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

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Date:   Mon, 15 Nov 2021 17:30:58 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.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>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] fbdev: sh7760fb: document fallthrough cases

On Mon, Nov 15, 2021 at 09:35:09AM +0100, Geert Uytterhoeven wrote:
> 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>

I'm taking this in my -next tree[1].

Thanks
--
Gustavo

[1] https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/log/?h=for-next/kspp-misc-fixes