EIO;
-		goto out_free;
-	}
+	if (ccode != 0)
+		return -EIO;
 	if (sscud_area->response.code != 0x0001) {
-		ret = -EIO;
 		CHSC_MSG(0, "sscud: response code=%x\n",
 			 sscud_area->response.code);
-		goto out_free;
+		return -EIO;
 	}
 	memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
 	if (copy_to_user(user_cud, cud, sizeof(*cud)))
-		ret = -EFAULT;
-	else
-		ret = 0;
-out_free:
-	kfree(cud);
-	free_page((unsigned long)sscud_area);
-	return ret;
+		return -EFAULT;
+	return 0;
 }
 
 static int chsc_ioctl_conf_info(void __user *user_ci)
 {
-	struct chsc_conf_info *ci;
-	int ret, ccode;
+	struct chsc_conf_info *ci __free(kfree) = NULL;
+	int ccode;
 	struct {
 		struct chsc_header request;
 		u32 : 2;
@@ -623,20 +578,16 @@ static int chsc_ioctl_conf_info(void __user *user_ci)
 		u64 : 64;
 		struct chsc_header response;
 		u8 data[PAGE_SIZE - 20];
-	} __attribute__ ((packed)) *sci_area;
+	} __attribute__ ((packed)) *sci_area __free(kfree) = NULL;
 
-	sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	sci_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 	if (!sci_area)
 		return -ENOMEM;
 	ci = kzalloc_obj(*ci);
-	if (!ci) {
-		ret = -ENOMEM;
-		goto out_free;
-	}
-	if (copy_from_user(ci, user_ci, sizeof(*ci))) {
-		ret = -EFAULT;
-		goto out_free;
-	}
+	if (!ci)
+		return -ENOMEM;
+	if (copy_from_user(ci, user_ci, sizeof(*ci)))
+		return -EFAULT;
 	sci_area->request.length = 0x0010;
 	sci_area->request.code = 0x0012;
 	sci_area->m = ci->id.m;
@@ -645,31 +596,23 @@ static int chsc_ioctl_conf_info(void __user *user_ci)
 	sci_area->ssid = ci->id.ssid;
 
 	ccode = chsc(sci_area);
-	if (ccode != 0) {
-		ret = -EIO;
-		goto out_free;
-	}
+	if (ccode != 0)
+		return -EIO;
 	if (sci_area->response.code != 0x0001) {
-		ret = -EIO;
 		CHSC_MSG(0, "sci: response code=%x\n",
 			 sci_area->response.code);
-		goto out_free;
+		return -EIO;
 	}
 	memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
 	if (copy_to_user(user_ci, ci, sizeof(*ci)))
-		ret = -EFAULT;
-	else
-		ret = 0;
-out_free:
-	kfree(ci);
-	free_page((unsigned long)sci_area);
-	return ret;
+		return -EFAULT;
+	return 0;
 }
 
 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 {
-	struct chsc_comp_list *ccl;
-	int ret, ccode;
+	struct chsc_comp_list *ccl __free(kfree) = NULL;
+	int ccode;
 	struct {
 		struct chsc_header request;
 		u32 ctype : 8;
@@ -681,7 +624,7 @@ static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 		u64 : 64;
 		struct chsc_header response;
 		u8 data[PAGE_SIZE - 36];
-	} __attribute__ ((packed)) *sccl_area;
+	} __attribute__ ((packed)) *sccl_area __free(kfree) = NULL;
 	struct {
 		u32 m : 1;
 		u32 : 31;
@@ -696,18 +639,14 @@ static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 		u32 res;
 	} __attribute__ ((packed)) *cssids_parm;
 
-	sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	sccl_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 	if (!sccl_area)
 		return -ENOMEM;
 	ccl = kzalloc_obj(*ccl);
-	if (!ccl) {
-		ret = -ENOMEM;
-		goto out_free;
-	}
-	if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
-		ret = -EFAULT;
-		goto out_free;
-	}
+	if (!ccl)
+		return -ENOMEM;
+	if (copy_from_user(ccl, user_ccl, sizeof(*ccl)))
+		return -EFAULT;
 	sccl_area->request.length = 0x0020;
 	sccl_area->request.code = 0x0030;
 	sccl_area->fmt = ccl->req.fmt;
@@ -728,61 +667,46 @@ static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 		break;
 	}
 	ccode = chsc(sccl_area);
-	if (ccode != 0) {
-		ret = -EIO;
-		goto out_free;
-	}
+	if (ccode != 0)
+		return -EIO;
 	if (sccl_area->response.code != 0x0001) {
-		ret = -EIO;
 		CHSC_MSG(0, "sccl: response code=%x\n",
 			 sccl_area->response.code);
-		goto out_free;
+		return -EIO;
 	}
 	memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
 	if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
-		ret = -EFAULT;
-	else
-		ret = 0;
-out_free:
-	kfree(ccl);
-	free_page((unsigned long)sccl_area);
-	return ret;
+		return -EFAULT;
+	return 0;
 }
 
 static int chsc_ioctl_chpd(void __user *user_chpd)
 {
-	struct chsc_scpd *scpd_area;
-	struct chsc_cpd_info *chpd;
+	struct chsc_scpd *scpd_area __free(kfree) = NULL;
+	struct chsc_cpd_info *chpd __free(kfree) = NULL;
 	int ret;
 
 	chpd = kzalloc_obj(*chpd);
-	scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
-	if (!scpd_area || !chpd) {
-		ret = -ENOMEM;
-		goto out_free;
-	}
-	if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
-		ret = -EFAULT;
-		goto out_free;
-	}
+	scpd_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
+	if (!scpd_area || !chpd)
+		return -ENOMEM;
+	if (copy_from_user(chpd, user_chpd, sizeof(*chpd)))
+		return -EFAULT;
 	ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
 					       chpd->rfmt, chpd->c, chpd->m,
 					       scpd_area);
 	if (ret)
-		goto out_free;
+		return ret;
 	memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
 	if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
-		ret = -EFAULT;
-out_free:
-	kfree(chpd);
-	free_page((unsigned long)scpd_area);
-	return ret;
+		return -EFAULT;
+	return 0;
 }
 
 static int chsc_ioctl_dcal(void __user *user_dcal)
 {
-	struct chsc_dcal *dcal;
-	int ret, ccode;
+	struct chsc_dcal *dcal __free(kfree) = NULL;
+	int ccode;
 	struct {
 		struct chsc_header request;
 		u32 atype : 8;
@@ -794,20 +718,16 @@ static int chsc_ioctl_dcal(void __user *user_dcal)
 		u32 res1[2];
 		struct chsc_header response;
 		u8 data[PAGE_SIZE - 36];
-	} __attribute__ ((packed)) *sdcal_area;
+	} __attribute__ ((packed)) *sdcal_area __free(kfree) = NULL;
 
-	sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	sdcal_area = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 	if (!sdcal_area)
 		return -ENOMEM;
 	dcal = kzalloc_obj(*dcal);
-	if (!dcal) {
-		ret = -ENOMEM;
-		goto out_free;
-	}
-	if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
-		ret = -EFAULT;
-		goto out_free;
-	}
+	if (!dcal)
+		return -ENOMEM;
+	if (copy_from_user(dcal, user_dcal, sizeof(*dcal)))
+		return -EFAULT;
 	sdcal_area->request.length = 0x0020;
 	sdcal_area->request.code = 0x0034;
 	sdcal_area->atype = dcal->req.atype;
@@ -816,26 +736,18 @@ static int chsc_ioctl_dcal(void __user *user_dcal)
 	       sizeof(sdcal_area->list_parm));
 
 	ccode = chsc(sdcal_area);
-	if (ccode != 0) {
-		ret = -EIO;
-		goto out_free;
-	}
+	if (ccode != 0)
+		return -EIO;
 	if (sdcal_area->response.code != 0x0001) {
-		ret = -EIO;
 		CHSC_MSG(0, "sdcal: response code=%x\n",
 			 sdcal_area->response.code);
-		goto out_free;
+		return -EIO;
 	}
 	memcpy(&dcal->sdcal, &sdcal_area->response,
 	       sdcal_area->response.length);
 	if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
-		ret = -EFAULT;
-	else
-		ret = 0;
-out_free:
-	kfree(dcal);
-	free_page((unsigned long)sdcal_area);
-	return ret;
+		return -EFAULT;
+	return 0;
 }
 
 static long chsc_ioctl(struct file *filp, unsigned int cmd,
@@ -904,7 +816,7 @@ static int chsc_release(struct inode *inode, struct file *filp)
 	}
 	snprintf(dbf, sizeof(dbf), "relret:%d", ret);
 	CHSC_LOG(0, dbf);
-	free_page((unsigned long)on_close_chsc_area);
+	kfree(on_close_chsc_area);
 	on_close_chsc_area = NULL;
 	kfree(on_close_request);
 	on_close_request = NULL;
diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c
index 92ab3d546fe47..6c46b0d0b3da4 100644
--- a/drivers/s390/cio/cmf.c
+++ b/drivers/s390/cio/cmf.c
@@ -501,12 +501,12 @@ static int alloc_cmb(struct ccw_device *cdev)
 		WARN_ON(!list_empty(&cmb_area.list));
 
 		spin_unlock(&cmb_area.lock);
-		mem = (void *)__get_free_pages(GFP_KERNEL, get_order(size));
+		mem = kmalloc(PAGE_SIZE << get_order(size), GFP_KERNEL);
 		spin_lock(&cmb_area.lock);
 
 		if (cmb_area.mem) {
 			/* ok, another thread was faster */
-			free_pages((unsigned long)mem, get_order(size));
+			kfree(mem);
 		} else if (!mem) {
 			/* no luck */
 			ret = -ENOMEM;
@@ -547,10 +547,8 @@ static void free_cmb(struct ccw_device *cdev)
 	list_del_init(&priv->cmb_list);
 
 	if (list_empty(&cmb_area.list)) {
-		ssize_t size;
-		size = sizeof(struct cmb) * cmb_area.num_channels;
 		cmf_activate(NULL, CMF_OFF);
-		free_pages((unsigned long)cmb_area.mem, get_order(size));
+		kfree(cmb_area.mem);
 		cmb_area.mem = NULL;
 	}
 	spin_unlock_irq(cdev->ccwlock);
diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h
index 4bd4c00c9c0ca..dff5f53a8795d 100644
--- a/drivers/s390/cio/qdio.h
+++ b/drivers/s390/cio/qdio.h
@@ -244,7 +244,7 @@ struct qdio_irq {
 	int perf_stat_enabled;
 
 	struct qdr *qdr;
-	unsigned long chsc_page;
+	void *chsc_page;
 
 	struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
 	struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index c1e09fa34e774..bebc1250ebebf 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -17,6 +17,7 @@
 #include <linux/gfp.h>
 #include <linux/io.h>
 #include <linux/atomic.h>
+#include <linux/slab.h>
 #include <asm/debug.h>
 #include <asm/qdio.h>
 #include <asm/asm.h>
@@ -933,10 +934,10 @@ int qdio_free(struct ccw_device *cdev)
 	mutex_unlock(&irq_ptr->setup_mutex);
 
 	qdio_free_queues(irq_ptr);
-	free_page((unsigned long) irq_ptr->qdr);
-	free_page(irq_ptr->chsc_page);
+	kfree(irq_ptr->qdr);
+	kfree(irq_ptr->chsc_page);
 	kfree(irq_ptr->ccw);
-	free_page((unsigned long) irq_ptr);
+	kfree(irq_ptr);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(qdio_free);
@@ -961,7 +962,7 @@ int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
 	    no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)
 		return -EINVAL;
 
-	irq_ptr = (void *) get_zeroed_page(GFP_KERNEL);
+	irq_ptr = kzalloc(PAGE_SIZE, GFP_KERNEL);
 	if (!irq_ptr)
 		return -ENOMEM;
 
@@ -986,12 +987,12 @@ int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
 	 * qdio_establish. In case of low memory and swap on a zfcp disk
 	 * we may not be able to allocate memory otherwise.
 	 */
-	irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
+	irq_ptr->chsc_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
 	if (!irq_ptr->chsc_page)
 		goto err_chsc;
 
 	/* qdr is used in ccw1.cda which is u32 */
-	irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	irq_ptr->qdr = kzalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 	if (!irq_ptr->qdr)
 		goto err_qdr;
 
@@ -1004,14 +1005,14 @@ int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
 	return 0;
 
 err_queues:
-	free_page((unsigned long) irq_ptr->qdr);
+	kfree(irq_ptr->qdr);
 err_qdr:
-	free_page(irq_ptr->chsc_page);
+	kfree(irq_ptr->chsc_page);
 err_chsc:
 err_dbf:
 	kfree(irq_ptr->ccw);
 err_ccw:
-	free_page((unsigned long) irq_ptr);
+	kfree(irq_ptr);
 	return rc;
 }
 EXPORT_SYMBOL_GPL(qdio_allocate);
diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c
index ea09aadaae4ec..c0215a7d29a81 100644
--- a/drivers/s390/cio/qdio_setup.c
+++ b/drivers/s390/cio/qdio_setup.c
@@ -35,7 +35,7 @@ void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)
 	int pos;
 
 	for (pos = 0; pos < count; pos += QBUFF_PER_PAGE)
-		free_page((unsigned long) buf[pos]);
+		kfree(buf[pos]);
 }
 EXPORT_SYMBOL_GPL(qdio_free_buffers);
 
@@ -49,7 +49,7 @@ int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)
 	int pos;
 
 	for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) {
-		buf[pos] = (void *) get_zeroed_page(GFP_KERNEL);
+		buf[pos] = kzalloc(PAGE_SIZE, GFP_KERNEL);
 		if (!buf[pos]) {
 			qdio_free_buffers(buf, count);
 			return -ENOMEM;
@@ -83,7 +83,7 @@ static void __qdio_free_queues(struct qdio_q **queues, unsigned int count)
 
 	for (i = 0; i < count; i++) {
 		q = queues[i];
-		free_page((unsigned long)q->sl_page);
+		kfree(q->sl_page);
 		kmem_cache_free(qdio_q_cache, q);
 	}
 }
@@ -109,7 +109,7 @@ static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
 			return -ENOMEM;
 		}
 
-		q->sl_page = (void *)__get_free_page(GFP_KERNEL);
+		q->sl_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
 		if (!q->sl_page) {
 			kmem_cache_free(qdio_q_cache, q);
 			__qdio_free_queues(irq_ptr_qs, i);
@@ -249,11 +249,11 @@ int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 
 	DBF_EVENT("getssqd:%4x", schid->sch_no);
 	if (!irq_ptr) {
-		ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
+		ssqd = kzalloc(PAGE_SIZE, GFP_KERNEL);
 		if (!ssqd)
 			return -ENOMEM;
 	} else {
-		ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
+		ssqd = irq_ptr->chsc_page;
 	}
 
 	rc = chsc_ssqd(*schid, ssqd);
@@ -270,7 +270,7 @@ int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 
 out:
 	if (!irq_ptr)
-		free_page((unsigned long)ssqd);
+		kfree(ssqd);
 
 	return rc;
 }
diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c
index e167aa75c3dff..a2ff51887537f 100644
--- a/drivers/s390/cio/qdio_thinint.c
+++ b/drivers/s390/cio/qdio_thinint.c
@@ -136,7 +136,7 @@ static struct airq_struct tiqdio_airq = {
 
 static int set_subchannel_ind(struct qdio_irq *irq_ptr, int reset)
 {
-	struct chsc_scssc_area *scssc = (void *)irq_ptr->chsc_page;
+	struct chsc_scssc_area *scssc = irq_ptr->chsc_page;
 	dma64_t summary_indicator_addr, subchannel_indicator_addr;
 	int rc;
 
diff --git a/drivers/s390/cio/scm.c b/drivers/s390/cio/scm.c
index 171212a6d2d9c..b79fe023ab8d1 100644
--- a/drivers/s390/cio/scm.c
+++ b/drivers/s390/cio/scm.c
@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/err.h>
+#include <linux/cleanup.h>
 #include <asm/eadm.h>
 #include "chsc.h"
 
@@ -224,12 +225,12 @@ static int scm_add(struct chsc_scm_info *scm_info, size_t num)
 
 int scm_update_information(void)
 {
-	struct chsc_scm_info *scm_info;
+	struct chsc_scm_info *scm_info __free(kfree) = NULL;
 	u64 token = 0;
 	size_t num;
 	int ret;
 
-	scm_info = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
+	scm_info = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 	if (!scm_info)
 		return -ENOMEM;
 
@@ -250,8 +251,6 @@ int scm_update_information(void)
 		token = scm_info->restok;
 	} while (token);
 
-	free_page((unsigned long)scm_info);
-
 	return ret;
 }
 

gemini-3.7-flash

null

null

							input: 14328
							output: 20
							thoughts: 314
						

**Analyzing the Patch for AMD64 Compatibility**

Okay, let's break this down. First, I need to understand what this patch is doing and if it has any relevance to the `amd64` architecture I'm working with. The target architecture is clearly specified as `amd64`, so that's the focus. Now, let's look at the modified files.

Hmm, interesting. It seems this patch is entirely focused on the `s390` architecture, judging by the file paths. I see `arch/s390/include/asm/idals.h` which is an `s390` specific header, and a whole slew of files within the `drivers/s390/cio/` directory. These are all related to the `s390` CIO driver.

My immediate concern is whether any of this `s390` code is even compiled or reachable on an `amd64` system. It's highly unlikely, but I need to confirm. I should grep the `Kconfig` and `Makefile` files to see if any of these `s390` drivers are conditionally compiled for `amd64` or included in some general build process. This is the crux of the issue; it's a straightforward check, and will tell me whether I need to pay any further attention to this patch in the context of my `amd64` work.

{
  "Expression": "drivers/s390"
}

{
  "Output": "Documentation/admin-guide/kernel-parameters.txt=98=Kernel parameters\n--\nDocumentation/admin-guide/kernel-parameters.txt-1138-\tdasd=\t\t[HW,NET]\nDocumentation/admin-guide/kernel-parameters.txt:1139:\t\t\tSee header of drivers/s390/block/dasd_devmap.c.\nDocumentation/admin-guide/kernel-parameters.txt-1140-\n--\nDocumentation/arch/s390/vfio-ap-locking.rst=8=will be used to denote instances of the structures herein described:\n--\nDocumentation/arch/s390/vfio-ap-locking.rst-15-\nDocumentation/arch/s390/vfio-ap-locking.rst:16:The Matrix Devices Lock (drivers/s390/crypto/vfio_ap_private.h)\nDocumentation/arch/s390/vfio-ap-locking.rst-17----------------------------------------------------------------\n--\nDocumentation/arch/s390/vfio-ap-locking.rst=52=been attached to the KVM guest.\nDocumentation/arch/s390/vfio-ap-locking.rst-53-\nDocumentation/arch/s390/vfio-ap-locking.rst:54:The Guests Lock (drivers/s390/crypto/vfio_ap_private.h)\nDocumentation/arch/s390/vfio-ap-locking.rst-55------------------------------------------------------------\n--\nDocumentation/driver-api/s390-drivers.rst=79=strange side effects may happen.\n--\nDocumentation/driver-api/s390-drivers.rst-83-\nDocumentation/driver-api/s390-drivers.rst:84:.. kernel-doc:: drivers/s390/cio/device.c\nDocumentation/driver-api/s390-drivers.rst-85-   :export:\nDocumentation/driver-api/s390-drivers.rst-86-\nDocumentation/driver-api/s390-drivers.rst:87:.. kernel-doc:: drivers/s390/cio/device_ops.c\nDocumentation/driver-api/s390-drivers.rst-88-   :export:\n--\nDocumentation/driver-api/s390-drivers.rst=95=attached device.\n--\nDocumentation/driver-api/s390-drivers.rst-99-\nDocumentation/driver-api/s390-drivers.rst:100:.. kernel-doc:: drivers/s390/cio/cmf.c\nDocumentation/driver-api/s390-drivers.rst-101-   :export:\n--\nDocumentation/driver-api/s390-drivers.rst=112=ccw group devices\n--\nDocumentation/driver-api/s390-drivers.rst-117-\nDocumentation/driver-api/s390-drivers.rst:118:.. kernel-doc:: drivers/s390/cio/ccwgroup.c\nDocumentation/driver-api/s390-drivers.rst-119-   :export:\n--\nDocumentation/driver-api/s390-drivers.rst=132=interrupts and interrupt vectors.\nDocumentation/driver-api/s390-drivers.rst-133-\nDocumentation/driver-api/s390-drivers.rst:134:.. kernel-doc:: drivers/s390/cio/airq.c\nDocumentation/driver-api/s390-drivers.rst-135-   :export:\n--\nDocumentation/filesystems/porting.rst=271=Use bdev_read_only(bdev) instead of is_read_only(kdev).  The latter\nDocumentation/filesystems/porting.rst:272:is still alive, but only because of the mess in drivers/s390/block/dasd.c.\nDocumentation/filesystems/porting.rst-273-As soon as it gets fixed is_read_only() will die.\n--\nDocumentation/userspace-api/ioctl/ioctl-number.rst=73=Code  Seq#    Include File                                             Comments\n--\nDocumentation/userspace-api/ioctl/ioctl-number.rst-110-'2'   01-04  linux/i2o.h\nDocumentation/userspace-api/ioctl/ioctl-number.rst:111:'3'   00-0F  drivers/s390/char/raw3270.h                               conflict!\nDocumentation/userspace-api/ioctl/ioctl-number.rst-112-'3'   00-1F  linux/suspend_ioctls.h,                                   conflict!\n--\nDocumentation/userspace-api/ioctl/ioctl-number.rst-314-                                                                       \u003cmailto:oe@port.de\u003e\nDocumentation/userspace-api/ioctl/ioctl-number.rst:315:'z'   10-4F  drivers/s390/crypto/zcrypt_api.h                          conflict!\nDocumentation/userspace-api/ioctl/ioctl-number.rst-316-'|'   00-7F  linux/media.h\n--\nDocumentation/userspace-api/ioctl/ioctl-number.rst-398-0xCF  02     fs/smb/client/cifs_ioctl.h\nDocumentation/userspace-api/ioctl/ioctl-number.rst:399:0xDD  00-3F                                                            ZFCP device driver see drivers/s390/scsi/\nDocumentation/userspace-api/ioctl/ioctl-number.rst-400-                                                                       \u003cmailto:aherrman@de.ibm.com\u003e\n--\nMAINTAINERS=14388=F:\tarch/s390/mm/gmap_helpers.c\nMAINTAINERS:14389:F:\tdrivers/s390/char/uvdevice.c\nMAINTAINERS:14390:F:\ttools/testing/selftests/drivers/s390x/uvdevice/\nMAINTAINERS-14391-F:\ttools/testing/selftests/kvm/*/s390/\n--\nMAINTAINERS=18902=F:\tdrivers/ptp/\nMAINTAINERS:18903:F:\tdrivers/s390/net/\nMAINTAINERS-18904-F:\tinclude/dt-bindings/net/\n--\nMAINTAINERS=24077=F:\tdrivers/cpuidle/cpuidle-s390.c\nMAINTAINERS:24078:F:\tdrivers/s390/\nMAINTAINERS-24079-F:\tdrivers/watchdog/diag288_wdt.c\n--\nMAINTAINERS=24085=S:\tSupported\nMAINTAINERS:24086:F:\tdrivers/s390/cio/\nMAINTAINERS-24087-\n--\nMAINTAINERS=24103=F:\tblock/partitions/ibm.c\nMAINTAINERS:24104:F:\tdrivers/s390/block/dasd*\nMAINTAINERS-24105-F:\tinclude/linux/dasd_mod.h\n--\nMAINTAINERS=24128=S:\tSupported\nMAINTAINERS:24129:F:\tdrivers/s390/net/*iucv*\nMAINTAINERS-24130-F:\tinclude/net/iucv/\n--\nMAINTAINERS=24147=S:\tSupported\nMAINTAINERS:24148:F:\tdrivers/s390/net/\nMAINTAINERS-24149-\n--\nMAINTAINERS=24168=S:\tSupported\nMAINTAINERS:24169:F:\tdrivers/s390/block/scm*\nMAINTAINERS:24170:F:\tdrivers/s390/cio/scm.c\nMAINTAINERS-24171-\n--\nMAINTAINERS=24180=F:\tDocumentation/arch/s390/vfio-ap*\nMAINTAINERS:24181:F:\tdrivers/s390/crypto/vfio_ap*\nMAINTAINERS-24182-\n--\nMAINTAINERS=24191=F:\tDocumentation/arch/s390/vfio-ccw.rst\nMAINTAINERS:24192:F:\tdrivers/s390/cio/vfio_ccw*\nMAINTAINERS-24193-F:\tinclude/uapi/linux/vfio_ccw.h\n--\nMAINTAINERS=24216=F:\tarch/s390/include/uapi/asm/zcrypt.h\nMAINTAINERS:24217:F:\tdrivers/s390/crypto/\nMAINTAINERS-24218-\n--\nMAINTAINERS=24222=S:\tSupported\nMAINTAINERS:24223:F:\tdrivers/s390/scsi/zfcp_*\nMAINTAINERS-24224-\n--\nMAINTAINERS=28914=F:\tarch/s390/include/uapi/asm/virtio-ccw.h\nMAINTAINERS:28915:F:\tdrivers/s390/virtio/\nMAINTAINERS-28916-\n--\narch/s390/boot/Makefile=24=KBUILD_CFLAGS += $(call cc-option, -Wno-default-const-init-unsafe)\narch/s390/boot/Makefile-25-\narch/s390/boot/Makefile:26:CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char\narch/s390/boot/Makefile-27-\n--\narch/s390/boot/sclp_early_core.c-2-#include \"boot.h\"\narch/s390/boot/sclp_early_core.c:3:#include \"../../../drivers/s390/char/sclp_early_core.c\"\narch/s390/boot/sclp_early_core.c-4-\n--\narch/s390/include/asm/cio.h=374=struct gen_pool *cio_gp_dma_create(struct device *dma_dev, int nr_pages);\narch/s390/include/asm/cio.h-375-\narch/s390/include/asm/cio.h:376:/* Function from drivers/s390/cio/chsc.c */\narch/s390/include/asm/cio.h-377-int chsc_sstpc(void *page, unsigned int op, u16 ctrl, long *clock_delta);\n--\narch/s390/mm/cmm.c=31=MODULE_PARM_DESC(sender,\n--\narch/s390/mm/cmm.c-33-\narch/s390/mm/cmm.c:34:#include \"../../../drivers/s390/net/smsgiucv.h\"\narch/s390/mm/cmm.c-35-\n--\ndrivers/block/Kconfig=267=config SUNVDC\n--\ndrivers/block/Kconfig-273-\ndrivers/block/Kconfig:274:source \"drivers/s390/block/Kconfig\"\ndrivers/block/Kconfig-275-\n--\ndrivers/char/Kconfig=345=config TELCLOCK\n--\ndrivers/char/Kconfig-357-\ndrivers/char/Kconfig:358:source \"drivers/s390/char/Kconfig\"\ndrivers/char/Kconfig-359-\n--\ndrivers/net/Kconfig=530=source \"drivers/net/slip/Kconfig\"\ndrivers/net/Kconfig-531-\ndrivers/net/Kconfig:532:source \"drivers/s390/net/Kconfig\"\ndrivers/net/Kconfig-533-\n--\ndrivers/s390/block/dasd_diag.c-3- * Author(s)......: Holger Smolinski \u003cHolger.Smolinski@de.ibm.com\u003e\ndrivers/s390/block/dasd_diag.c:4: * Based on.......: linux/drivers/s390/block/mdisk.c\ndrivers/s390/block/dasd_diag.c-5- * ...............: by Hartmunt Penner \u003chpenner@de.ibm.com\u003e\n--\ndrivers/s390/block/dasd_diag.h-3- * Author(s)......: Holger Smolinski \u003cHolger.Smolinski@de.ibm.com\u003e\ndrivers/s390/block/dasd_diag.h:4: * Based on.......: linux/drivers/s390/block/mdisk.h\ndrivers/s390/block/dasd_diag.h-5- * ...............: by Hartmunt Penner \u003chpenner@de.ibm.com\u003e\n--\ninclude/net/iucv/iucv.h-2-/*\ninclude/net/iucv/iucv.h:3: *  drivers/s390/net/iucv.h\ninclude/net/iucv/iucv.h-4- *    IUCV base support.\n--\ntools/testing/selftests/Makefile=23=TARGETS += drivers/ntsync\ntools/testing/selftests/Makefile:24:TARGETS += drivers/s390x/uvdevice\ntools/testing/selftests/Makefile-25-TARGETS += drivers/net\n"
}

gemini-3.7-flash

null

null

							input: 18419
							output: 24
							thoughts: 36
						

Here's my take on those files, based on what I see in the prompt:

**Diving into the Driver Infrastructure**

Okay, so we need to get a handle on the driver build process, specifically for s390 architecture and its channel I/O (CIO) subsystem. My first instinct, as always, is to check the `Makefile` structures. I'll need to look at `drivers/Makefile` in the root drivers directory to understand the overall framework and how these s390/CIO drivers fit in. Are there conditional includes? Any generic rules? Then, to zoom in on the specific s390/CIO code, I'll need to examine `drivers/s390/cio/Makefile`. This will tell me what specific source files are being built, any dependencies, and hopefully how they're being linked into the kernel. Alternatively, it's also worth checking `drivers/s390/cio/Kconfig`. Sometimes the build process is heavily influenced by the Kconfig options, and this might give me clues about conditional compilation and feature flags related to this particular driver. It's all about understanding the build environment and how the pieces are put together.

no matches

{
  "Expression": "cio",
  "PathPrefix": "drivers/Makefile"
}

{
  "error": "no matches"
}

gemini-3.7-flash

null

null

							input: 18745
							output: 27
							thoughts: 20
						

Here's a summary of my immediate thought process:

**Diving into the Makefile Jungle**

Okay, so I need to figure out how this driver is being built, or potentially included. My first instinct, given the context, is to jump straight to the source. Given that this is likely a kernel driver, the `Makefile` is the place to be. The default location for drivers is usually under the `drivers/` directory, so I'll start there. And since this seems architecture specific, or at least potentially so, I'll check `drivers/Makefile` first, as that is the general one. Then if that does not contain what I am looking for, I should immediately look in the architecture specific location, so `drivers/s390/Makefile`.

{
  "Expression": "s390",
  "PathPrefix": "drivers/Makefile"
}

{
  "Output": "drivers/Makefile=199=obj-$(CONFIG_DIBS)\t\t+= dibs/\ndrivers/Makefile:200:obj-$(CONFIG_S390)\t\t+= s390/\n"
}

gemini-3.7-flash

null

null

							input: 19014
							output: 28
							thoughts: 257
						

**Analyzing Potential Unreachable Code**

Okay, so I'm looking at this change, and it seems pretty straightforward. The `drivers/Makefile` has added `obj-$(CONFIG_S390) += s390/`, meaning that stuff under `drivers/s390/` is only built if the `CONFIG_S390` option is set. And, from what I'm seeing, `arch/s390/include/asm/idals.h` is *also* only included on the s390 architecture.

Now, let's make sure this doesn't violate the prompt's negative criteria. Specifically, they're worried about unreachable execution paths. The prompt lists a few, but the relevant ones here are code paths exclusive to architectures other than the target architecture, which is amd64.

Given that the target is amd64, and the modified files are all in `arch/s390/` and `drivers/s390/cio/`, and that `CONFIG_S390` is *only* defined for s390, this is pretty clear.

Just to be absolutely certain, I need to double-check that nothing in `drivers/s390/cio` or `arch/s390/include/asm/idals.h` can somehow be compiled or executed on amd64. I'll take a quick look at `drivers/s390/Kconfig` and `drivers/s390/Makefile` to make sure there aren't any sneaky configurations.

{
  "Expression": "cio",
  "PathPrefix": "drivers/s390/"
}

{
  "Output": "\nFull output is too long, showing 500 out of 1759 lines.\nUse more precise expression if possible.\n\ndrivers/s390/Makefile-5-\ndrivers/s390/Makefile:6:obj-y += cio/ block/ char/ crypto/ net/ scsi/ virtio/\n--\ndrivers/s390/block/dasd_eckd.c-30-#include \u003casm/ebcdic.h\u003e\ndrivers/s390/block/dasd_eckd.c:31:#include \u003casm/cio.h\u003e\ndrivers/s390/block/dasd_eckd.c-32-#include \u003casm/ccwdev.h\u003e\n--\ndrivers/s390/char/con3215.c-27-#include \u003casm/ccwdev.h\u003e\ndrivers/s390/char/con3215.c:28:#include \u003casm/cio.h\u003e\ndrivers/s390/char/con3215.c-29-#include \u003clinux/io.h\u003e\n--\ndrivers/s390/char/con3270.c-26-#include \u003casm/ccwdev.h\u003e\ndrivers/s390/char/con3270.c:27:#include \u003casm/cio.h\u003e\ndrivers/s390/char/con3270.c-28-#include \u003casm/ebcdic.h\u003e\n--\ndrivers/s390/char/fs3270.c-22-#include \u003casm/ccwdev.h\u003e\ndrivers/s390/char/fs3270.c:23:#include \u003casm/cio.h\u003e\ndrivers/s390/char/fs3270.c-24-#include \u003casm/ebcdic.h\u003e\n--\ndrivers/s390/char/raw3270.c-22-#include \u003casm/ccwdev.h\u003e\ndrivers/s390/char/raw3270.c:23:#include \u003casm/cio.h\u003e\ndrivers/s390/char/raw3270.c-24-#include \u003casm/ebcdic.h\u003e\n--\ndrivers/s390/char/vmur.c-20-#include \u003casm/machine.h\u003e\ndrivers/s390/char/vmur.c:21:#include \u003casm/cio.h\u003e\ndrivers/s390/char/vmur.c-22-#include \u003casm/ccwdev.h\u003e\n--\ndrivers/s390/cio/Makefile=10=CFLAGS_vfio_ccw_trace.o := -I$(src)\ndrivers/s390/cio/Makefile-11-\ndrivers/s390/cio/Makefile:12:obj-y += airq.o blacklist.o chsc.o cio.o css.o chp.o idset.o isc.o \\\ndrivers/s390/cio/Makefile:13:\tfcx.o itcw.o crw.o ccwreq.o trace.o ioasm.o cio_debugfs.o\ndrivers/s390/cio/Makefile-14-ccw_device-objs += device.o device_fsm.o device_ops.o\n--\ndrivers/s390/cio/Makefile=27=obj-$(CONFIG_VFIO_CCW) += vfio_ccw.o\ndrivers/s390/cio/Makefile-28-\ndrivers/s390/cio/Makefile:29:obj-$(CONFIG_CIO_INJECT) += cio_inject.o\n--\ndrivers/s390/cio/airq.c-23-#include \u003casm/isc.h\u003e\ndrivers/s390/cio/airq.c:24:#include \u003casm/cio.h\u003e\ndrivers/s390/cio/airq.c-25-\ndrivers/s390/cio/airq.c:26:#include \"cio.h\"\ndrivers/s390/cio/airq.c:27:#include \"cio_debug.h\"\ndrivers/s390/cio/airq.c-28-#include \"ioasm.h\"\n--\ndrivers/s390/cio/airq.c=41=int register_adapter_interrupt(struct airq_struct *airq)\n--\ndrivers/s390/cio/airq.c-47-\tif (!airq-\u003elsi_ptr) {\ndrivers/s390/cio/airq.c:48:\t\tairq-\u003elsi_ptr = cio_dma_zalloc(1);\ndrivers/s390/cio/airq.c-49-\t\tif (!airq-\u003elsi_ptr)\n--\ndrivers/s390/cio/airq.c=67=void unregister_adapter_interrupt(struct airq_struct *airq)\n--\ndrivers/s390/cio/airq.c-80-\tif (airq-\u003eflags \u0026 AIRQ_PTR_ALLOCATED) {\ndrivers/s390/cio/airq.c:81:\t\tcio_dma_free(airq-\u003elsi_ptr, 1);\ndrivers/s390/cio/airq.c-82-\t\tairq-\u003elsi_ptr = NULL;\n--\ndrivers/s390/cio/airq.c=88=static irqreturn_t do_airq_interrupt(int irq, void *dummy)\n--\ndrivers/s390/cio/airq.c-94-\ttpi_info = \u0026get_irq_regs()-\u003etpi_info;\ndrivers/s390/cio/airq.c:95:\ttrace_s390_cio_adapter_int(tpi_info);\ndrivers/s390/cio/airq.c-96-\thead = \u0026airq_lists[tpi_info-\u003eisc];\n--\ndrivers/s390/cio/airq.c=127=struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags,\n--\ndrivers/s390/cio/airq.c-151-\t} else {\ndrivers/s390/cio/airq.c:152:\t\tiv-\u003evector = cio_dma_zalloc(size);\ndrivers/s390/cio/airq.c-153-\t\tif (!iv-\u003evector)\n--\ndrivers/s390/cio/airq.c-190-\telse if (!(iv-\u003eflags \u0026 AIRQ_IV_GUESTVEC))\ndrivers/s390/cio/airq.c:191:\t\tcio_dma_free(iv-\u003evector, size);\ndrivers/s390/cio/airq.c-192-\tkfree(iv);\n--\ndrivers/s390/cio/airq.c=202=void airq_iv_release(struct airq_iv *iv)\n--\ndrivers/s390/cio/airq.c-209-\telse if (!(iv-\u003eflags \u0026 AIRQ_IV_GUESTVEC))\ndrivers/s390/cio/airq.c:210:\t\tcio_dma_free(iv-\u003evector, iv_size(iv-\u003ebits));\ndrivers/s390/cio/airq.c-211-\tkfree(iv-\u003eavail);\n--\ndrivers/s390/cio/airq.c=305=int __init airq_init(void)\ndrivers/s390/cio/airq.c-306-{\ndrivers/s390/cio/airq.c:307:\tairq_iv_cache = dma_pool_create(\"airq_iv_cache\", cio_get_dma_css_dev(),\ndrivers/s390/cio/airq.c-308-\t\t\t\t\tcache_line_size(),\n--\ndrivers/s390/cio/blacklist.c-10-\ndrivers/s390/cio/blacklist.c:11:#define pr_fmt(fmt) \"cio: \" fmt\ndrivers/s390/cio/blacklist.c-12-\n--\ndrivers/s390/cio/blacklist.c-21-#include \u003clinux/uaccess.h\u003e\ndrivers/s390/cio/blacklist.c:22:#include \u003casm/cio.h\u003e\ndrivers/s390/cio/blacklist.c-23-#include \u003casm/ipl.h\u003e\n--\ndrivers/s390/cio/blacklist.c-25-#include \"blacklist.h\"\ndrivers/s390/cio/blacklist.c:26:#include \"cio.h\"\ndrivers/s390/cio/blacklist.c:27:#include \"cio_debug.h\"\ndrivers/s390/cio/blacklist.c-28-#include \"css.h\"\n--\ndrivers/s390/cio/blacklist.c-32- * \"Blacklisting\" of certain devices:\ndrivers/s390/cio/blacklist.c:33: * Device numbers given in the commandline as cio_ignore=... won't be known\ndrivers/s390/cio/blacklist.c-34- * to Linux.\n--\ndrivers/s390/cio/blacklist.c=49=static int blacklist_range(range_action action, unsigned int from_ssid,\n--\ndrivers/s390/cio/blacklist.c-54-\t\tif (msgtrigger)\ndrivers/s390/cio/blacklist.c:55:\t\t\tpr_warn(\"0.%x.%04x to 0.%x.%04x is not a valid range for cio_ignore\\n\",\ndrivers/s390/cio/blacklist.c-56-\t\t\t\tfrom_ssid, from, to_ssid, to);\n--\ndrivers/s390/cio/blacklist.c=101=static int parse_busid(char *str, unsigned int *cssid, unsigned int *ssid,\n--\ndrivers/s390/cio/blacklist.c-142-\tif (rc \u0026\u0026 msgtrigger)\ndrivers/s390/cio/blacklist.c:143:\t\tpr_warn(\"%s is not a valid device for the cio_ignore kernel parameter\\n\",\ndrivers/s390/cio/blacklist.c-144-\t\t\tstr);\n--\ndrivers/s390/cio/blacklist.c=227=blacklist_setup (char *str)\n--\ndrivers/s390/cio/blacklist.c-234-\ndrivers/s390/cio/blacklist.c:235:__setup (\"cio_ignore=\", blacklist_setup);\ndrivers/s390/cio/blacklist.c-236-\n--\ndrivers/s390/cio/blacklist.c=246=is_blacklisted (int ssid, int devno)\n--\ndrivers/s390/cio/blacklist.c-253- * Function: blacklist_parse_proc_parameters\ndrivers/s390/cio/blacklist.c:254: * parse the stuff which is piped to /proc/cio_ignore\ndrivers/s390/cio/blacklist.c-255- */\n--\ndrivers/s390/cio/blacklist.c=289=static void *\ndrivers/s390/cio/blacklist.c:290:cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset)\ndrivers/s390/cio/blacklist.c-291-{\n--\ndrivers/s390/cio/blacklist.c=302=static void\ndrivers/s390/cio/blacklist.c:303:cio_ignore_proc_seq_stop(struct seq_file *s, void *it)\ndrivers/s390/cio/blacklist.c-304-{\n--\ndrivers/s390/cio/blacklist.c=307=static void *\ndrivers/s390/cio/blacklist.c:308:cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset)\ndrivers/s390/cio/blacklist.c-309-{\n--\ndrivers/s390/cio/blacklist.c=327=static int\ndrivers/s390/cio/blacklist.c:328:cio_ignore_proc_seq_show(struct seq_file *s, void *it)\ndrivers/s390/cio/blacklist.c-329-{\n--\ndrivers/s390/cio/blacklist.c=357=static ssize_t\ndrivers/s390/cio/blacklist.c:358:cio_ignore_write(struct file *file, const char __user *user_buf,\ndrivers/s390/cio/blacklist.c-359-\t\t size_t user_len, loff_t *offset)\n--\ndrivers/s390/cio/blacklist.c-392-\ndrivers/s390/cio/blacklist.c:393:static const struct seq_operations cio_ignore_proc_seq_ops = {\ndrivers/s390/cio/blacklist.c:394:\t.start = cio_ignore_proc_seq_start,\ndrivers/s390/cio/blacklist.c:395:\t.stop  = cio_ignore_proc_seq_stop,\ndrivers/s390/cio/blacklist.c:396:\t.next  = cio_ignore_proc_seq_next,\ndrivers/s390/cio/blacklist.c:397:\t.show  = cio_ignore_proc_seq_show,\ndrivers/s390/cio/blacklist.c-398-};\n--\ndrivers/s390/cio/blacklist.c=400=static int\ndrivers/s390/cio/blacklist.c:401:cio_ignore_proc_open(struct inode *inode, struct file *file)\ndrivers/s390/cio/blacklist.c-402-{\ndrivers/s390/cio/blacklist.c:403:\treturn seq_open_private(file, \u0026cio_ignore_proc_seq_ops,\ndrivers/s390/cio/blacklist.c-404-\t\t\t\tsizeof(struct ccwdev_iter));\n--\ndrivers/s390/cio/blacklist.c-406-\ndrivers/s390/cio/blacklist.c:407:static const struct proc_ops cio_ignore_proc_ops = {\ndrivers/s390/cio/blacklist.c:408:\t.proc_open\t= cio_ignore_proc_open,\ndrivers/s390/cio/blacklist.c-409-\t.proc_read\t= seq_read,\n--\ndrivers/s390/cio/blacklist.c-411-\t.proc_release\t= seq_release_private,\ndrivers/s390/cio/blacklist.c:412:\t.proc_write\t= cio_ignore_write,\ndrivers/s390/cio/blacklist.c-413-};\n--\ndrivers/s390/cio/blacklist.c=415=static int\ndrivers/s390/cio/blacklist.c:416:cio_ignore_proc_init (void)\ndrivers/s390/cio/blacklist.c-417-{\n--\ndrivers/s390/cio/blacklist.c-419-\ndrivers/s390/cio/blacklist.c:420:\tentry = proc_create(\"cio_ignore\", S_IFREG | S_IRUGO | S_IWUSR, NULL,\ndrivers/s390/cio/blacklist.c:421:\t\t\t    \u0026cio_ignore_proc_ops);\ndrivers/s390/cio/blacklist.c-422-\tif (!entry)\n--\ndrivers/s390/cio/blacklist.c-426-\ndrivers/s390/cio/blacklist.c:427:__initcall (cio_ignore_proc_init);\ndrivers/s390/cio/blacklist.c-428-\n--\ndrivers/s390/cio/ccwgroup.c-20-\ndrivers/s390/cio/ccwgroup.c:21:#include \u003casm/cio.h\u003e\ndrivers/s390/cio/ccwgroup.c-22-#include \u003casm/ccwdev.h\u003e\n--\ndrivers/s390/cio/ccwreq.c-8-\ndrivers/s390/cio/ccwreq.c:9:#define pr_fmt(fmt) \"cio: \" fmt\ndrivers/s390/cio/ccwreq.c-10-\n--\ndrivers/s390/cio/ccwreq.c-13-#include \u003casm/ccwdev.h\u003e\ndrivers/s390/cio/ccwreq.c:14:#include \u003casm/cio.h\u003e\ndrivers/s390/cio/ccwreq.c-15-\ndrivers/s390/cio/ccwreq.c-16-#include \"io_sch.h\"\ndrivers/s390/cio/ccwreq.c:17:#include \"cio.h\"\ndrivers/s390/cio/ccwreq.c-18-#include \"device.h\"\ndrivers/s390/cio/ccwreq.c:19:#include \"cio_debug.h\"\ndrivers/s390/cio/ccwreq.c-20-\n--\ndrivers/s390/cio/ccwreq.c=74=static void ccwreq_do(struct ccw_device *cdev)\n--\ndrivers/s390/cio/ccwreq.c-88-\t\tmemset(\u0026cdev-\u003eprivate-\u003edma_area-\u003eirb, 0, sizeof(struct irb));\ndrivers/s390/cio/ccwreq.c:89:\t\trc = cio_start(sch, cp, (u8) req-\u003emask);\ndrivers/s390/cio/ccwreq.c-90-\t\tif (rc == 0) {\n--\ndrivers/s390/cio/ccwreq.c-104-\t\t/* Temporary improper status. */\ndrivers/s390/cio/ccwreq.c:105:\t\trc = cio_clear(sch);\ndrivers/s390/cio/ccwreq.c-106-\t\tif (rc)\n--\ndrivers/s390/cio/ccwreq.c=150=int ccw_request_cancel(struct ccw_device *cdev)\n--\ndrivers/s390/cio/ccwreq.c-158-\treq-\u003ecancel = 1;\ndrivers/s390/cio/ccwreq.c:159:\trc = cio_clear(sch);\ndrivers/s390/cio/ccwreq.c-160-\tif (rc)\n--\ndrivers/s390/cio/ccwreq.c=254=void ccw_request_handler(struct ccw_device *cdev)\ndrivers/s390/cio/ccwreq.c-255-{\ndrivers/s390/cio/ccwreq.c:256:\tstruct irb *irb = this_cpu_ptr(\u0026cio_irb);\ndrivers/s390/cio/ccwreq.c-257-\tstruct ccw_request *req = \u0026cdev-\u003eprivate-\u003ereq;\n--\ndrivers/s390/cio/ccwreq.c=326=void ccw_request_timeout(struct ccw_device *cdev)\n--\ndrivers/s390/cio/ccwreq.c-331-\ndrivers/s390/cio/ccwreq.c:332:\tif (cio_update_schib(sch))\ndrivers/s390/cio/ccwreq.c-333-\t\tgoto err;\n--\ndrivers/s390/cio/ccwreq.c-348-\t}\ndrivers/s390/cio/ccwreq.c:349:\trc = cio_clear(sch);\ndrivers/s390/cio/ccwreq.c-350-\tif (rc)\n--\ndrivers/s390/cio/chp.c-23-\ndrivers/s390/cio/chp.c:24:#include \"cio.h\"\ndrivers/s390/cio/chp.c-25-#include \"css.h\"\ndrivers/s390/cio/chp.c-26-#include \"ioasm.h\"\ndrivers/s390/cio/chp.c:27:#include \"cio_debug.h\"\ndrivers/s390/cio/chp.c-28-#include \"chp.h\"\n--\ndrivers/s390/cio/chsc.c-10-\ndrivers/s390/cio/chsc.c:11:#define pr_fmt(fmt) \"cio: \" fmt\ndrivers/s390/cio/chsc.c-12-\n--\ndrivers/s390/cio/chsc.c-20-\ndrivers/s390/cio/chsc.c:21:#include \u003casm/cio.h\u003e\ndrivers/s390/cio/chsc.c-22-#include \u003casm/chpid.h\u003e\n--\ndrivers/s390/cio/chsc.c-28-#include \"css.h\"\ndrivers/s390/cio/chsc.c:29:#include \"cio.h\"\ndrivers/s390/cio/chsc.c:30:#include \"cio_debug.h\"\ndrivers/s390/cio/chsc.c-31-#include \"ioasm.h\"\n--\ndrivers/s390/cio/chsc_sch.c-19-\ndrivers/s390/cio/chsc_sch.c:20:#include \u003casm/cio.h\u003e\ndrivers/s390/cio/chsc_sch.c-21-#include \u003casm/chsc.h\u003e\n--\ndrivers/s390/cio/chsc_sch.c-23-\ndrivers/s390/cio/chsc_sch.c:24:#include \"cio.h\"\ndrivers/s390/cio/chsc_sch.c:25:#include \"cio_debug.h\"\ndrivers/s390/cio/chsc_sch.c-26-#include \"css.h\"\n--\ndrivers/s390/cio/chsc_sch.c=54=static void chsc_subchannel_irq(struct subchannel *sch)\n--\ndrivers/s390/cio/chsc_sch.c-57-\tstruct chsc_request *request = private-\u003erequest;\ndrivers/s390/cio/chsc_sch.c:58:\tstruct irb *irb = this_cpu_ptr(\u0026cio_irb);\ndrivers/s390/cio/chsc_sch.c-59-\n--\ndrivers/s390/cio/chsc_sch.c-71-\tmemcpy(\u0026request-\u003eirb, irb, sizeof(*irb));\ndrivers/s390/cio/chsc_sch.c:72:\tcio_update_schib(sch);\ndrivers/s390/cio/chsc_sch.c-73-\tcomplete(\u0026request-\u003ecompletion);\n--\ndrivers/s390/cio/chsc_sch.c=77=static int chsc_subchannel_probe(struct subchannel *sch)\n--\ndrivers/s390/cio/chsc_sch.c-88-\tdev_set_drvdata(\u0026sch-\u003edev, private);\ndrivers/s390/cio/chsc_sch.c:89:\tret = cio_enable_subchannel(sch, (u32)virt_to_phys(sch));\ndrivers/s390/cio/chsc_sch.c-90-\tif (ret) {\n--\ndrivers/s390/cio/chsc_sch.c=99=static void chsc_subchannel_remove(struct subchannel *sch)\n--\ndrivers/s390/cio/chsc_sch.c-102-\ndrivers/s390/cio/chsc_sch.c:103:\tcio_disable_subchannel(sch);\ndrivers/s390/cio/chsc_sch.c-104-\tprivate = dev_get_drvdata(\u0026sch-\u003edev);\n--\ndrivers/s390/cio/chsc_sch.c=113=static void chsc_subchannel_shutdown(struct subchannel *sch)\ndrivers/s390/cio/chsc_sch.c-114-{\ndrivers/s390/cio/chsc_sch.c:115:\tcio_disable_subchannel(sch);\ndrivers/s390/cio/chsc_sch.c-116-}\n--\ndrivers/s390/cio/cio.c-11-\ndrivers/s390/cio/cio.c:12:#define pr_fmt(fmt) \"cio: \" fmt\ndrivers/s390/cio/cio.c-13-\n--\ndrivers/s390/cio/cio.c-22-#include \u003clinux/irq.h\u003e\ndrivers/s390/cio/cio.c:23:#include \u003casm/cio.h\u003e\ndrivers/s390/cio/cio.c-24-#include \u003casm/delay.h\u003e\n--\ndrivers/s390/cio/cio.c-35-#include \u003casm/crw.h\u003e\ndrivers/s390/cio/cio.c:36:#include \"cio.h\"\ndrivers/s390/cio/cio.c-37-#include \"css.h\"\n--\ndrivers/s390/cio/cio.c-41-#include \"blacklist.h\"\ndrivers/s390/cio/cio.c:42:#include \"cio_debug.h\"\ndrivers/s390/cio/cio.c-43-#include \"chp.h\"\n--\ndrivers/s390/cio/cio.c-45-\ndrivers/s390/cio/cio.c:46:debug_info_t *cio_debug_msg_id;\ndrivers/s390/cio/cio.c:47:debug_info_t *cio_debug_trace_id;\ndrivers/s390/cio/cio.c:48:debug_info_t *cio_debug_crw_id;\ndrivers/s390/cio/cio.c-49-\ndrivers/s390/cio/cio.c:50:DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb);\ndrivers/s390/cio/cio.c:51:EXPORT_PER_CPU_SYMBOL(cio_irb);\ndrivers/s390/cio/cio.c-52-\ndrivers/s390/cio/cio.c-53-/*\ndrivers/s390/cio/cio.c:54: * Function: cio_debug_init\ndrivers/s390/cio/cio.c-55- * Initializes three debug logs for common I/O:\ndrivers/s390/cio/cio.c:56: * - cio_msg logs generic cio messages\ndrivers/s390/cio/cio.c:57: * - cio_trace logs the calling of different functions\ndrivers/s390/cio/cio.c:58: * - cio_crw logs machine check related cio messages\ndrivers/s390/cio/cio.c-59- */\ndrivers/s390/cio/cio.c:60:static int __init cio_debug_init(void)\ndrivers/s390/cio/cio.c-61-{\ndrivers/s390/cio/cio.c:62:\tcio_debug_msg_id = debug_register(\"cio_msg\", 16, 1, 11 * sizeof(long));\ndrivers/s390/cio/cio.c:63:\tif (!cio_debug_msg_id)\ndrivers/s390/cio/cio.c-64-\t\tgoto out_unregister;\ndrivers/s390/cio/cio.c:65:\tdebug_register_view(cio_debug_msg_id, \u0026debug_sprintf_view);\ndrivers/s390/cio/cio.c:66:\tdebug_set_level(cio_debug_msg_id, 2);\ndrivers/s390/cio/cio.c:67:\tcio_debug_trace_id = debug_register(\"cio_trace\", 16, 1, 16);\ndrivers/s390/cio/cio.c:68:\tif (!cio_debug_trace_id)\ndrivers/s390/cio/cio.c-69-\t\tgoto out_unregister;\ndrivers/s390/cio/cio.c:70:\tdebug_register_view(cio_debug_trace_id, \u0026debug_hex_ascii_view);\ndrivers/s390/cio/cio.c:71:\tdebug_set_level(cio_debug_trace_id, 2);\ndrivers/s390/cio/cio.c:72:\tcio_debug_crw_id = debug_register(\"cio_crw\", 8, 1, 8 * sizeof(long));\ndrivers/s390/cio/cio.c:73:\tif (!cio_debug_crw_id)\ndrivers/s390/cio/cio.c-74-\t\tgoto out_unregister;\ndrivers/s390/cio/cio.c:75:\tdebug_register_view(cio_debug_crw_id, \u0026debug_sprintf_view);\ndrivers/s390/cio/cio.c:76:\tdebug_set_level(cio_debug_crw_id, 4);\ndrivers/s390/cio/cio.c-77-\treturn 0;\n--\ndrivers/s390/cio/cio.c-79-out_unregister:\ndrivers/s390/cio/cio.c:80:\tdebug_unregister(cio_debug_msg_id);\ndrivers/s390/cio/cio.c:81:\tdebug_unregister(cio_debug_trace_id);\ndrivers/s390/cio/cio.c:82:\tdebug_unregister(cio_debug_crw_id);\ndrivers/s390/cio/cio.c-83-\treturn -1;\n--\ndrivers/s390/cio/cio.c-85-\ndrivers/s390/cio/cio.c:86:arch_initcall (cio_debug_init);\ndrivers/s390/cio/cio.c-87-\ndrivers/s390/cio/cio.c:88:int cio_set_options(struct subchannel *sch, int flags)\ndrivers/s390/cio/cio.c-89-{\n--\ndrivers/s390/cio/cio.c=98=static int\ndrivers/s390/cio/cio.c:99:cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)\ndrivers/s390/cio/cio.c-100-{\n--\ndrivers/s390/cio/cio.c-107-\ndrivers/s390/cio/cio.c:108:\tCIO_MSG_EVENT(2, \"cio_start: 'not oper' status for \"\ndrivers/s390/cio/cio.c-109-\t\t      \"subchannel 0.%x.%04x!\\n\", sch-\u003eschid.ssid,\n--\ndrivers/s390/cio/cio.c-111-\ndrivers/s390/cio/cio.c:112:\tif (cio_update_schib(sch))\ndrivers/s390/cio/cio.c-113-\t\treturn -ENODEV;\n--\ndrivers/s390/cio/cio.c=122=int\ndrivers/s390/cio/cio.c:123:cio_start_key (struct subchannel *sch,\t/* subchannel structure */\ndrivers/s390/cio/cio.c-124-\t       struct ccw1 * cpa,\t/* logical channel prog addr */\n--\ndrivers/s390/cio/cio.c-167-\tcase 3:\t\t/* device/path not operational */\ndrivers/s390/cio/cio.c:168:\t\treturn cio_start_handle_notoper(sch, lpm);\ndrivers/s390/cio/cio.c-169-\tdefault:\n--\ndrivers/s390/cio/cio.c-172-}\ndrivers/s390/cio/cio.c:173:EXPORT_SYMBOL_GPL(cio_start_key);\ndrivers/s390/cio/cio.c-174-\ndrivers/s390/cio/cio.c=175=int\ndrivers/s390/cio/cio.c:176:cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)\ndrivers/s390/cio/cio.c-177-{\ndrivers/s390/cio/cio.c:178:\treturn cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);\ndrivers/s390/cio/cio.c-179-}\ndrivers/s390/cio/cio.c:180:EXPORT_SYMBOL_GPL(cio_start);\ndrivers/s390/cio/cio.c-181-\n--\ndrivers/s390/cio/cio.c=185=int\ndrivers/s390/cio/cio.c:186:cio_resume (struct subchannel *sch)\ndrivers/s390/cio/cio.c-187-{\n--\ndrivers/s390/cio/cio.c-212-}\ndrivers/s390/cio/cio.c:213:EXPORT_SYMBOL_GPL(cio_resume);\ndrivers/s390/cio/cio.c-214-\n--\ndrivers/s390/cio/cio.c=218=int\ndrivers/s390/cio/cio.c:219:cio_halt(struct subchannel *sch)\ndrivers/s390/cio/cio.c-220-{\n--\ndrivers/s390/cio/cio.c-246-}\ndrivers/s390/cio/cio.c:247:EXPORT_SYMBOL_GPL(cio_halt);\ndrivers/s390/cio/cio.c-248-\n--\ndrivers/s390/cio/cio.c=252=int\ndrivers/s390/cio/cio.c:253:cio_clear(struct subchannel *sch)\ndrivers/s390/cio/cio.c-254-{\n--\ndrivers/s390/cio/cio.c-277-}\ndrivers/s390/cio/cio.c:278:EXPORT_SYMBOL_GPL(cio_clear);\ndrivers/s390/cio/cio.c-279-\ndrivers/s390/cio/cio.c-280-/*\ndrivers/s390/cio/cio.c:281: * Function: cio_cancel\ndrivers/s390/cio/cio.c-282- * Issues a \"Cancel Subchannel\" on the specified subchannel\n--\ndrivers/s390/cio/cio.c=287=int\ndrivers/s390/cio/cio.c:288:cio_cancel (struct subchannel *sch)\ndrivers/s390/cio/cio.c-289-{\n--\ndrivers/s390/cio/cio.c-304-\t\t/* Update information in scsw. */\ndrivers/s390/cio/cio.c:305:\t\tif (cio_update_schib(sch))\ndrivers/s390/cio/cio.c-306-\t\t\treturn -ENODEV;\n--\ndrivers/s390/cio/cio.c-315-}\ndrivers/s390/cio/cio.c:316:EXPORT_SYMBOL_GPL(cio_cancel);\ndrivers/s390/cio/cio.c-317-\ndrivers/s390/cio/cio.c-318-/**\ndrivers/s390/cio/cio.c:319: * cio_cancel_halt_clear - Cancel running I/O by performing cancel, halt\ndrivers/s390/cio/cio.c-320- * and clear ordinally if subchannel is valid.\n--\ndrivers/s390/cio/cio.c-324- * This should be called repeatedly since halt/clear are asynchronous\ndrivers/s390/cio/cio.c:325: * operations. We do one try with cio_cancel, three tries with cio_halt,\ndrivers/s390/cio/cio.c:326: * 255 tries with cio_clear. The caller should initialize @iretry with\ndrivers/s390/cio/cio.c-327- * the value 255 for its first call to this, and keep using the same\n--\ndrivers/s390/cio/cio.c-333- */\ndrivers/s390/cio/cio.c:334:int cio_cancel_halt_clear(struct subchannel *sch, int *iretry)\ndrivers/s390/cio/cio.c-335-{\n--\ndrivers/s390/cio/cio.c-337-\ndrivers/s390/cio/cio.c:338:\tif (cio_update_schib(sch))\ndrivers/s390/cio/cio.c-339-\t\treturn -ENODEV;\n--\ndrivers/s390/cio/cio.c-346-\t\tif (!scsw_is_tm(\u0026sch-\u003eschib.scsw)) {\ndrivers/s390/cio/cio.c:347:\t\t\tret = cio_cancel(sch);\ndrivers/s390/cio/cio.c-348-\t\t\tif (ret != -EINVAL)\n--\ndrivers/s390/cio/cio.c-360-\t\t\t*iretry -= 1;\ndrivers/s390/cio/cio.c:361:\t\t\tret = cio_halt(sch);\ndrivers/s390/cio/cio.c-362-\t\t\tif (ret != -EBUSY)\n--\ndrivers/s390/cio/cio.c-370-\t\t*iretry -= 1;\ndrivers/s390/cio/cio.c:371:\t\tret = cio_clear(sch);\ndrivers/s390/cio/cio.c-372-\t\treturn (ret == 0) ? -EBUSY : ret;\n--\ndrivers/s390/cio/cio.c-376-}\ndrivers/s390/cio/cio.c:377:EXPORT_SYMBOL_GPL(cio_cancel_halt_clear);\ndrivers/s390/cio/cio.c-378-\ndrivers/s390/cio/cio.c:379:static void cio_apply_config(struct subchannel *sch, struct schib *schib)\ndrivers/s390/cio/cio.c-380-{\n--\ndrivers/s390/cio/cio.c-392-\ndrivers/s390/cio/cio.c:393:static int cio_check_config(struct subchannel *sch, struct schib *schib)\ndrivers/s390/cio/cio.c-394-{\n--\ndrivers/s390/cio/cio.c-406-/*\ndrivers/s390/cio/cio.c:407: * cio_commit_config - apply configuration to the subchannel\ndrivers/s390/cio/cio.c-408- */\ndrivers/s390/cio/cio.c:409:int cio_commit_config(struct subchannel *sch)\ndrivers/s390/cio/cio.c-410-{\n--\ndrivers/s390/cio/cio.c-419-\t\t/* copy desired changes to local schib */\ndrivers/s390/cio/cio.c:420:\t\tcio_apply_config(sch, \u0026schib);\ndrivers/s390/cio/cio.c-421-\t\tccode = msch(sch-\u003eschid, \u0026schib);\n--\ndrivers/s390/cio/cio.c-428-\t\t\t\treturn -ENODEV;\ndrivers/s390/cio/cio.c:429:\t\t\tif (cio_check_config(sch, \u0026schib)) {\ndrivers/s390/cio/cio.c-430-\t\t\t\t/* commit changes from local schib */\n--\ndrivers/s390/cio/cio.c-450-}\ndrivers/s390/cio/cio.c:451:EXPORT_SYMBOL_GPL(cio_commit_config);\ndrivers/s390/cio/cio.c-452-\ndrivers/s390/cio/cio.c-453-/**\ndrivers/s390/cio/cio.c:454: * cio_update_schib - Perform stsch and update schib if subchannel is valid.\ndrivers/s390/cio/cio.c-455- * @sch: subchannel on which to perform stsch\n--\ndrivers/s390/cio/cio.c-457- */\ndrivers/s390/cio/cio.c:458:int cio_update_schib(struct subchannel *sch)\ndrivers/s390/cio/cio.c-459-{\n--\ndrivers/s390/cio/cio.c-471-}\ndrivers/s390/cio/cio.c:472:EXPORT_SYMBOL_GPL(cio_update_schib);\ndrivers/s390/cio/cio.c-473-\ndrivers/s390/cio/cio.c-474-/**\ndrivers/s390/cio/cio.c:475: * cio_enable_subchannel - enable a subchannel.\ndrivers/s390/cio/cio.c-476- * @sch: subchannel to be enabled\n--\ndrivers/s390/cio/cio.c-478- */\ndrivers/s390/cio/cio.c:479:int cio_enable_subchannel(struct subchannel *sch, u32 intparm)\ndrivers/s390/cio/cio.c-480-{\n--\ndrivers/s390/cio/cio.c-487-\t\treturn -EINVAL;\ndrivers/s390/cio/cio.c:488:\tif (cio_update_schib(sch))\ndrivers/s390/cio/cio.c-489-\t\treturn -ENODEV;\n--\ndrivers/s390/cio/cio.c-494-\ndrivers/s390/cio/cio.c:495:\tret = cio_commit_config(sch);\ndrivers/s390/cio/cio.c-496-\tif (ret == -EIO) {\n--\ndrivers/s390/cio/cio.c-501-\t\tsch-\u003econfig.csense = 0;\ndrivers/s390/cio/cio.c:502:\t\tret = cio_commit_config(sch);\n\n"
}

gemini-3.7-flash

null

null

							input: 30556
							output: 110
							thoughts: 686
						

**Analysis of Potential Fuzzing Worthiness**

Okay, let's break this down systematically. My immediate thought is to check the Kconfig files to understand the build context for `drivers/s390`. A quick peek at `drivers/Makefile` confirms the expected dependency: `obj-$(CONFIG_S390) += s390/`. And `arch/s390/Kconfig` defines `CONFIG_S390`. On my target architecture, amd64 (x86_64), `CONFIG_S390` is unequivocally false, preventing the build of `drivers/s390/`. Moreover, the header file `arch/s390/include/asm/idals.h` makes it clear this is s390-specific code.

Now, let's apply the fuzzing criteria. REACHABILITY IS PARAMOUNT; modified code must be reachable. The negative criterion tells me that code paths exclusive to architectures other than the target must *not* be fuzzed. My target is amd64.

Looking at the list of all modified files:
- `arch/s390/include/asm/idals.h`
- `drivers/s390/cio/chsc.c`
- `drivers/s390/cio/chsc_sch.c`
- `drivers/s390/cio/cmf.c`
- `drivers/s390/cio/qdio.h`
- `drivers/s390/cio/qdio_main.c`
- `drivers/s390/cio/qdio_setup.c`
- `drivers/s390/cio/qdio_thinint.c`
- `drivers/s390/cio/scm.c`

Every single file resides in either `arch/s390` or `drivers/s390`. This screams "s390 architecture only." These files are *not* compiled or reachable on amd64.

Therefore, this patch does *not* warrant fuzzing. The outcome is: `WorthFuzzing = false`, `EnableConfigs = []`, and `FocusSymbols = []`. My reasoning is solid: the patch exclusively modifies code specific to the s390 architecture, and is therefore unreachable on amd64.

As a final sanity check, a quick sweep of the diff confirms that *only* s390-specific files are modified, and no generic headers or arch-agnostic files were touched. The initial analysis holds. The `set-results` function can now be called.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch modifies s390-specific memory allocation helpers and the s390 Channel I/O (CIO) subsystem (arch/s390/include/asm/idals.h and drivers/s390/cio/*). These files are exclusive to the s390 architecture and are not compiled or reachable on the target architecture (amd64).",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies s390-specific memory allocation helpers and the s390 Channel I/O (CIO) subsystem (arch/s390/include/asm/idals.h and drivers/s390/cio/*). These files are exclusive to the s390 architecture and are not compiled or reachable on the target architecture (amd64).",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

null