linux-kernel - Re: [PATCH] iio: mma8452: mark expected switch fall-through

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Message-ID: <e612e707-4a54-7b59-e350-139766529316@embeddedor.com>
Date:   Wed, 20 Feb 2019 12:07:28 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] iio: mma8452: mark expected switch fall-through



On 2/20/19 11:21 AM, Gustavo A. R. Silva wrote:
> 
> 
> On 2/20/19 6:17 AM, Jonathan Cameron wrote:
>> On Mon, 11 Feb 2019 16:23:18 -0600
>> "Gustavo A. R. Silva" <gustavo@...eddedor.com> wrote:
>>
>>> In preparation to enabling -Wimplicit-fallthrough, mark switch
>>> cases where we are expecting to fall through.
>>>
>>> This patch fixes the following warning:
>>>
>>> drivers/iio/accel/mma8452.c: In function ‘mma8452_probe’:
>>> drivers/iio/accel/mma8452.c:1581:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>>>    if (ret == data->chip_info->chip_id)
>>>       ^
>>> drivers/iio/accel/mma8452.c:1584:2: note: here
>>>   default:
>>>   ^~~~~~~
>>>
>>> Warning level 3 was used: -Wimplicit-fallthrough=3
>>>
>>> Notice that, in this particular case, the code comment is 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>
>> I know Peter probably won't like this, as it doesn't
>> read a as well, with the else dropped, but I'm going to take
>> it as we have had a lot of bugs caught by this code and this
>> is generating a false positive.
>>
>> Applied to the togreg branch of iio.git and pushed out as testing
>> for the autobuilders to play with it.
>>
> 
> Thanks, Jonathan.
> 

BTW, Jonathan, I wonder if you can apply this one too:

https://lore.kernel.org/patchwork/patch/996804/

Thanks
--
Gustavo