Hi Kees,

I love your patch! Perhaps something to improve:

[auto build test WARNING on next-20221109]

url:    https://github.com/intel-lab-lkp/linux/commits/Kees-Cook/exit-Put-an-upper-limit-on-how-often-we-can-oops/20221110-040244
patch link:    https://lore.kernel.org/r/20221109200050.3400857-1-keescook%40chromium.org
patch subject: [PATCH v2 1/6] panic: Separate sysctl logic from CONFIG_SMP
config: m68k-randconfig-r024-20221111
compiler: m68k-linux-gcc (GCC) 12.1.0
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://github.com/intel-lab-lkp/linux/commit/d1ce412a5f8b37476d703c7891272265f7d658f0
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Kees-Cook/exit-Put-an-upper-limit-on-how-often-we-can-oops/20221110-040244
        git checkout d1ce412a5f8b37476d703c7891272265f7d658f0
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> kernel/panic.c:79:5: warning: "CONFIG_SYSCTL" is not defined, evaluates to 0 [-Wundef]
      79 | #if CONFIG_SYSCTL
         |     ^~~~~~~~~~~~~
   kernel/panic.c: In function '__warn':
   kernel/panic.c:616:17: warning: function '__warn' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
     616 |                 vprintk(args->fmt, args->args);
         |                 ^~~~~~~
   kernel/panic.c: At top level:
   kernel/panic.c:639:6: warning: no previous prototype for 'warn_slowpath_fmt' [-Wmissing-prototypes]
     639 | void warn_slowpath_fmt(const char *file, int line, unsigned taint,
         |      ^~~~~~~~~~~~~~~~~


vim +/CONFIG_SYSCTL +79 kernel/panic.c

    78	
  > 79	#if CONFIG_SYSCTL
    80	static struct ctl_table kern_panic_table[] = {
    81	#if defined(CONFIG_SMP)
    82		{
    83			.procname       = "oops_all_cpu_backtrace",
    84			.data           = &sysctl_oops_all_cpu_backtrace,
    85			.maxlen         = sizeof(int),
    86			.mode           = 0644,
    87			.proc_handler   = proc_dointvec_minmax,
    88			.extra1         = SYSCTL_ZERO,
    89			.extra2         = SYSCTL_ONE,
    90		},
    91	#endif
    92		{ }
    93	};
    94	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp