[linux-rt-devel:linux-5.4.y-rt 45/325] kernel/printk/printk.c:1982:5: warning: no previous prototype for 'vprintk_default'

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.4.y-rt
head:   5fbf1e70f11dba64cc05c9d85120a3aa7c67a4a2
commit: 35a550e0af7946f894d89a6e6f2d0991f71547e6 [45/325] printk: remove unused code
config: h8300-randconfig-r023-20210108 (attached as .config)
compiler: h8300-linux-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=35a550e0af7946f894d89a6e6f2d0991f71547e6
        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-5.4.y-rt
        git checkout 35a550e0af7946f894d89a6e6f2d0991f71547e6
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 

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:1982:5: warning: no previous prototype for 'vprintk_default' [-Wmissing-prototypes]
    1982 | int vprintk_default(const char *fmt, va_list args)
         |     ^~~~~~~~~~~~~~~
   kernel/printk/printk.c: In function 'vprintk_default':
>> kernel/printk/printk.c:1993:2: warning: function 'vprintk_default' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
    1993 |  r = vprintk_emit(0, LOGLEVEL_DEFAULT, NULL, 0, fmt, args);
         |  ^
   kernel/printk/printk.c: In function 'vprintk_deferred':
>> kernel/printk/printk.c:2747:2: warning: function 'vprintk_deferred' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
    2747 |  return vprintk_emit(0, LOGLEVEL_SCHED, NULL, 0, fmt, args);
         |  ^~~~~~


vim +/vprintk_default +1982 kernel/printk/printk.c

^1da177e4c3f415 kernel/printk.c        Linus Torvalds           2005-04-16  1981  
a0cba2179ea4c18 kernel/printk/printk.c Linus Torvalds           2016-08-09 @1982  int vprintk_default(const char *fmt, va_list args)
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1983) {
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1984) 	int r;
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1985) 
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1986) #ifdef CONFIG_KGDB_KDB
34aaff40b42148b kernel/printk/printk.c Petr Mladek              2016-12-14  1987  	/* Allow to pass printk() to kdb but avoid a recursion. */
34aaff40b42148b kernel/printk/printk.c Petr Mladek              2016-12-14  1988  	if (unlikely(kdb_trap_printk && kdb_printf_cpu < 0)) {
f7d4ca8bbfda23b kernel/printk/printk.c Daniel Thompson          2014-11-07  1989  		r = vkdb_printf(KDB_MSGSRC_PRINTK, fmt, args);
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1990) 		return r;
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1991) 	}
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1992) #endif
a0cba2179ea4c18 kernel/printk/printk.c Linus Torvalds           2016-08-09 @1993  	r = vprintk_emit(0, LOGLEVEL_DEFAULT, NULL, 0, fmt, args);
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1994) 
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1995) 	return r;
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1996) }
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1997) EXPORT_SYMBOL_GPL(vprintk_default);
afdc34a3d3b823a kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  1998) 

:::::: The code@line 1982 was first introduced by commit
:::::: a0cba2179ea4c1820fce2ee046b6ed90ecc56196 Revert "printk: create pr_<level> functions"

:::::: TO: Linus Torvalds <torvalds@linux-foundation.org>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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

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