linux-kernel - Re: [PATCH] fbdev: sh7760fb: document fallthrough cases

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Message-ID: <CAMuHMdWerZGYz_i8oBK4-ZC+AHZm8c0VW7CXDRX=2PxboWFZ-w@mail.gmail.com>
Date:   Mon, 15 Nov 2021 09:35:09 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Nobuhiro Iwamatsu <iwamatsu.nobuhiro@...esas.com>,
        Manuel Lauss <mano@...rinelk.homelinux.net>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] fbdev: sh7760fb: document fallthrough cases

On Mon, Nov 15, 2021 at 7:33 AM Randy Dunlap <rdunlap@...radead.org> wrote:
> Fix fallthrough warnings in sh776fb.c:
>
> ../drivers/video/fbdev/sh7760fb.c: In function 'sh7760fb_get_color_info':
> ../drivers/video/fbdev/sh7760fb.c:138:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
>   138 |                 lgray = 1;
> ../drivers/video/fbdev/sh7760fb.c:143:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
>   143 |                 lgray = 1;
>
> Just document the current state of code execution/flow.
>
> Fixes: 4a25e41831ee ("video: sh7760fb: SH7760/SH7763 LCDC framebuffer driver")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>

Section 30.4.4 ("Data Format") of the SH7760 Group Hardware
Manual confirms fall-through is appropriate here (especially for
the odd 6 bpp mode).

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds