There is currently an inconsistency between C and Rust, which is that
when Rust requires cfg(CONFIG_COMPAT) on compat_ioctl when using the
compat_ptr_ioctl symbol because '#define compat_ptr_ioctl NULL' does not
get translated to anything by bindgen.

But it's not *just* a matter of translating the '#define' into Rust when
CONFIG_COMPAT=n. This is because when CONFIG_COMPAT=y, the type of
compat_ptr_ioctl is a non-nullable function pointer, and to seamlessly
use it regardless of the config, we need a nullable function pointer.

I think it's important to do something about this; I've seen the mistake
of accidentally forgetting '#[cfg(CONFIG_COMPAT)]' when compat_ptr_ioctl
is used multiple times now.

This explicitly declares 'bindings::compat_ptr_ioctl' as an Option that
is always defined but might be None. This matches C, but isn't ideal:
it modifies the bindings crate. But I'm not sure if there's a better way
to do it. If we just redefine in kernel/, then people may still use the
one in bindings::, since that is where you would normally find it. I am
open to suggestions.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
 drivers/android/binder/rust_binder_main.rs |  3 +--
 rust/bindings/lib.rs                       | 13 +++++++++++++
 rust/kernel/miscdevice.rs                  |  2 +-
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/android/binder/rust_binder_main.rs b/drivers/android/binder/rust_binder_main.rs
index d84c3c360be0ee79e4dab22d613bc927a70895a7..30e4517f90a3c5c2cf83c91530a6dfcca7316bd6 100644
--- a/drivers/android/binder/rust_binder_main.rs
+++ b/drivers/android/binder/rust_binder_main.rs
@@ -322,8 +322,7 @@ unsafe impl<T> Sync for AssertSync<T> {}
         owner: THIS_MODULE.as_ptr(),
         poll: Some(rust_binder_poll),
         unlocked_ioctl: Some(rust_binder_ioctl),
-        #[cfg(CONFIG_COMPAT)]
-        compat_ioctl: Some(bindings::compat_ptr_ioctl),
+        compat_ioctl: bindings::compat_ptr_ioctl,
         mmap: Some(rust_binder_mmap),
         open: Some(rust_binder_open),
         release: Some(rust_binder_release),
diff --git a/rust/bindings/lib.rs b/rust/bindings/lib.rs
index 0c57cf9b4004f176997c59ecc58a9a9ac76163d9..19f57c5b2fa2a343c4250063e9d5ce1067e6b6ff 100644
--- a/rust/bindings/lib.rs
+++ b/rust/bindings/lib.rs
@@ -67,3 +67,16 @@ mod bindings_helper {
 }
 
 pub use bindings_raw::*;
+
+pub const compat_ptr_ioctl: Option<
+    unsafe extern "C" fn(*mut file, ffi::c_uint, ffi::c_ulong) -> ffi::c_long,
+> = {
+    #[cfg(CONFIG_COMPAT)]
+    {
+        Some(bindings_raw::compat_ptr_ioctl)
+    }
+    #[cfg(not(CONFIG_COMPAT))]
+    {
+        None
+    }
+};
diff --git a/rust/kernel/miscdevice.rs b/rust/kernel/miscdevice.rs
index ba64c8a858f0d74ae54789d1f16a39479fd54b96..c3c2052c92069f6e64b7bb68d6d888c6aca01373 100644
--- a/rust/kernel/miscdevice.rs
+++ b/rust/kernel/miscdevice.rs
@@ -410,7 +410,7 @@ impl<T: MiscDevice> MiscdeviceVTable<T> {
         compat_ioctl: if T::HAS_COMPAT_IOCTL {
             Some(Self::compat_ioctl)
         } else if T::HAS_IOCTL {
-            Some(bindings::compat_ptr_ioctl)
+            bindings::compat_ptr_ioctl
         } else {
             None
         },

---
base-commit: 8314d2c28d3369bc879af8e848f810292b16d0af
change-id: 20260105-redefine-compat_ptr_ioctl-e64f9462225c

Best regards,
-- 
Alice Ryhl <aliceryhl@google.com>