On Sat, Aug 14, 2021 at 07:16:24AM +0800, kernel test robot wrote: > 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-between-offset_il_node-and-mpol_rebind_task/20210814-004451 > base: 36a21d51725af2ce0700c6ebcb6b9594aac658a6 > config: x86_64-randconfig-a003-20210813 (attached as .config) > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 62df4df41c939205b2dc0a2a3bfb75b8c1ed74fa) > 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/99d8d888eb92ea46a5f4883773f3edaee5ccd28e > 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=clang make.cross O=build_dir ARCH=x86_64 SHELL=/bin/bash > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > All errors (new ones prefixed by >>): > > >> ld.lld: error: undefined symbol: __compiletime_assert_467 > >>> referenced by mempolicy.c:1968 (mm/mempolicy.c:1968) > >>> mempolicy.o:(offset_il_node) in archive mm/built-in.a Grabbing Nick's patch [1] to support the error function attribute in clang and the kernel side patch [2] turns this into: mm/mempolicy.c:1968:24: error: call to '__compiletime_assert_467' declared with 'error' attribute: Unsupported access size for {READ,WRITE}_ONCE(). nodemask_t nodemask = READ_ONCE(pol->nodes); ^ ./include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE' compiletime_assert_rwonce_type(x); \ ^ ./include/asm-generic/rwonce.h:36:2: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ ./include/linux/compiler_types.h:322:2: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ ./include/linux/compiler_types.h:310:2: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^ ./include/linux/compiler_types.h:303:4: note: expanded from macro '__compiletime_assert' prefix ## suffix(); \ ^ <scratch space>:246:1: note: expanded from here __compiletime_assert_467 ^ mm/mempolicy.c:214:2: error: call to '__compiletime_assert_448' declared with 'error' attribute: Unsupported access size for {READ,WRITE}_ONCE(). WRITE_ONCE(pol->nodes, *nodes); ^ ./include/asm-generic/rwonce.h:60:2: note: expanded from macro 'WRITE_ONCE' compiletime_assert_rwonce_type(x); \ ^ ./include/asm-generic/rwonce.h:36:2: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ ./include/linux/compiler_types.h:322:2: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ ./include/linux/compiler_types.h:310:2: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^ ./include/linux/compiler_types.h:303:4: note: expanded from macro '__compiletime_assert' prefix ## suffix(); \ ^ <scratch space>:16:1: note: expanded from here __compiletime_assert_448 ^ mm/mempolicy.c:337:2: error: call to '__compiletime_assert_452' declared with 'error' attribute: Unsupported access size for {READ,WRITE}_ONCE(). WRITE_ONCE(pol->nodes, tmp); ^ ./include/asm-generic/rwonce.h:60:2: note: expanded from macro 'WRITE_ONCE' compiletime_assert_rwonce_type(x); \ ^ ./include/asm-generic/rwonce.h:36:2: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ ./include/linux/compiler_types.h:322:2: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ ./include/linux/compiler_types.h:310:2: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^ ./include/linux/compiler_types.h:303:4: note: expanded from macro '__compiletime_assert' prefix ## suffix(); \ ^ <scratch space>:38:1: note: expanded from here __compiletime_assert_452 ^ mm/mempolicy.c:196:2: error: call to '__compiletime_assert_447' declared with 'error' attribute: Unsupported access size for {READ,WRITE}_ONCE(). WRITE_ONCE(pol->nodes, *nodes); ^ ./include/asm-generic/rwonce.h:60:2: note: expanded from macro 'WRITE_ONCE' compiletime_assert_rwonce_type(x); \ ^ ./include/asm-generic/rwonce.h:36:2: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ ./include/linux/compiler_types.h:322:2: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ ./include/linux/compiler_types.h:310:2: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^ ./include/linux/compiler_types.h:303:4: note: expanded from macro '__compiletime_assert' prefix ## suffix(); \ ^ <scratch space>:13:1: note: expanded from here __compiletime_assert_447 ^ 4 errors generated. Which appears to be what Matthew mentioned, as this config has CONFIG_NODES_SHIFT=10 so nodemask_t is 128 bytes large. [1]: https://reviews.llvm.org/D106030 [2]: https://lore.kernel.org/r/20210802202326.1817503-1-ndesaulniers@xxxxxxxxxx/ Cheers, Nathan
