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

[Mark Brown]

On Wed, Apr 22, 2026 at 06:01:39PM +0100, Leo Yan wrote:
> Building on Debian sid with GCC 15 fails:

> GCC-15 defines NT_ARM_GCS in the toolchain headers, causing gcs-util.h
> to skip its fallback definition of struct user_gcs. This leads to the
> compiler error.

Are you sure it's GCC and not libc?  Anyway...

>  tools/testing/selftests/arm64/gcs/libc-gcs.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/testing/selftests/arm64/gcs/libc-gcs.c b/tools/testing/selftests/arm64/gcs/libc-gcs.c
> index 17b2fabfec386e523e788d8bcfcafa553c93bd9b..72e82bfbecc99e34da71d56cf5401c137d6e9a48 100644
> --- a/tools/testing/selftests/arm64/gcs/libc-gcs.c
> +++ b/tools/testing/selftests/arm64/gcs/libc-gcs.c
> @@ -16,6 +16,7 @@
>  
>  #include <asm/hwcap.h>
>  #include <asm/mman.h>
> +#include <asm/ptrace.h>

Shouldn't this be in gcs-util.h where the local definition is?
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