Re: [PATCH] mm: remove the redundancy code

[kernel test robot <lkp@intel.com>]

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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@intel.com>

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(a)lists.01.org

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