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

[Wei Yang]

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>

Looks reasonable.

Reviewed-by: Wei Yang <richard.weiyang at gmail.com>

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Wei Yang
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