tree: git://git.infradead.org/users/hch/misc.git set_fs-removal head: 8783f2261aa42693c0e738e22036228c2b26d782 commit: 1d7ac476a3ca018b4c1dc83615cae3e0693e0d71 [80/83] powerpc: remove address space overrides using set_fs() config: powerpc-defconfig (attached as .config) compiler: powerpc64-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 git checkout 1d7ac476a3ca018b4c1dc83615cae3e0693e0d71 # 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(a)intel.com&gt; All error/warnings (new ones prefixed by >>, old ones prefixed by <<): kernel//sched/core.c:2117:6: warning: no previous prototype for 'sched_set_stop_task' [-Wmissing-prototypes] 2117 | void sched_set_stop_task(int cpu, struct task_struct *stop) | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/uaccess.h:9, from include/linux/sched/task.h:11, from include/linux/sched/signal.h:9, from include/linux/sched/cputime.h:5, from kernel//sched/sched.h:11, from kernel//sched/core.c:9: kernel//sched/core.c: In function 'sched_attr_copy_to_user': 20 | (((addr) <= (limit)) && ((size) <= (limit))) | ^~ arch/powerpc/include/asm/uaccess.h:37:3: note: in expansion of macro '__access_ok' 37 | __access_ok((unsigned long)(addr), (size), TASK_SIZE_MAX - 1)) | ^~~~~~~~~~~ 5393 | if (!access_ok(uattr, usize)) | ^~~~~~~~~ -- In file included from include/linux/uaccess.h:9, from include/linux/regset.h:16, from arch/powerpc/kernel/ptrace/ptrace.c:18: include/linux/regset.h: In function 'copy_regset_to_user': 20 | (((addr) <= (limit)) && ((size) <= (limit))) | ^~ arch/powerpc/include/asm/uaccess.h:37:3: note: in expansion of macro '__access_ok' 37 | __access_ok((unsigned long)(addr), (size), TASK_SIZE_MAX - 1)) | ^~~~~~~~~~~ 376 | if (!access_ok(data, size)) | ^~~~~~~~~ include/linux/regset.h: In function 'copy_regset_from_user': 20 | (((addr) <= (limit)) && ((size) <= (limit))) | ^~ arch/powerpc/include/asm/uaccess.h:37:3: note: in expansion of macro '__access_ok' 37 | __access_ok((unsigned long)(addr), (size), TASK_SIZE_MAX - 1)) | ^~~~~~~~~~~ include/linux/regset.h:402:7: note: in expansion of macro 'access_ok' 402 | if (!access_ok(data, size)) | ^~~~~~~~~ cc1: all warnings being treated as errors vim +20 arch/powerpc/include/asm/uaccess.h 14 15 /* 16 * This check is sufficient because there is a large enough 17 * gap between user addresses and the kernel addresses 18 */ 19 #define __access_ok(addr, size, limit) \ 21 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org