[Devel] [PATCH vz10 2/2] x86/ibt: fix -Wignored-attributes in BPF programs

[Konstantin Khorenko]

On 5/7/26 17:58, Eva Kurchatova wrote:
> BPF programs include arch-specific headers, like x86/ibt
dot

> 
> Clang warns when compiling BPF kernel programs because kernel headers
> use the nocf_check attribute (__noendbr macro) which requires
> -fcf-protection, but this flag is meaningless for the BPF target

dot

> 
> Fix this by only using nocf_check attribute when CET is enabled

dot

> 
> https://virtuozzo.atlassian.net/browse/VSTOR-127585
> feature: fix kselftests
> 
> Signed-off-by: Eva Kurchatova <eva.kurchatova at virtuozzo.com>
> ---
>   arch/x86/include/asm/ibt.h | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/include/asm/ibt.h b/arch/x86/include/asm/ibt.h
> index 6c53ece42dea..0f12b375c7e9 100644
> --- a/arch/x86/include/asm/ibt.h
> +++ b/arch/x86/include/asm/ibt.h
> @@ -29,7 +29,11 @@
>   #define ASM_ENDBR	"endbr32\n\t"
>   #endif
>   
> +#ifdef __CET__
>   #define __noendbr	__attribute__((nocf_check))
> +#else
> +#define __noendbr      __attribute__(())
> +#endif
>   
>   /*
>    * Create a dummy function pointer reference to prevent objtool from marking

Please also let's go with the "mainstream first" approach here.