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

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Date:   Tue, 25 Jun 2019 09:52:23 -0700
From:   Joe Perches <joe@...ches.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH] video: fbdev: s3c-fb: Mark expected switch fall-throughs

On Tue, 2019-06-25 at 11:01 -0500, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
[]
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.

Just enable the thing already.

If you stopped trying to do it all yourself, others
will help resolve any new build warnings.

For instance: a build of -next x86/64 defconfig has 2.  nbd.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 5102b2bbd224..df909ffdfcdb 100644
--- a/Makefile
+++ b/Makefile
@@ -690,6 +690,7 @@ endif # may-sync-config
 endif # $(dot-config)
 
 KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
+KBUILD_CFLAGS	+= $(call cc-option, -Wimplicit-fallthrough)
 KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
 KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
 KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)