linux-ext4 - Re: [PATCH 2/2] Compiler Attributes: auxdisplay: panel: use _

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Message-ID: <CAGXu5j+3pR2mfcdbURv7MrPxUVjmjQEDRHH8BLpTNGiasJs1pg@mail.gmail.com>
Date:   Mon, 22 Oct 2018 07:10:02 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Olof Johansson <olof@...m.net>,
        Konstantin Ryabitsev <konstantin@...uxfoundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Paul Lawrence <paullawrence@...gle.com>,
        Sandipan Das <sandipan@...ux.vnet.ibm.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Paul Burton <paul.burton@...s.com>,
        David Rientjes <rientjes@...gle.com>, Willy Tarreau <w@....eu>,
        Martin Sebor <msebor@...il.com>,
        Christopher Li <sparse@...isli.org>,
        Jonathan Corbet <corbet@....net>,
        "Theodore Ts'o" <tytso@....edu>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Joe Perches <joe@...ches.com>, Arnd Bergmann <arnd@...db.de>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Stefan Agner <stefan@...er.ch>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Sparse Mailing-list <linux-sparse@...r.kernel.org>,
        linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH 2/2] Compiler Attributes: auxdisplay: panel: use __fallthrough

On Sun, Oct 21, 2018 at 10:14 AM, Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
> Let gcc know these cases are meant to fall through to the next label
> by annotating them with the new __fallthrough statement attribute;
> and remove the comment since it conveys the same information
> (which was also parsed by gcc to suppress the warning).
>
> Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
> ---
>  drivers/auxdisplay/panel.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c
> index 21b9b2f2470a..0755034e49ba 100644
> --- a/drivers/auxdisplay/panel.c
> +++ b/drivers/auxdisplay/panel.c
> @@ -1367,7 +1367,7 @@ static void panel_process_inputs(void)
>                                 break;
>                         input->rise_timer = 0;
>                         input->state = INPUT_ST_RISING;
> -                       /* fall through */
> +                       __fallthrough;
>                 case INPUT_ST_RISING:
>                         if ((phys_curr & input->mask) != input->value) {
>                                 input->state = INPUT_ST_LOW;
> @@ -1380,11 +1380,11 @@ static void panel_process_inputs(void)
>                         }
>                         input->high_timer = 0;
>                         input->state = INPUT_ST_HIGH;
> -                       /* fall through */
> +                       __fallthrough;
>                 case INPUT_ST_HIGH:
>                         if (input_state_high(input))
>                                 break;
> -                       /* fall through */
> +                       __fallthrough;
>                 case INPUT_ST_FALLING:
>                         input_state_falling(input);
>                 }
> --
> 2.17.1
>

I would prefer we continue to use the comment style until we've got
confirmed support for (at least) Clang, Coverity, CPPcheck, smatch,
and eclipse.

-Kees

-- 
Kees Cook
Pixel Security