linux-kernel - Re: [PATCH] ASoC: core: Fix Sparse incompatible types warning

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Date:	Wed, 09 Apr 2014 13:12:14 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: core: Fix Sparse incompatible types warning

On śro, 2014-04-09 at 12:57 +0200, Lars-Peter Clausen wrote:
> On 04/09/2014 09:21 AM, Krzysztof Kozlowski wrote:
> > Fix following Sparse warning:
> > sound/soc/soc-core.c:252:20: error: incompatible types in comparison expression (different type sizes)
> >
> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> > ---
> >   sound/soc/soc-core.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
> > index 051c006281f5..41f6178249df 100644
> > --- a/sound/soc/soc-core.c
> > +++ b/sound/soc/soc-core.c
> > @@ -249,7 +249,7 @@ static ssize_t codec_reg_write_file(struct file *file,
> >   	struct snd_soc_codec *codec = file->private_data;
> >   	int ret;
> >
> > -	buf_size = min(count, (sizeof(buf)-1));
> > +	buf_size = min(count, (size_t)(sizeof(buf)-1));
> 
> But shouldn't the type of sizeof already be size_t?

Hmmm... yes it should. It looks like a false positive from Sparse so the
commit message should be rather "Suppress" than "Fix".

Best regards,
Krzysztof

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