linux-kernel - Re: [PATCH] lib/cmdline.c: mark expected switch fall-throughs

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Message-ID: <CAGXu5j+N+tqx+1z-1zq2_Egantdcr6YSm_1s4XeSUN427zDhQA@mail.gmail.com>
Date:   Sat, 26 Jan 2019 13:18:25 +1300
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] lib/cmdline.c: mark expected switch fall-throughs

On Sat, Jan 26, 2019 at 9:31 AM Gustavo A. R. Silva
<gustavo@...eddedor.com> wrote:
>
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
>
> This patch fixes the following warnings:
>
> lib/cmdline.c:137:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
> lib/cmdline.c:140:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
> lib/cmdline.c:143:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
> lib/cmdline.c:146:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
> lib/cmdline.c:149:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
>
> Warning level 3 was used: -Wimplicit-fallthrough=3
>
> This patch is part of the ongoing efforts to enabling -Wimplicit-fallthrough.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  lib/cmdline.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/lib/cmdline.c b/lib/cmdline.c
> index 171c19b6888e..dc59d6216318 100644
> --- a/lib/cmdline.c
> +++ b/lib/cmdline.c
> @@ -135,18 +135,23 @@ unsigned long long memparse(const char *ptr, char **retptr)
>         case 'E':
>         case 'e':
>                 ret <<= 10;
> +               /* fall through */
>         case 'P':
>         case 'p':
>                 ret <<= 10;
> +               /* fall through */
>         case 'T':
>         case 't':
>                 ret <<= 10;
> +               /* fall through */
>         case 'G':
>         case 'g':
>                 ret <<= 10;
> +               /* fall through */
>         case 'M':
>         case 'm':
>                 ret <<= 10;
> +               /* fall through */
>         case 'K':
>         case 'k':
>                 ret <<= 10;
> --
> 2.20.1
>


-- 
Kees Cook