[staging:staging-testing 383/386] drivers//tty/tty_io.c:348:11: warning: assignment discards 'const' qualifier from pointer target type

kbuild test robot fengguang.wu at intel.com
Sun Jun 25 17:24:43 UTC 2017


tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git staging-testing
head:   2a38eb6552c934a13e1f1b8c579147fac9c94efb
commit: 9a71d0257f1f63d64015f7d2c25485272df4d535 [383/386] tty: add function to convert device name to number
config: blackfin-allyesconfig (attached as .config)
compiler: bfin-uclinux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 9a71d0257f1f63d64015f7d2c25485272df4d535
        # save the attached .config to linux build tree
        make.cross ARCH=blackfin 

All warnings (new ones prefixed by >>):

   drivers//tty/tty_io.c: In function 'tty_dev_name_to_number':
>> drivers//tty/tty_io.c:348:11: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     for (str = name; *str && !isdigit(*str); str++)
              ^

vim +/const +348 drivers//tty/tty_io.c

   332	 *
   333	 *	This function converts device names like ttyS0 or ttyUSB1 into dev_t
   334	 *	like (4, 64) or (188, 1). If no corresponding driver is registered then
   335	 *	the function returns -ENODEV.
   336	 *
   337	 *	Locking: this acquires tty_mutex to protect the tty_drivers list from
   338	 *		being modified while we are traversing it, and makes sure to
   339	 *		release it before exiting.
   340	 */
   341	int tty_dev_name_to_number(const char *name, dev_t *number)
   342	{
   343		struct tty_driver *p;
   344		int ret;
   345		int index, prefix_length = 0;
   346		char *str;
   347	
 > 348		for (str = name; *str && !isdigit(*str); str++)
   349			;
   350	
   351		if (!*str)
   352			return -EINVAL;
   353	
   354		ret = kstrtoint(str, 10, &index);
   355		if (ret)
   356			return ret;

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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