linux-kernel - Re: [PATCH] selftests/mm: use __auto

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Message-ID: <CAH4c4jJ8VywRUfn2z8HnA73vNxviZ53DZttcR3JaPULF3JFkQA@mail.gmail.com>
Date: Wed, 6 Aug 2025 21:15:50 +0530
From: Pranav Tyagi <pranav.tyagi03@...il.com>
To: akpm@...ux-foundation.org, peterx@...hat.com, shuah@...nel.org, 
	linux-mm@...ck.org, linux-kselftest@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Cc: linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH] selftests/mm: use __auto_type in swap() macro

On Wed, Jul 30, 2025 at 7:53 PM Pranav Tyagi <pranav.tyagi03@...il.com> wrote:
>
> Replace typeof() with __auto_type in the swap() macro in uffd-stress.c.
> __auto_type was introduced in GCC 4.9 and reduces the compile time for
> all compilers. No functional changes intended.
>
> Signed-off-by: Pranav Tyagi <pranav.tyagi03@...il.com>
> ---
>  tools/testing/selftests/mm/uffd-stress.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c
> index 40af7f67c407..c0f64df5085c 100644
> --- a/tools/testing/selftests/mm/uffd-stress.c
> +++ b/tools/testing/selftests/mm/uffd-stress.c
> @@ -51,7 +51,7 @@ static char *zeropage;
>  pthread_attr_t attr;
>
>  #define swap(a, b) \
> -       do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
> +       do { __auto_type __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
>
>  const char *examples =
>         "# Run anonymous memory test on 100MiB region with 99999 bounces:\n"
> --
> 2.49.0
>

Hi,

Just a gentle follow-up on this cleanup patch. From what I could find,
this is the only use of
typeof() left in the mm selftests, so this should be the only instance
needing this change.

Thanks for considering!

Regards
Pranav Tyagi