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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Date:   Fri, 7 May 2021 18:00:31 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Michael Zaidman <michael.zaidman@...il.com>,
        kernel test robot <lkp@...el.com>
Cc:     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>
Subject: Re: [kbuild-all] Re: drivers/hid/hid-ft260.c:794:44: warning: format
 specifies type 'short' but the argument has type 'int'



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