linux-kernel - Re: [PATCH] iio: si1133: fix format string warnings

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Date:   Thu, 27 May 2021 09:17:24 -0700
From:   Joe Perches <joe@...ches.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Maxime Roussin-Bélanger 
        <maxime.roussinbelanger@...il.com>,
        Jean-Francois Dagenais <jeff.dagenais@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] iio: si1133: fix format string warnings

On Sun, 2021-05-16 at 10:36 +0100, Jonathan Cameron wrote:
> On Fri, 14 May 2021 10:45:02 -0700
> Nathan Chancellor <nathan@...nel.org> wrote:
> > On 5/14/2021 6:59 AM, Arnd Bergmann wrote:
> > > From: Arnd Bergmann <arnd@...db.de>
> > > 
> > > clang complains about multiple instances of printing an integer
> > > using the %hhx format string:
> > > 
> > > drivers/iio/light/si1133.c:982:4: error: format specifies type 'unsigned char' but the argument has type 'unsigned int' [-Werror,-Wformat]
> > >                   part_id, rev_id, mfr_id);
> > >                   ^~~~~~~
> > > 
> > > Print them as a normal integer instead, leaving the "#02"
> > > length modifier.
[]
> > > diff --git a/drivers/iio/light/si1133.c b/drivers/iio/light/si1133.c
[]
> > > @@ -978,11 +978,11 @@ static int si1133_validate_ids(struct iio_dev *iio_dev)
> > >   		return err;
> > >   
> > > 
> > >   	dev_info(&iio_dev->dev,
> > > -		 "Device ID part %#02hhx rev %#02hhx mfr %#02hhx\n",
> > > +		 "Device ID part %#02x rev %#02x mfr %#02x\n",
> > >   		 part_id, rev_id, mfr_id);
> > >   	if (part_id != SI1133_PART_ID) {
> > >   		dev_err(&iio_dev->dev,
> > > -			"Part ID mismatch got %#02hhx, expected %#02x\n",
> > > +			"Part ID mismatch got %#02x, expected %#02x\n",

which is almost certainly wrong.
the length specification includes the # which is already 2 bytes.

Likely these should be 0x%02x

> > >   			part_id, SI1133_PART_ID);