linux-kernel - Re: [PATCH v3] mtd: rawnand: Mark expected switch fall-throughs

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Message-ID: <20190401172309.4c6929a8@xps13>
Date:   Mon, 1 Apr 2019 17:23:09 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Boris Brezillon <bbrezillon@...nel.org>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Wan ZongShun <mcuos.com@...il.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v3] mtd: rawnand: Mark expected switch fall-throughs

Hi Gustavo,

"Gustavo A. R. Silva" <gustavo@...eddedor.com> wrote on Fri, 8 Feb 2019
11:49:30 -0600:

> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
> 
> This patch fixes the following warning:
> 
> drivers/mtd/nand/raw/diskonchip.c: In function ‘doc_probe’:
> ./include/linux/printk.h:303:2: warning: this statement may fall through [-Wimplicit-fallthrough=]
>   printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
>   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/mtd/nand/raw/diskonchip.c:1479:4: note: in expansion of macro ‘pr_err’
>     pr_err("DiskOnChip Millennium Plus 32MB is not supported, ignoring.\n");
>     ^~~~~~
> drivers/mtd/nand/raw/diskonchip.c:1480:3: note: here
>    default:
>    ^~~~~~~
> drivers/mtd/nand/raw/nandsim.c: In function ‘ns_init_module’:
> drivers/mtd/nand/raw/nandsim.c:2254:22: warning: this statement may fall through [-Wimplicit-fallthrough=]
>     chip->bbt_options |= NAND_BBT_NO_OOB;
> drivers/mtd/nand/raw/nandsim.c:2255:2: note: here
>   case 1:
>   ^~~~
> drivers/mtd/nand/raw/nuc900_nand.c: In function ‘nuc900_nand_command_lp’:
> ./arch/x86/include/asm/io.h:91:22: warning: this statement may fall through [-Wimplicit-fallthrough=]
>  #define __raw_writel __writel
> drivers/mtd/nand/raw/nuc900_nand.c:52:2: note: in expansion of macro ‘__raw_writel’
>   __raw_writel((val), (dev)->reg + REG_SMCMD)
>   ^~~~~~~~~~~~
> drivers/mtd/nand/raw/nuc900_nand.c:196:3: note: in expansion of macro ‘write_cmd_reg’
>    write_cmd_reg(nand, NAND_CMD_READSTART);
>    ^~~~~~~~~~~~~
> drivers/mtd/nand/raw/nuc900_nand.c:197:2: note: here
>   default:
>   ^~~~~~~
> drivers/mtd/nand/raw/omap_elm.c: In function ‘elm_context_restore’:
> drivers/mtd/nand/raw/omap_elm.c:512:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
>     elm_write_reg(info, ELM_SYNDROME_FRAGMENT_4 + offset,
>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>       regs->elm_syndrome_fragment_4[i]);
>       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/mtd/nand/raw/omap_elm.c:514:3: note: here
>    case BCH8_ECC:
>    ^~~~
> drivers/mtd/nand/raw/omap_elm.c:517:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
>     elm_write_reg(info, ELM_SYNDROME_FRAGMENT_2 + offset,
>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>       regs->elm_syndrome_fragment_2[i]);
>       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/mtd/nand/raw/omap_elm.c:519:3: note: here
>    case BCH4_ECC:
>    ^~~~
> drivers/mtd/nand/raw/omap_elm.c: In function ‘elm_context_save’:
> drivers/mtd/nand/raw/omap_elm.c:466:37: warning: this statement may fall through [-Wimplicit-fallthrough=]
>     regs->elm_syndrome_fragment_4[i] = elm_read_reg(info,
>     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
>       ELM_SYNDROME_FRAGMENT_4 + offset);
>       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/mtd/nand/raw/omap_elm.c:468:3: note: here
>    case BCH8_ECC:
>    ^~~~
> drivers/mtd/nand/raw/omap_elm.c:471:37: warning: this statement may fall through [-Wimplicit-fallthrough=]
>     regs->elm_syndrome_fragment_2[i] = elm_read_reg(info,
>     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
>       ELM_SYNDROME_FRAGMENT_2 + offset);
>       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/mtd/nand/raw/omap_elm.c:473:3: note: here
>    case BCH4_ECC:
>    ^~~~
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> This patch is part of the ongoing efforts to enabling
> -Wimplicit-fallthrough.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---

Applied to git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git
on nand/next.

Thanks,
Miquèl