[PATCH] selftests: centralise maybe-unused definition in kselftest.h

[Ming Lei]

On Thu, Aug 21, 2025 at 03:41:59PM +0530, Bala-Vignesh-Reddy wrote:
> Several selftests subdirectories duplicated the define __maybe_unused,
> leading to redundant code. Moved to kselftest.h header and removed
> other definition.
> 
> This addresses the duplication noted in the proc-pid-vm warning fix
> 
> Suggested-by: Andrew Morton <akpm at linux-foundation.org>
> Link:https://lore.kernel.org/lkml/20250820143954.33d95635e504e94df01930d0@linux-foundation.org/
> 
> Signed-off-by: Bala-Vignesh-Reddy <reddybalavignesh9979 at gmail.com>

Reviewed-by: Ming Lei <ming.lei at redhat.com>

Thanks,
Ming