linux-kernel - Re: [PATCH] video: fbdev: s3c-fb: Mark expected switch fall-throughs

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Message-ID: <4771baff-b157-2416-d43b-bf6d8980fbb3@samsung.com>
Date:   Fri, 5 Jul 2019 17:16:22 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Jingoo Han <jingoohan1@...il.com>, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] video: fbdev: s3c-fb: Mark expected switch
 fall-throughs


On 6/25/19 6:01 PM, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
> 
> This patch fixes the following warnings:
> 
> drivers/video/fbdev/s3c-fb.c: In function ‘s3c_fb_blank’:
> drivers/video/fbdev/s3c-fb.c:811:16: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    sfb->enabled &= ~(1 << index);
>    ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
> drivers/video/fbdev/s3c-fb.c:814:2: note: here
>   case FB_BLANK_NORMAL:
>   ^~~~
>   LD [M]  drivers/staging/greybus/gb-light.o
>   CC [M]  drivers/gpu/drm/nouveau/nvkm/subdev/secboot/gp10b.o
> drivers/video/fbdev/s3c-fb.c: In function ‘s3c_fb_check_var’:
> drivers/video/fbdev/s3c-fb.c:286:22: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    var->transp.length = 1;
>    ~~~~~~~~~~~~~~~~~~~^~~
> drivers/video/fbdev/s3c-fb.c:288:2: note: here
>   case 18:
>   ^~~~
> drivers/video/fbdev/s3c-fb.c:314:22: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    var->transp.offset = 24;
>    ~~~~~~~~~~~~~~~~~~~^~~~
> drivers/video/fbdev/s3c-fb.c:316:2: note: here
>   case 24:
>   ^~~~
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> Notice that, in this particular case, the code comments are modified
> in accordance with what GCC is expecting to find.
> 
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Patch queued for v5.3, thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics