linux-kernel - Re: [PATCH 2/3] kcov: remove pointless current != NULL check

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Date:   Tue, 19 Sep 2017 14:57:46 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Victor Chibotaru <tchibo@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>,
        Mark Rutland <mark.rutland@....com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] kcov: remove pointless current != NULL check

On Tue, Sep 19, 2017 at 2:46 PM, Andrey Ryabinin
<aryabinin@...tuozzo.com> wrote:
> __sanitizer_cov_trace_pc() is a hot code, so it's worth
> to remove pointless '!current' check. Current is never NULL.
>
> Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>

Acked-by: Dmitry Vyukov <dvyukov@...gle.com>

> ---
>  kernel/kcov.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/kcov.c b/kernel/kcov.c
> index 2f0e7a7c7afc..14cc8c1a7cad 100644
> --- a/kernel/kcov.c
> +++ b/kernel/kcov.c
> @@ -61,7 +61,7 @@ void notrace __sanitizer_cov_trace_pc(void)
>          * We are interested in code coverage as a function of a syscall inputs,
>          * so we ignore code executed in interrupts.
>          */
> -       if (!t || !in_task())
> +       if (!in_task())
>                 return;
>         mode = READ_ONCE(t->kcov_mode);
>         if (mode == KCOV_MODE_TRACE) {
> --
> 2.13.5
>