Subject: Re: [PATCH] ARM: Do not select HAVE_RUST when KASAN is enabled

From: Alice Ryhl <[email-masked]>
Date: Mon, 11 May 2026 08:21:48 +0000

On Mon, May 11, 2026 at 05:02:44PM +0900, Nathan Chancellor wrote:
> When KASAN is enabled, such as with allmodconfig, the build fails when
> building the Rust code with:
> 
>   error: kernel-address sanitizer is not supported for this target
> 
>   error: aborting due to 1 previous error
> 
>   make[4]: *** [rust/Makefile:654: rust/core.o] Error 1
> 
> The arm-unknown-linux-gnueabi target does not support KASAN, so avoid
> saying Rust is supported when it is enabled.
> 
> Cc: [email-masked]
> Fixes: ccb8ce526807 ("ARM: 9441/1: rust: Enable Rust support for ARMv7")
> Link: https://github.com/Rust-for-Linux/linux/issues/1234
> Signed-off-by: Nathan Chancellor <[email-masked]>

I would probably suggest moving the conditions out to a separate
RUSTC_SUPPORTS_ARM config option similar to what I did in commit
d077242d68a3 ("rust: support for shadow call stack sanitizer").

This way it will be simpler to adjust this logic when the target obtains
support for this sanitizer.

Also, we may need the same change for CONFIG_CFI too.

Alice