tree: https://github.com/weiny2/linux-kernel.git tip-pks-2021-v4-br head: f2cb2a1537eca13d7a64114f580a1e3a7fb3acc8 commit: 585599523a4df2a1126e0348c1249262a8422efb [8/11] x86/pks: Preserve the PKRS MSR on context switch config: i386-randconfig-r021-20210323 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/weiny2/linux-kernel/commit/585599523a4df2a1126e0348c12... git remote add weiny2 https://github.com/weiny2/linux-kernel.git git fetch --no-tags weiny2 tip-pks-2021-v4-br git checkout 585599523a4df2a1126e0348c1249262a8422efb # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/x86/kernel/process.c: In function 'flush_thread': 200 | pks_init_task(tsk); | ^~~~~~~~~~~~~ | shm_init_task cc1: some warnings being treated as errors vim +200 arch/x86/kernel/process.c 190 191 void flush_thread(void) 192 { 193 struct task_struct *tsk = current; 194 195 flush_ptrace_hw_breakpoint(tsk); 196 memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array)); 197 198 fpu__clear_all(&tsk->thread.fpu); 199 201 } 202 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org