tree: https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/membarrier head: 07a8b963002cb955b7516e61bad19514a3acaa82 commit: f184d013a255a523116b692db4996c5db2569e86 [4/8] membarrier: Make the post-switch-mm barrier explicit config: arm-randconfig-r032-20210615 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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 # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # 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/membarrier git checkout f184d013a255a523116b692db4996c5db2569e86 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 >>): compiletime_assert_rwonce_type(x); \ ^ include/asm-generic/rwonce.h:36:35: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/compiler_types.h:328:22: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~ include/linux/compiler_types.h:316:23: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~ include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert' if (!(condition)) \ ^~~~~~~~~ kernel/kthread.c:1328:47: error: no member named 'membarrier_state' in 'struct mm_struct' membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); ~~ ^ arch/arm/include/asm/atomic.h:25:35: note: expanded from macro 'atomic_read' #define atomic_read(v) READ_ONCE((v)->counter) ^ include/asm-generic/rwonce.h:49:33: note: expanded from macro 'READ_ONCE' compiletime_assert_rwonce_type(x); \ ^ include/asm-generic/rwonce.h:36:35: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/compiler_types.h:328:22: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~ include/linux/compiler_types.h:316:23: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~ include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert' if (!(condition)) \ ^~~~~~~~~ kernel/kthread.c:1328:47: error: no member named 'membarrier_state' in 'struct mm_struct' membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); ~~ ^ arch/arm/include/asm/atomic.h:25:35: note: expanded from macro 'atomic_read' #define atomic_read(v) READ_ONCE((v)->counter) ^ include/asm-generic/rwonce.h:49:33: note: expanded from macro 'READ_ONCE' compiletime_assert_rwonce_type(x); \ ^ include/asm-generic/rwonce.h:36:48: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ include/linux/compiler_types.h:328:22: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~ include/linux/compiler_types.h:316:23: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~ include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert' if (!(condition)) \ ^~~~~~~~~ kernel/kthread.c:1328:47: error: no member named 'membarrier_state' in 'struct mm_struct' membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); ~~ ^ arch/arm/include/asm/atomic.h:25:35: note: expanded from macro 'atomic_read' #define atomic_read(v) READ_ONCE((v)->counter) ^ include/asm-generic/rwonce.h:50:14: note: expanded from macro 'READ_ONCE' __READ_ONCE(x); \ ^ include/asm-generic/rwonce.h:44:65: note: expanded from macro '__READ_ONCE' #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) ^ include/linux/compiler_types.h:279:13: note: expanded from macro '__unqual_scalar_typeof' _Generic((x), \ ^ kernel/kthread.c:1328:47: error: no member named 'membarrier_state' in 'struct mm_struct' membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); ~~ ^ arch/arm/include/asm/atomic.h:25:35: note: expanded from macro 'atomic_read' #define atomic_read(v) READ_ONCE((v)->counter) ^ include/asm-generic/rwonce.h:50:14: note: expanded from macro 'READ_ONCE' __READ_ONCE(x); \ ^ include/asm-generic/rwonce.h:44:65: note: expanded from macro '__READ_ONCE' #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) ^ include/linux/compiler_types.h:286:15: note: expanded from macro '__unqual_scalar_typeof' default: (x))) ^ kernel/kthread.c:1328:47: error: no member named 'membarrier_state' in 'struct mm_struct' membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); ~~ ^ arch/arm/include/asm/atomic.h:25:35: note: expanded from macro 'atomic_read' #define atomic_read(v) READ_ONCE((v)->counter) ^ include/asm-generic/rwonce.h:50:14: note: expanded from macro 'READ_ONCE' __READ_ONCE(x); \ ^ include/asm-generic/rwonce.h:44:72: note: expanded from macro '__READ_ONCE' #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) ^ membarrier_finish_switch_mm(atomic_read(&mm->membarrier_state)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/arm/include/asm/atomic.h:25:24: note: expanded from macro 'atomic_read' #define atomic_read(v) READ_ONCE((v)->counter) ^~~~~~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:47:28: note: expanded from macro 'READ_ONCE' #define READ_ONCE(x) \ ^ 10 errors generated. vim +/void +1328 kernel/kthread.c 1304 1305 /** 1306 * kthread_use_mm - make the calling kthread operate on an address space 1307 * @mm: address space to operate on 1308 */ 1309 void kthread_use_mm(struct mm_struct *mm) 1310 { 1311 struct mm_struct *active_mm; 1312 struct task_struct *tsk = current; 1313 1314 WARN_ON_ONCE(!(tsk->flags & PF_KTHREAD)); 1315 WARN_ON_ONCE(tsk->mm); 1316 1317 task_lock(tsk); 1318 /* Hold off tlb flush IPIs while switching mm's */ 1319 local_irq_disable(); 1320 active_mm = tsk->active_mm; 1321 if (active_mm != mm) { 1322 mmgrab(mm); 1323 tsk->active_mm = mm; 1324 } 1325 tsk->mm = mm; 1326 membarrier_update_current_mm(mm); 1327 switch_mm_irqs_off(active_mm, mm, tsk); 1329 local_irq_enable(); 1330 task_unlock(tsk); 1331 #ifdef finish_arch_post_lock_switch 1332 finish_arch_post_lock_switch(); 1333 #endif 1334 1335 if (active_mm != mm) 1336 mmdrop(active_mm); 1337 1338 to_kthread(tsk)->oldfs = force_uaccess_begin(); 1339 } 1340 EXPORT_SYMBOL_GPL(kthread_use_mm); 1341 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org