[djiang:cxl-security 1/19] include/linux/memregion.h:54:9: error: implicit declaration of function 'WARN_ON_ONCE'

[djiang:cxl-security 1/19] include/linux/memregion.h:54:9: error: implicit declaration of function 'WARN_ON_ONCE'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djiang/linux.git cxl-security
head:   3b2ea8468d5dbe2e7b61dcd86cc3aeadfe766d07
commit: d8fab77dd9512ae56e653afddbef9351da206679 [1/19] memregion: Add cpu_cache_invalidate_memregion() interface
config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20220922/202209220119.QSB1o664-lkp@intel.com/config)
compiler: s390-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://git.kernel.org/pub/scm/linux/kernel/git/djiang/linux.git/commit/?id=d8fab77dd9512ae56e653afddbef9351da206679
        git remote add djiang https://git.kernel.org/pub/scm/linux/kernel/git/djiang/linux.git
        git fetch --no-tags djiang cxl-security
        git checkout d8fab77dd9512ae56e653afddbef9351da206679
        # 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=s390 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   In file included from drivers/cxl/core/region.c:3:
   include/linux/memregion.h:52:5: warning: no previous prototype for 'cpu_cache_invalidate_memregion' [-Wmissing-prototypes]
      52 | int cpu_cache_invalidate_memregion(int res_desc)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/memregion.h: In function 'cpu_cache_invalidate_memregion':
>> include/linux/memregion.h:54:9: error: implicit declaration of function 'WARN_ON_ONCE' [-Werror=implicit-function-declaration]
      54 |         WARN_ON_ONCE("CPU cache invalidation required");
         |         ^~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/WARN_ON_ONCE +54 include/linux/memregion.h

    51	
    52	int cpu_cache_invalidate_memregion(int res_desc)
    53	{
  > 54		WARN_ON_ONCE("CPU cache invalidation required");

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

Re: [djiang:cxl-security 1/19] include/linux/memregion.h:54:9: error: implicit declaration of function 'WARN_ON_ONCE'

[Davidlohr Bueso]

On Thu, 22 Sep 2022, kernel test robot wrote:
>
>    51
>    52	int cpu_cache_invalidate_memregion(int res_desc)
>    53	{
>  > 54		WARN_ON_ONCE("CPU cache invalidation required");
>

Looks like memregion.h needs to include kernel.h. I'll send a new version
along with EOPNOTSUPP return.