From: Ard Biesheuvel <ardb@kernel.org>
To: Nathan Chancellor <natechancellor@gmail.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
Douglas Anderson <dianders@chromium.org>,
Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
clang-built-linux <clang-built-linux@googlegroups.com>
Subject: Re: [PATCH] crypto: xor - Remove unused variable count in do_xor_speed
Date: Wed, 7 Oct 2020 08:33:54 +0200 [thread overview]
Message-ID: <CAMj1kXF0L03+pOEyvZXpfxdd=FRyQia7k-tf9XZ4sSpwEpLmnQ@mail.gmail.com> (raw)
In-Reply-To: <20201006195848.707504-1-natechancellor@gmail.com>
On Tue, 6 Oct 2020 at 21:59, Nathan Chancellor <natechancellor@gmail.com> wrote:
>
> Clang warns:
>
> crypto/xor.c:101:4: warning: variable 'count' is uninitialized when used
> here [-Wuninitialized]
> count++;
> ^~~~~
> crypto/xor.c:86:17: note: initialize the variable 'count' to silence
> this warning
> int i, j, count;
> ^
> = 0
> 1 warning generated.
>
> After the refactoring to use ktime that happened in this function, count
> is only assigned, never read. Just remove the variable to get rid of the
> warning.
>
> Fixes: c055e3eae0f1 ("crypto: xor - use ktime for template benchmarking")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1171
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
> ---
> crypto/xor.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/crypto/xor.c b/crypto/xor.c
> index a0badbc03577..eacbf4f93990 100644
> --- a/crypto/xor.c
> +++ b/crypto/xor.c
> @@ -83,7 +83,7 @@ static void __init
> do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)
> {
> int speed;
> - int i, j, count;
> + int i, j;
> ktime_t min, start, diff;
>
> tmpl->next = template_list;
> @@ -98,8 +98,6 @@ do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)
> mb(); /* prevent loop optimzation */
> tmpl->do_2(BENCH_SIZE, b1, b2);
> mb();
> - count++;
> - mb();
> }
> diff = ktime_sub(ktime_get(), start);
> if (diff < min)
>
> base-commit: ed4424f2fb02497b0ea92bf58c533c598c0da1d3
> --
> 2.29.0.rc0
>
next prev parent reply other threads:[~2020-10-07 6:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-06 19:58 [PATCH] crypto: xor - Remove unused variable count in do_xor_speed Nathan Chancellor
2020-10-06 21:35 ` Doug Anderson
2020-10-07 6:33 ` Ard Biesheuvel [this message]
2020-10-08 5:44 ` Herbert Xu
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