linux-kernel - Re: [PATCH] Makefile: Globally enable fall-through warning

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Date:   Mon, 29 Jul 2019 10:22:29 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] Makefile: Globally enable fall-through warning

Hi Gustavo,

On Sun, Jul 28, 2019 at 6:44 PM Gustavo A. R. Silva
<gustavo@...eddedor.com> wrote:
> On 7/28/19 8:58 AM, Guenter Roeck wrote:
> > On Thu, Jun 06, 2019 at 07:46:17PM -0500, Gustavo A. R. Silva wrote:
> >> Now that all the fall-through warnings have been addressed in the
> >> kernel, enable the fall-through warning globally.
> >>
> >
> > Not really "all".
> >
> > powerpc:85xx/sbc8548_defconfig:
> >
> > arch/powerpc/kernel/align.c: In function ‘emulate_spe’:
> > arch/powerpc/kernel/align.c:178:8: error: this statement may fall through
> >
> > Plus many more similar errors in the same file.
> >
> > All sh builds:
> >
> > arch/sh/kernel/disassemble.c: In function 'print_sh_insn':
> > arch/sh/kernel/disassemble.c:478:8: error: this statement may fall through
> >
> > Again, this is seen in several places.
> >
> > mips:cavium_octeon_defconfig:
> >
> > arch/mips/cavium-octeon/octeon-usb.c: In function 'dwc3_octeon_clocks_start':
> > include/linux/device.h:1499:2: error: this statement may fall through
> >
> > None of those are from recent changes. And this is just from my small
> > subset of test builds.
> >
>
> Thank you for letting me know about this. I don't have access to build
> infrastructure like yours.
>
> My build infrastructure is similar to that of Linus.
>
> But if you send me all of those I can create a patch and send it back
> to you to make sure what you see is addressed. If we can coordinate for
> this it'd be great for everybody. :)
>

More to be found in
https://lore.kernel.org/lkml/20190729081727.6094-1-geert@linux-m68k.org/

and I saw the following in my local builds (not detected above due to
kisskb using an older compiler for m68k builds):

arch/m68k/include/asm/amigahw.h: warning: this statement may fall
through [-Wimplicit-fallthrough=]:  => 42:50
drivers/block/ataflop.c: warning: this statement may fall through
[-Wimplicit-fallthrough=]:  => 1728:3
drivers/net/arcnet/com20020-isa.c: warning: this statement may fall
through [-Wimplicit-fallthrough=]:  => 205:13, 203:10, 209:7, 201:11,
207:8
drivers/scsi/sun3_scsi.c: warning: this statement may fall through
[-Wimplicit-fallthrough=]:  => 399:9, 403:9
sound/oss/dmasound/dmasound_atari.c: warning: this statement may fall
through [-Wimplicit-fallthrough=]:  => 1449:24

Thanks for fixing ;-)

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