linux-kernel - Re: [kbuild-all] Re: drivers/hid/hid-ft260.c:794:44: warning: format specifies type 'short' but the argument has type 'int'

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Message-ID: <20210509182558.GA4940@michael-VirtualBox>
Date:   Sun, 9 May 2021 21:25:58 +0300
From:   Michael Zaidman <michael.zaidman@...il.com>
To:     "Chen, Rong A" <rong.a.chen@...el.com>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org,
        Jiri Kosina <jkosina@...e.cz>, Jiri Kosina <jikos@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        michael.zaidman@...il.com
Subject: Re: [kbuild-all] Re: drivers/hid/hid-ft260.c:794:44: warning: format
 specifies type 'short' but the argument has type 'int'

On Fri, May 07, 2021 at 06:00:31PM +0800, Chen, Rong A wrote:
> 
> 
> On 5/6/2021 7:55 PM, Michael Zaidman wrote:
> > On Thu, May 06, 2021 at 06:47:46AM +0800, kernel test robot wrote:
> > > 
> > >     drivers/hid/hid-ft260.c:515:59: warning: variable 'len' is uninitialized when used here [-Wuninitialized]
> > >                     hid_err(hdev, "%s: unsupported wr len: %d\n", __func__, len);
> > >                                                                             ^~~
> > >     include/linux/hid.h:1190:30: note: expanded from macro 'hid_err'
> > >             dev_err(&(hid)->dev, fmt, ##__VA_ARGS__)
> > >                                         ^~~~~~~~~~~
> > >     include/linux/dev_printk.h:112:32: note: expanded from macro 'dev_err'
> > >             _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
> > >                                           ^~~~~~~~~~~
> > >     drivers/hid/hid-ft260.c:507:9: note: initialize the variable 'len' to silence this warning
> > >             int len, ret;
> > >                    ^
> > >                     = 0
> > 
> > This warning has already been found and fixed by Dan Carpenter in
> > the "HID: ft260: fix an error message in ft260_i2c_write_read()" commit
> > on March 18, 2021.
> 
> Hi Michael,
> 
> This report is about the below warning prefixed by '>>', it's still in
> mainline:
> 
> >> drivers/hid/hid-ft260.c:794:44: warning: format specifies type 'short'
> but the argument has type 'int' [-Wformat]
>            return scnprintf(buf, PAGE_SIZE, "%hi\n", le16_to_cpu(*field));
>                                              ~~~     ^~~~~~~~~~~~~~~~~~~
>                                              %i
> 
> Best Regards,
> Rong Chen

Hi Rong,

Sure, but since the report states - "2 warnings generated", I addressed
the first one for which we already have a commit with the fix.

I tried to reproduce the second warning you referred to in this e-mail,
but make.cross script failed since the "clang-latest" directory does not
exist under the "0day". As a workaround, I modified the make command
generated by the script replacing all "clang-latest" occurrences with
"clang" and run it manually.

Another workaround could be to use the symbolic link as reported in the
https://groups.google.com/g/clang-built-linux/c/qCjZblHi8lY/m/eBEEl2JxBgAJ
on March 27, 2021.

Anyway, I reproduced this warning and am going to submit a fix shortly.

Thanks,
Michael