Hi Su, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on mmotm/master] url: https://github.com/0day-ci/linux/commits/Su-Hui/mm-remove-the-redundancy-code/20200630-013137 base: git://git.cmpxchg.org/linux-mmotm.git master config: x86_64-allnoconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project cf1d04484344be52ada8178e41d18fd15a9b880c) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): ^ case 1: ^include/linux/signal.h :133:2: note: expanded from macro '_SIG_SET_BINOP' case 2: ^ include/linux/signal.h:147:1: warning: unannotated fall-through between switch labels include/linux/signal.h:137:2: note: expanded from macro '_SIG_SET_BINOP' case 1: ^ include/linux/signal.h:177:1: warning: unannotated fall-through between switch labels _SIG_SET_OP(signotset, _sig_not) ^ include/linux/signal.h:167:2: note: expanded from macro '_SIG_SET_OP' case 2: = ^ include/linux/signal.h:177:1: warning: unannotated fall-through between switch labels include/linux/signal.h:169:2: note: expanded from macro '_SIG_SET_OP' case 1: = ^ >> include/linux/signal.h:150:1: warning: include/linux/signal.h:unannotated fall-through between switch labels warning: unannotated fall-through between switch labels case 1: = 0; -- ^ __attribute__((fallthrough)); include/linux/signal.h:203:2: note: insert 'break;' to avoid fall-through case 1: = -1; ^ break; include/linux/signal.h:233:2: warning: unannotated fall-through between switch labels case 1: ; ^ kernel//irq/handle.c:170:3: warning: unannotated fall-through between switch labels case IRQ_HANDLED: ^ 3kernel//irq/handle.cinclude/linux/signal.h:233:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: ; ^ __attribute__((fallthrough)); include/linux/signal.h:233:2: note: insert 'break;' to avoid fall-through case 1: ; ^ break; include/linux/signal.h:245:2: warning: unannotated fall-through between switch labels case 1: ; ^ :170:3: note: insert '__attribute__((fallthrough));' to silence this warning case IRQ_HANDLED: ^ __attribute__((fallthrough)); kernel//irq/handle.c:170:3: note: insert 'break;' to avoid fall-through case IRQ_HANDLED: ^ break; include/linux/signal.h:245:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: ; ^ __attribute__((fallthrough)); include/linux/signal.h:245:2: note: insert 'break;' to avoid fall-through case 1: ; ^ break; warnings generated. In file included from kernel//events/core.c:24: In file included from include/linux/ptrace.h:7: In file included from include/linux/sched/signal.h:6: include/linux/signal.h:147:1: warning: unannotated fall-through between switch labels _SIG_SET_BINOP(sigorsets, _sig_or) ^ include/linux/signal.h:133:2: note: expanded from macro '_SIG_SET_BINOP' case 2: ^ include/linux/signal.h:147:1: warning: unannotated fall-through between switch labels include/linux/signal.h:137:2: note: expanded from macro '_SIG_SET_BINOP' case 1: ^ include/linux/signal.h:150:1: warning: unannotated fall-through between switch labels _SIG_SET_BINOP(sigandsets, _sig_and) ^ include/linux/signal.h:133:2: note: expanded from macro '_SIG_SET_BINOP' case 2: ^ include/linux/signal.h:150:1: warning: unannotated fall-through between switch labels include/linux/signal.h:137:2: note: expanded from macro '_SIG_SET_BINOP' case 1: ^ include/linux/signal.h:153:1: warning: unannotated fall-through between switch labels _SIG_SET_BINOP(sigandnsets, _sig_andn) ^ include/linux/signal.h:133:2: note: expanded from macro '_SIG_SET_BINOP' case 2: ^ include/linux/signal.h:153:1: warning: unannotated fall-through between switch labels include/linux/signal.h:137:2: note: expanded from macro '_SIG_SET_BINOP' case 1: ^ include/linux/signal.h:177:1: warning: unannotated fall-through between switch labels _SIG_SET_OP(signotset, _sig_not) ^ include/linux/signal.h:167:2: note: expanded from macro '_SIG_SET_OP' case 2: = ^ include/linux/signal.h:177:1: warning: unannotated fall-through between switch labels include/linux/signal.h:169:2: note: expanded from macro '_SIG_SET_OP' case 1: = ^ include/linux/signal.h:190:2: warning: unannotated fall-through between switch labels case 1: = 0; ^ include/linux/signal.h:190:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: = 0; ^ __attribute__((fallthrough)); include/linux/signal.h:190:2: note: insert 'break;' to avoid fall-through case 1: = 0; ^ break; include/linux/signal.h:203:2: warning: unannotated fall-through between switch labels case 1: = -1; ^ In file included from kernel//locking/semaphore.c:34: In file included from include/linux/ftrace.h:11: In file included from include/linux/kallsyms.h:12: include/linux/mm.h:162:2: warning: unannotated fall-through between switch labels case 72: ^ In file included from kernel//time/time.c:33: In file included from include/linux/syscalls.h:85: In file included from include/trace/syscall.h:7: In file included from include/linux/trace_events.h:6: In file included from include/linux/ring_buffer.h:5: >> include/linux/mm.h:162:2: warning: include/linux/signal.hunannotated fall-through between switch labels : case 72:203 ^: 2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: = -1; ^ __attribute__((fallthrough)); include/linux/signal.h:203:2: note: insert 'break;' to avoid fall-through case 1: = -1; ^ break; include/linux/signal.h:233:2: warning: unannotated fall-through between switch labels case 1: ; ^ include/linux/signal.hinclude/linux/mm.h:162:2: note: insert '__attribute__((fallthrough));' to silence this warning case 72: ^ __attribute__((fallthrough)); include/linux/mm.h:162:2: note: insert 'break;' to avoid fall-through case 72: ^ break; include/linux/mm.h:164:2: warning: unannotated fall-through between switch labels case 64: ^ include/linux/mm.h:164:2: note: insert '__attribute__((fallthrough));' to silence this warning case 64: ^ __attribute__((fallthrough)); include/linux/mm.h:164:2: note: insert 'break;' to avoid fall-through case 64: ^ break; include/linux/mm.h:166:2: warning: unannotated fall-through between switch labels case 56: ^ :233:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: ; ^ __attribute__((fallthrough)); include/linux/signal.h:233:2: note: insert 'break;' to avoid fall-through case 1: ; ^ break; include/linux/signal.h:245:2: warning: unannotated fall-through between switch labels case 1: ; ^ include/linux/mm.h:166:2: note: insert '__attribute__((fallthrough));' to silence this warning case 56: ^ __attribute__((fallthrough)); include/linux/mm.h:166:2: note: insert 'break;' to avoid fall-through case 56: ^ break; include/linux/mm.h:162:2: note: insert '__attribute__((fallthrough));' to silence this warning case 72: ^ __attribute__((fallthrough)); include/linux/mm.h:162:2: note: insert 'break;' to avoid fall-through case 72: ^ break; include/linux/mm.h:164:2: warning: unannotated fall-through between switch labels case 64: ^ 12 warnings generated. include/linux/signal.h:245:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: ; ^ __attribute__((fallthrough)); include/linux/signal.h:245:2: note: insert 'break;' to avoid fall-through case 1: ; ^ break; 1 warning generated. include/linux/mm.h:164:2: note: insert '__attribute__((fallthrough));' to silence this warning case 64: ^ __attribute__((fallthrough)); include/linux/mm.h:164:2: note: insert 'break;' to avoid fall-through case 64: ^ break; include/linux/mm.h:166:2: warning: unannotated fall-through between switch labels case 56: ^ In file included from kernel//sched/loadavg.c:9: In file included from kernel//sched/sched.h:11: In file included from include/linux/sched/cputime.h:5: In file included from include/linux/sched/signal.h:6: include/linux/signal.h:147:1: warning: unannotated fall-through between switch labels _SIG_SET_BINOP(sigorsets, _sig_or) ^ include/linux/signal.h:133:2: note: expanded from macro '_SIG_SET_BINOP' case 2: ^ include/linux/signal.h:147:1: warning: unannotated fall-through between switch labels include/linux/signal.h:137:2: note: expanded from macro '_SIG_SET_BINOP' case 1: ^ include/linux/signal.h:150:1: warning: unannotated fall-through between switch labels _SIG_SET_BINOP(sigandsets, _sig_and) vim +150 include/linux/signal.h ^1da177e4c3f41 Linus Torvalds 2005-04-16 148 ^1da177e4c3f41 Linus Torvalds 2005-04-16 149 #define _sig_and(x,y) ((x) & (y)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 @150 _SIG_SET_BINOP(sigandsets, _sig_and) ^1da177e4c3f41 Linus Torvalds 2005-04-16 151 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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