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

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Message-ID: <5f52a67e-d1b8-4f2f-d6f3-309e6683c02b@embeddedor.com>
Date:   Wed, 20 Feb 2019 11:21:21 -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 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.

--
Gustavo