linux-kernel - Re: linux-next: build warning after merge of the nand tree

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Message-ID: <20190403094947.1d9be502@xps13>
Date:   Wed, 3 Apr 2019 09:49:47 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Boris Brezillon <boris.brezillon@...labora.com>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paul Cercueil <paul@...pouillou.net>
Subject: Re: linux-next: build warning after merge of the nand tree

Hi Stephen,

Stephen Rothwell <sfr@...b.auug.org.au> wrote on Wed, 3 Apr 2019
10:22:39 +1100:

> Hi all,
> 
> After merging the nand tree, today's linux-next build (x86_64
> allmodconfig) produced this warning:
> 
> drivers/mtd/nand/raw/ingenic/jz4725b_bch.c: In function 'jz4725b_bch_read_parity':
> drivers/mtd/nand/raw/ingenic/jz4725b_bch.c:147:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    dest8[2] = (val >> 16) & 0xff;
>    ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
> drivers/mtd/nand/raw/ingenic/jz4725b_bch.c:148:2: note: here
>   case 2: /* fall-through */
>   ^~~~
> drivers/mtd/nand/raw/ingenic/jz4725b_bch.c:149:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    dest8[1] = (val >> 8) & 0xff;
>    ~~~~~~~~~^~~~~~~~~~~~~~~~~~~
> drivers/mtd/nand/raw/ingenic/jz4725b_bch.c:150:2: note: here
>   case 1: /* fall-through */
>   ^~~~
> 
> Introduced by commit
> 
>   acb29396f956 ("mtd: rawnand: ingenic: Add support for the JZ4725B")
> 
> I get this warning because I am building with -Wimplicit-fallthrough
> in attempt to catch new additions early.  The gcc warning can be turned
> off by adding a /* fall through */ comment at the point the fall through
> happens (i.e. before the next case label).
> 

Thanks for the warnings, I moved the fall-through comments so the
warnings are gone.

I also added -Wextra in my "mtd-builds" setup to catch these earlier.


Thanks,
Miquèl

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