The bindgen utility cannot handle "#define compat_ptr_ioctl NULL" in the
C header, so we need to handle this case on our own.

Simply skip this field in the initializer when !CONFIG_COMPAT as the
SAFETY comment above this initializer implies this is allowed.

Reported-by: Miguel Ojeda <ojeda@kernel.org>
Closes: https://lore.kernel.org/all/CANiq72mrVzqXnAV=Hy2XBOonLHA6YQgH-ckZoc_h0VBvTGK8rA@mail.gmail.com/
Fixes: eafedbc7c050 ("rust_binder: add Rust Binder driver")
Cc: stable@vger.kernel.org
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
---

Changes from v1: fix Miguel's mail address and add tags for stable
backport.

 drivers/android/binder/rust_binder_main.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/android/binder/rust_binder_main.rs b/drivers/android/binder/rust_binder_main.rs
index 47bfb114cabb..e70f250bb4cd 100644
--- a/drivers/android/binder/rust_binder_main.rs
+++ b/drivers/android/binder/rust_binder_main.rs
@@ -312,6 +312,7 @@ 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),
         mmap: Some(rust_binder_mmap),
         open: Some(rust_binder_open),
-- 
2.53.0

On Sat, Feb 14, 2026 at 2:34 PM Xi Ruoyao <xry111@xry111.site> wrote:
>
> Reported-by: Miguel Ojeda <ojeda@kernel.org>
> Closes: https://lore.kernel.org/all/CANiq72mrVzqXnAV=Hy2XBOonLHA6YQgH-ckZoc_h0VBvTGK8rA@mail.gmail.com/

Hmm... Wasn't this applied as:

  174e2a339bf7 ("rust_binder: Fix build failure if !CONFIG_COMPAT")

Then there was also this other thread:

  https://lore.kernel.org/rust-for-linux/20260105-redefine-compat_ptr_ioctl-v1-1-25edb3d91acc@google.com/

which got applied as:

  68aabb29a546 ("rust: redefine `bindings::compat_ptr_ioctl` in Rust")

Cheers,
Miguel

On Sat, 2026-02-14 at 23:18 +0100, Miguel Ojeda wrote:
> On Sat, Feb 14, 2026 at 2:34 PM Xi Ruoyao <xry111@xry111.site> wrote:
> > 
> > Reported-by: Miguel Ojeda <ojeda@kernel.org>
> > Closes:
> > https://lore.kernel.org/all/CANiq72mrVzqXnAV=Hy2XBOonLHA6YQgH-ckZoc_h0VBvTGK8rA@mail.gmail.com/
> 
> Hmm... Wasn't this applied as:
> 
>   174e2a339bf7 ("rust_binder: Fix build failure if !CONFIG_COMPAT")
> 
> Then there was also this other thread:
> 
>  
> https://lore.kernel.org/rust-for-linux/20260105-redefine-compat_ptr_ioctl-v1-1-25edb3d91acc@google.com/
> 
> which got applied as:
> 
>   68aabb29a546 ("rust: redefine `bindings::compat_ptr_ioctl` in Rust")

Oops, just saw the mail regarding your email address yesterday when I
was archiving mails in 2025 and I thought the patch was blocked by the
issue.

Disregard this then.


-- 
Xi Ruoyao <xry111@xry111.site>