[PATCH v2] kselftest/arm64: Fix build failure with GCC-15

[Mark Brown]

On Wed, Apr 22, 2026 at 06:42:54PM +0100, Leo Yan wrote:

> For GCC-15, NT_ARM_GCS is defined in the libc header, causing gcs-util.h
> to skip its fallback definition of struct user_gcs. This leads to the
> compiler error.

> Fix this by including <asm/ptrace.h> to provide the proper definition.

> +++ b/tools/testing/selftests/arm64/gcs/gcs-util.h
> @@ -7,6 +7,7 @@
>  #define GCS_UTIL_H
>  
>  #include <stdbool.h>
> +#include <asm/ptrace.h>
>  
>  #ifndef __NR_map_shadow_stack
>  #define __NR_map_shadow_stack 453

Reviewed-by: Mark Brown <broonie at kernel.org>
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