Hi yanghui, Thank you for the patch! Yet something to improve: [auto build test ERROR on v5.14-rc5] [cannot apply to hnaz-linux-mm/master next-20210813] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/yanghui/mm-mempolicy-fix-a-race-... base: 36a21d51725af2ce0700c6ebcb6b9594aac658a6 config: ia64-randconfig-c024-20210813 (attached as .config) compiler: ia64-linux-gcc (GCC) 11.2.0 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://github.com/0day-ci/linux/commit/99d8d888eb92ea46a5f4883773f3edaee... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review yanghui/mm-mempolicy-fix-a-race-between-offset_il_node-and-mpol_rebind_task/20210814-004451 git checkout 99d8d888eb92ea46a5f4883773f3edaee5ccd28e # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=ia64 SHELL=/bin/bash 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 >>): In file included from arch/ia64/include/asm/pgtable.h:153, from include/linux/pgtable.h:6, from arch/ia64/include/asm/uaccess.h:40, from include/linux/uaccess.h:11, from include/linux/sched/task.h:11, from include/linux/sched/signal.h:9, from include/linux/rcuwait.h:6, from include/linux/percpu-rwsem.h:7, from include/linux/fs.h:33, from include/linux/dax.h:5, from include/linux/mempolicy.h:11, from mm/mempolicy.c:70: arch/ia64/include/asm/mmu_context.h: In function 'reload_context': arch/ia64/include/asm/mmu_context.h:127:48: warning: variable 'old_rr4' set but not used [-Wunused-but-set-variable] 127 | unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4; | ^~~~~~~ In file included from <command-line>: mm/mempolicy.c: In function 'mpol_new_interleave': 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler_types.h:309:25: note: in definition of macro '__compiletime_assert' 309 | prefix ## suffix(); \ | ^~~~~~ include/linux/compiler_types.h:328:9: note: in expansion of macro '_compiletime_assert' 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:60:9: note: in expansion of macro 'compiletime_assert_rwonce_type' 60 | compiletime_assert_rwonce_type(x); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/mempolicy.c:196:9: note: in expansion of macro 'WRITE_ONCE' 196 | WRITE_ONCE(pol->nodes, *nodes); | ^~~~~~~~~~ mm/mempolicy.c: In function 'mpol_new_bind': include/linux/compiler_types.h:328:45: error: call to '__compiletime_assert_320' declared with attribute error: Unsupported access size for {READ,WRITE}_ONCE(). 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler_types.h:309:25: note: in definition of macro '__compiletime_assert' 309 | prefix ## suffix(); \ | ^~~~~~ include/linux/compiler_types.h:328:9: note: in expansion of macro '_compiletime_assert' 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:60:9: note: in expansion of macro 'compiletime_assert_rwonce_type' 60 | compiletime_assert_rwonce_type(x); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/mempolicy.c:214:9: note: in expansion of macro 'WRITE_ONCE' 214 | WRITE_ONCE(pol->nodes, *nodes); | ^~~~~~~~~~ mm/mempolicy.c: In function 'offset_il_node': include/linux/compiler_types.h:328:45: error: call to '__compiletime_assert_326' declared with attribute error: Unsupported access size for {READ,WRITE}_ONCE(). 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler_types.h:309:25: note: in definition of macro '__compiletime_assert' 309 | prefix ## suffix(); \ | ^~~~~~ include/linux/compiler_types.h:328:9: note: in expansion of macro '_compiletime_assert' 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type' 49 | compiletime_assert_rwonce_type(x); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/mempolicy.c:1968:31: note: in expansion of macro 'READ_ONCE' 1968 | nodemask_t nodemask = READ_ONCE(pol->nodes); | ^~~~~~~~~ mm/mempolicy.c: In function 'mpol_rebind_nodemask': include/linux/compiler_types.h:328:45: error: call to '__compiletime_assert_321' declared with attribute error: Unsupported access size for {READ,WRITE}_ONCE(). 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler_types.h:309:25: note: in definition of macro '__compiletime_assert' 309 | prefix ## suffix(); \ | ^~~~~~ include/linux/compiler_types.h:328:9: note: in expansion of macro '_compiletime_assert' 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert' 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | ^~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:60:9: note: in expansion of macro 'compiletime_assert_rwonce_type' 60 | compiletime_assert_rwonce_type(x); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/mempolicy.c:337:9: note: in expansion of macro 'WRITE_ONCE' 337 | WRITE_ONCE(pol->nodes, tmp); | ^~~~~~~~~~ vim +/__compiletime_assert_319 +328 include/linux/compiler_types.h eb5c2d4b45e3d2d Will Deacon 2020-07-21 314 eb5c2d4b45e3d2d Will Deacon 2020-07-21 315 #define _compiletime_assert(condition, msg, prefix, suffix) \ eb5c2d4b45e3d2d Will Deacon 2020-07-21 316 __compiletime_assert(condition, msg, prefix, suffix) eb5c2d4b45e3d2d Will Deacon 2020-07-21 317 eb5c2d4b45e3d2d Will Deacon 2020-07-21 318 /** eb5c2d4b45e3d2d Will Deacon 2020-07-21 319 * compiletime_assert - break build and emit msg if condition is false eb5c2d4b45e3d2d Will Deacon 2020-07-21 320 * @condition: a compile-time constant condition to check eb5c2d4b45e3d2d Will Deacon 2020-07-21 321 * @msg: a message to emit if condition is false eb5c2d4b45e3d2d Will Deacon 2020-07-21 322 * eb5c2d4b45e3d2d Will Deacon 2020-07-21 323 * In tradition of POSIX assert, this macro will break the build if the eb5c2d4b45e3d2d Will Deacon 2020-07-21 324 * supplied condition is *false*, emitting the supplied error message if the eb5c2d4b45e3d2d Will Deacon 2020-07-21 325 * compiler has support to do so. eb5c2d4b45e3d2d Will Deacon 2020-07-21 326 */ eb5c2d4b45e3d2d Will Deacon 2020-07-21 327 #define compiletime_assert(condition, msg) \ eb5c2d4b45e3d2d Will Deacon 2020-07-21 @328 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) eb5c2d4b45e3d2d Will Deacon 2020-07-21 329 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org