[linux-rt-devel:linux-5.10.y-rt 231/232] kernel/printk/printk.c:1804:2: warning: function 'printk_sprint' might be a candidate for 'gnu_printf' format attribute

[linux-rt-devel:linux-5.10.y-rt 231/232] kernel/printk/printk.c:1804:2: warning: function 'printk_sprint' might be a candidate for 'gnu_printf' format attribute

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.10.y-rt
head:   8b7f7e411be72aca1b7074014a9537f90b9dd399
commit: acf5b481a0d7ce0e9c1e9a06c9ce4195a759bcdd [231/232] printk: Update the printk code
config: c6x-randconfig-r036-20201201 (attached as .config)
compiler: c6x-elf-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/commit/?id=acf5b481a0d7ce0e9c1e9a06c9ce4195a759bcdd
        git remote add linux-rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
        git fetch --no-tags linux-rt-devel linux-5.10.y-rt
        git checkout acf5b481a0d7ce0e9c1e9a06c9ce4195a759bcdd
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=c6x 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   kernel/printk/printk.c: In function 'printk_sprint':
>> kernel/printk/printk.c:1804:2: warning: function 'printk_sprint' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
    1804 |  text_len = vscnprintf(text, size, fmt, args);
         |  ^~~~~~~~
   /tmp/cc3ZG4qC.s: Assembler messages:
   /tmp/cc3ZG4qC.s:9465: Warning: ignoring changed section attributes for .far

vim +1804 kernel/printk/printk.c

  1797	
  1798	static u16 printk_sprint(char *text, u16 size, int facility, enum log_flags *lflags,
  1799				 const char *fmt, va_list args)
  1800	{
  1801		char *orig_text = text;
  1802		u16 text_len;
  1803	
> 1804		text_len = vscnprintf(text, size, fmt, args);
  1805	
  1806		/* Mark and strip a trailing newline. */
  1807		if (text_len && text[text_len - 1] == '\n') {
  1808			text_len--;
  1809			*lflags |= LOG_NEWLINE;
  1810		}
  1811	
  1812		/* Strip kernel syslog prefix. */
  1813		if (facility == 0) {
  1814			while (text_len >= 2 && printk_get_level(text)) {
  1815				text_len -= 2;
  1816				text += 2;
  1817			}
  1818	
  1819			if (text != orig_text)
  1820				memmove(orig_text, text, text_len);
  1821		}
  1822	
  1823		return text_len;
  1824	}
  1825	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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