tree: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git pks/v0.0 head: eed09ce6622d550ab5b10a86e7dd6c2ff6bd59d9 commit: 216cf0b8e9541e52432bdee972971826c5e5011d [22/27] x86/pks: unprotect page tables before freeing the memory config: i386-randconfig-a016-20211104 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 847a6807332b13f43704327c2d30103ec0347c77) 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/rppt/linux.git/commit/?id=216cf0b8e9541e52432bdee972971826c5e5011d git remote add rppt https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git git fetch --no-tags rppt pks/v0.0 git checkout 216cf0b8e9541e52432bdee972971826c5e5011d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> arch/x86/mm/pgtable.c:20:12: warning: function '_pks_unprotect' has internal linkage but is not defined [-Wundefined-internal] static int _pks_unprotect(struct page *page, unsigned int cnt); ^ arch/x86/mm/pgtable.c:107:3: note: used here _pks_unprotect(pte, 1); ^ arch/x86/mm/pgtable.c:18:34: warning: unused variable 'gpc_pks' [-Wunused-variable] static struct grouped_page_cache gpc_pks; ^ 2 warnings generated. vim +/_pks_unprotect +20 arch/x86/mm/pgtable.c 17 18 static struct grouped_page_cache gpc_pks; 19 static bool pks_page_en; > 20 static int _pks_unprotect(struct page *page, unsigned int cnt); 21 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org