[PATCH] selftests/mm: Fix unused function warning for aarch64_write_signal_pkey()

[Kevin Brodsky]

On 08/11/2024 12:05, Catalin Marinas wrote:
> Since commit 49f59573e9e0 ("selftests/mm: Enable pkey_sighandler_tests
> on arm64"), pkey_sighandler_tests.c (which includes pkey-arm64.h via
> pkey-helpers.h) ends up compiled for arm64. Since it doesn't use
> aarch64_write_signal_pkey(), the compiler warns:
>
> In file included from pkey-helpers.h:106,
>                  from pkey_sighandler_tests.c:31:
> pkey-arm64.h:130:13: warning: ‘aarch64_write_signal_pkey’ defined but not used [-Wunused-function]
>   130 | static void aarch64_write_signal_pkey(ucontext_t *uctxt, u64 pkey)
>       |             ^~~~~~~~~~~~~~~~~~~~~~~~~
>
> Make the aarch64_write_signal_pkey() a 'static inline void' function to
> avoid the compiler warning.
>
> Fixes: f5b5ea51f78f ("selftests: mm: make protection_keys test work on arm64")
> Cc: Shuah Khan <skhan at linuxfoundation.org>
> Cc: Joey Gouly <joey.gouly at arm.com>
> Cc: Kevin Brodsky <kevin.brodsky at arm.com>
> Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>

I've got this diff locally, didn't realise it was my patches that
revealed the issue otherwise I'd have posted it earlier. Either way:

Reviewed-by: Kevin Brodsky <kevin.brodsky at arm.com>

- Kevin

> ---
>
> I'll add this on top of the arm64 for-next/pkey-signal branch together with
> Kevin's other patches.
>
>  tools/testing/selftests/mm/pkey-arm64.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/mm/pkey-arm64.h b/tools/testing/selftests/mm/pkey-arm64.h
> index d57fbeace38f..d9d2100eafc0 100644
> --- a/tools/testing/selftests/mm/pkey-arm64.h
> +++ b/tools/testing/selftests/mm/pkey-arm64.h
> @@ -127,7 +127,7 @@ static inline u64 get_pkey_bits(u64 reg, int pkey)
>  	return 0;
>  }
>  
> -static void aarch64_write_signal_pkey(ucontext_t *uctxt, u64 pkey)
> +static inline void aarch64_write_signal_pkey(ucontext_t *uctxt, u64 pkey)
>  {
>  	struct _aarch64_ctx *ctx = GET_UC_RESV_HEAD(uctxt);
>  	struct poe_context *poe_ctx =