tree: https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/fixes head: 825cc79966034d2ab820a693fcb3b84565edd715 commit: 2fa01daa924b6f5b2ed073acb27574b11e7c3e74 [8/13] membarrier: Make the post-switch-mm barrier explicit config: h8300-randconfig-m031-20210321 (attached as .config) compiler: h8300-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://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?id... git remote add luto https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git git fetch --no-tags luto x86/fixes git checkout 2fa01daa924b6f5b2ed073acb27574b11e7c3e74 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 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 >>): kernel/kthread.c: In function 'kthread_use_mm': 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from <command-line>: 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~ include/linux/compiler_types.h:300:9: note: in definition of macro '__compiletime_assert' 300 | if (!(condition)) \ | ^~~~~~~~~ include/linux/compiler_types.h:320:2: note: in expansion of macro '_compiletime_assert' 320 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:2: note: in expansion of macro 'compiletime_assert' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:21: note: in expansion of macro '__native_word' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~ include/asm-generic/rwonce.h:49:2: note: in expansion of macro 'compiletime_assert_rwonce_type' 49 | compiletime_assert_rwonce_type(x); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/h8300/include/asm/atomic.h:15:25: note: in expansion of macro 'READ_ONCE' 15 | #define atomic_read(v) READ_ONCE((v)->counter) | ^~~~~~~~~ kernel/kthread.c:1306:30: note: in expansion of macro 'atomic_read' 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~~~~~~~~~~ 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~ include/linux/compiler_types.h:300:9: note: in definition of macro '__compiletime_assert' 300 | if (!(condition)) \ | ^~~~~~~~~ include/linux/compiler_types.h:320:2: note: in expansion of macro '_compiletime_assert' 320 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:2: note: in expansion of macro 'compiletime_assert' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:21: note: in expansion of macro '__native_word' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~ include/asm-generic/rwonce.h:49:2: note: in expansion of macro 'compiletime_assert_rwonce_type' 49 | compiletime_assert_rwonce_type(x); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/h8300/include/asm/atomic.h:15:25: note: in expansion of macro 'READ_ONCE' 15 | #define atomic_read(v) READ_ONCE((v)->counter) | ^~~~~~~~~ kernel/kthread.c:1306:30: note: in expansion of macro 'atomic_read' 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~~~~~~~~~~ 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~ include/linux/compiler_types.h:300:9: note: in definition of macro '__compiletime_assert' 300 | if (!(condition)) \ | ^~~~~~~~~ include/linux/compiler_types.h:320:2: note: in expansion of macro '_compiletime_assert' 320 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:2: note: in expansion of macro 'compiletime_assert' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:21: note: in expansion of macro '__native_word' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~ include/asm-generic/rwonce.h:49:2: note: in expansion of macro 'compiletime_assert_rwonce_type' 49 | compiletime_assert_rwonce_type(x); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/h8300/include/asm/atomic.h:15:25: note: in expansion of macro 'READ_ONCE' 15 | #define atomic_read(v) READ_ONCE((v)->counter) | ^~~~~~~~~ kernel/kthread.c:1306:30: note: in expansion of macro 'atomic_read' 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~~~~~~~~~~ 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~ include/linux/compiler_types.h:300:9: note: in definition of macro '__compiletime_assert' 300 | if (!(condition)) \ | ^~~~~~~~~ include/linux/compiler_types.h:320:2: note: in expansion of macro '_compiletime_assert' 320 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:2: note: in expansion of macro 'compiletime_assert' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:21: note: in expansion of macro '__native_word' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~ include/asm-generic/rwonce.h:49:2: note: in expansion of macro 'compiletime_assert_rwonce_type' 49 | compiletime_assert_rwonce_type(x); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/h8300/include/asm/atomic.h:15:25: note: in expansion of macro 'READ_ONCE' 15 | #define atomic_read(v) READ_ONCE((v)->counter) | ^~~~~~~~~ kernel/kthread.c:1306:30: note: in expansion of macro 'atomic_read' 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~~~~~~~~~~ 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~ include/linux/compiler_types.h:300:9: note: in definition of macro '__compiletime_assert' 300 | if (!(condition)) \ | ^~~~~~~~~ include/linux/compiler_types.h:320:2: note: in expansion of macro '_compiletime_assert' 320 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:2: note: in expansion of macro 'compiletime_assert' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:49:2: note: in expansion of macro 'compiletime_assert_rwonce_type' 49 | compiletime_assert_rwonce_type(x); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/h8300/include/asm/atomic.h:15:25: note: in expansion of macro 'READ_ONCE' 15 | #define atomic_read(v) READ_ONCE((v)->counter) | ^~~~~~~~~ kernel/kthread.c:1306:30: note: in expansion of macro 'atomic_read' 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~~~~~~~~~~ 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~ include/linux/compiler_types.h:271:13: note: in definition of macro '__unqual_scalar_typeof' 271 | _Generic((x), \ | ^ include/asm-generic/rwonce.h:50:2: note: in expansion of macro '__READ_ONCE' 50 | __READ_ONCE(x); \ | ^~~~~~~~~~~ arch/h8300/include/asm/atomic.h:15:25: note: in expansion of macro 'READ_ONCE' 15 | #define atomic_read(v) READ_ONCE((v)->counter) | ^~~~~~~~~ kernel/kthread.c:1306:30: note: in expansion of macro 'atomic_read' 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~~~~~~~~~~ In file included from ./arch/h8300/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:248, from include/asm-generic/bug.h:5, from arch/h8300/include/asm/bug.h:8, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:9, from kernel/kthread.c:11: 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~ include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' 44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) | ^ arch/h8300/include/asm/atomic.h:15:25: note: in expansion of macro 'READ_ONCE' 15 | #define atomic_read(v) READ_ONCE((v)->counter) | ^~~~~~~~~ kernel/kthread.c:1306:30: note: in expansion of macro 'atomic_read' 1306 | membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); | ^~~~~~~~~~~ cc1: some warnings being treated as errors -- In file included from include/linux/err.h:5, from include/linux/kthread.h:5, from include/trace/events/sched.h:8, from kernel/sched/core.c:10: include/linux/scatterlist.h: In function 'sg_set_buf': include/asm-generic/page.h:89:50: warning: ordered comparison of pointer with null pointer [-Wextra] 89 | #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \ | ^~ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ include/linux/scatterlist.h:137:2: note: in expansion of macro 'BUG_ON' 137 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~ include/linux/scatterlist.h:137:10: note: in expansion of macro 'virt_addr_valid' 137 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~~~~~~~~~~ kernel/sched/core.c: In function 'schedule_tail': kernel/sched/core.c:4235:13: warning: variable 'rq' set but not used [-Wunused-but-set-variable] 4235 | struct rq *rq; | ^~ kernel/sched/core.c: In function 'context_switch': 4295 | membarrier_finish_switch_mm(rq->membarrier_state); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ | membarrier_switch_mm 4295 | membarrier_finish_switch_mm(rq->membarrier_state); | ^~ cc1: some warnings being treated as errors vim +/membarrier_finish_switch_mm +1306 kernel/kthread.c 1282 1283 /** 1284 * kthread_use_mm - make the calling kthread operate on an address space 1285 * @mm: address space to operate on 1286 */ 1287 void kthread_use_mm(struct mm_struct *mm) 1288 { 1289 struct mm_struct *active_mm; 1290 struct task_struct *tsk = current; 1291 1292 WARN_ON_ONCE(!(tsk->flags & PF_KTHREAD)); 1293 WARN_ON_ONCE(tsk->mm); 1294 1295 task_lock(tsk); 1296 /* Hold off tlb flush IPIs while switching mm's */ 1297 local_irq_disable(); 1298 active_mm = tsk->active_mm; 1299 if (active_mm != mm) { 1300 mmgrab(mm); 1301 tsk->active_mm = mm; 1302 } 1303 tsk->mm = mm; 1304 membarrier_update_current_mm(mm); 1305 switch_mm_irqs_off(active_mm, mm, tsk); 1307 local_irq_enable(); 1308 task_unlock(tsk); 1309 #ifdef finish_arch_post_lock_switch 1310 finish_arch_post_lock_switch(); 1311 #endif 1312 1313 if (active_mm != mm) 1314 mmdrop(active_mm); 1315 1316 to_kthread(tsk)->oldfs = force_uaccess_begin(); 1317 } 1318 EXPORT_SYMBOL_GPL(kthread_use_mm); 1319 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org