linux-kernel - Re: [PATCH] selftests: vDSO: parse: warning: fix assignment as a condition

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Date:   Fri, 5 Nov 2021 13:17:14 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     shuah@...nel.org, nathan@...nel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] selftests: vDSO: parse: warning: fix assignment as a condition

On Fri, Nov 5, 2021 at 9:28 AM Anders Roxell <anders.roxell@...aro.org> wrote:
>
> When building selftests/vDSO with clang the following warning shows up:
>
> clang -std=gnu99 -Wno-pointer-sign    vdso_test_gettimeofday.c parse_vdso.c  -o /home/anders/.cache/tuxmake/builds/current/kselftest/vDSO/vdso_test_gettimeofday
> parse_vdso.c:65:9: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
>                 if (g = h & 0xf0000000)
>                     ~~^~~~~~~~~~~~~~~~
>
> Rework to a parentheses before doing the check.
>
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>

Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>  tools/testing/selftests/vDSO/parse_vdso.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c
> index 413f75620a35..b47b721a4ea4 100644
> --- a/tools/testing/selftests/vDSO/parse_vdso.c
> +++ b/tools/testing/selftests/vDSO/parse_vdso.c
> @@ -62,7 +62,7 @@ static unsigned long elf_hash(const unsigned char *name)
>         while (*name)
>         {
>                 h = (h << 4) + *name++;
> -               if (g = h & 0xf0000000)
> +               if ((g = (h & 0xf0000000)))
>                         h ^= g >> 24;
>                 h &= ~g;
>         }
> --
> 2.33.0
>


-- 
Thanks,
~Nick Desaulniers