tree:   https://github.com/linuxppc/linux next-test
head:   2f397c4b5a5bc869998bc901f9501d0d8ff1ebb4
commit: 4ba6650bebb051b165318ad9c60d6a5f3b6f86b3 [74/105] powerpc/32s: Move KUEP locking/unlocking in C
config: powerpc-randconfig-m031-20210327 (attached as .config)
compiler: powerpc-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://github.com/linuxppc/linux/commit/4ba6650bebb051b165318ad9c60d6a5f3b6f86b3
        git remote add linuxppc https://github.com/linuxppc/linux
        git fetch --no-tags linuxppc next-test
        git checkout 4ba6650bebb051b165318ad9c60d6a5f3b6f86b3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 

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 >>):

>> arch/powerpc/mm/book3s32/kuep.c:30:6: warning: no previous prototype for 'kuep_lock' [-Wmissing-prototypes]
      30 | void kuep_lock(void)
         |      ^~~~~~~~~
>> arch/powerpc/mm/book3s32/kuep.c:35:6: warning: no previous prototype for 'kuep_unlock' [-Wmissing-prototypes]
      35 | void kuep_unlock(void)
         |      ^~~~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for HOTPLUG_CPU
   Depends on SMP && (PPC_PSERIES || PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE
   Selected by
   - PM_SLEEP_SMP && SMP && (ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE && PM_SLEEP


vim +/kuep_lock +30 arch/powerpc/mm/book3s32/kuep.c

    29	
  > 30	void kuep_lock(void)
    31	{
    32		kuep_update(mfsr(0) | SR_NX);
    33	}
    34	
  > 35	void kuep_unlock(void)

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