Hi Waiman, I love your patch! Perhaps something to improve: [auto build test WARNING on dennis-percpu/for-next] [also build test WARNING on linus/master v5.12-rc7 next-20210413] [cannot apply to hnaz-linux-mm/master] [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/Waiman-Long/mm-memcg-Reduce-kmem... base: https://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu.git for-next config: mips-randconfig-r031-20210413 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9829f5e6b1bca9b61efc629770d28bb9014dec45) 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 mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://github.com/0day-ci/linux/commit/565fa80b02eeb06c48a88ac6354a4fc9e... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Waiman-Long/mm-memcg-Reduce-kmemcache-memory-accounting-overhead/20210413-065659 git checkout 565fa80b02eeb06c48a88ac6354a4fc9e5addd06 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from mm/mempool.c:22: static void mod_obj_stock_state(struct obj_cgroup *objcg, ^ 1 warning generated. -- In file included from mm/oom_kill.c:49: static void mod_obj_stock_state(struct obj_cgroup ^ fatal error: error in backend: Nested variants found in inline asm string: ' .set push .set mips64r2 .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/bitops.h", .line = 105, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif 1: ll $0, $1 or $0, $2 sc $0, $1 beqz $0, 1b .set pop ' clang-13: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 13.0.0 (git://gitmirror/llvm_project 9829f5e6b1bca9b61efc629770d28bb9014dec45) Target: mipsel-unknown-linux-gnu Thread model: posix InstalledDir: /opt/cross/clang-9829f5e6b1/bin clang-13: note: diagnostic msg: Makefile arch block certs crypto drivers fs include init ipc kernel lib mm scripts security sound source usr virt -- In file included from mm/slab_common.c:33: static void mod_obj_stock_state(struct obj_cgroup ^ fatal error: error in backend: Nested variants found in inline asm string: ' .set push .set mips64r2 .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/atomic.h", .line = 153, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif 1: ll $0, $1 # atomic_add addu $0, $2 sc $0, $1 beqz $0, 1b .set pop ' clang-13: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 13.0.0 (git://gitmirror/llvm_project 9829f5e6b1bca9b61efc629770d28bb9014dec45) Target: mipsel-unknown-linux-gnu Thread model: posix InstalledDir: /opt/cross/clang-9829f5e6b1/bin clang-13: note: diagnostic msg: Makefile arch block certs crypto drivers fs include init ipc kernel lib mm scripts security sound source usr virt -- In file included from mm/slub.c:20: static void mod_obj_stock_state(struct obj_cgroup ^ mm/slub.c:1503:29: warning: unused function 'node_nr_slabs' static inline unsigned long node_nr_slabs(struct kmem_cache_node ^ mm/slub.c:1521:21: warning: unused function 'kmalloc_large_node_hook' static inline void size_t size, gfp_t flags) ^ fatal error: error in backend: Nested variants found in inline asm string: ' .set push .set mips64r2 .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/bitops.h", .line = 192, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif 1: ll $0, $2 or $1, $0, $3 sc $1, $2 beqz $1, 1b .set pop ' clang-13: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 13.0.0 (git://gitmirror/llvm_project 9829f5e6b1bca9b61efc629770d28bb9014dec45) Target: mipsel-unknown-linux-gnu Thread model: posix InstalledDir: /opt/cross/clang-9829f5e6b1/bin clang-13: note: diagnostic msg: Makefile arch block certs crypto drivers fs include init ipc kernel lib mm scripts security sound source usr virt vim +/mod_obj_stock_state +401 mm/slab.h 400 402 struct pglist_data *pgdat, int idx, int nr) 403 { 404 } 405 #endif /* CONFIG_MEMCG_KMEM */ 406 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org