Hi Michal, [auto build test WARNING on next-20160229] [also build test WARNING on v4.5-rc6] [cannot apply to drm/drm-next drm-intel/for-linux-next v4.5-rc6 v4.5-rc5 v4.5-rc4] [if your patch is applied to the wrong git tree, please drop us a note to help improving the system] url: https://github.com/0day-ci/linux/commits/Michal-Hocko/change-mmap_sem-taken-for-write-killable/20160229-213258 config: i386-randconfig-x003-201609 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): In file included from include/asm-generic/bug.h:4:0, from arch/x86/include/asm/bug.h:35, from include/linux/bug.h:4, from include/linux/mmdebug.h:4, from include/linux/mm.h:8, from fs/proc/task_mmu.c:1: fs/proc/task_mmu.c: In function 'clear_refs_write': fs/proc/task_mmu.c:1030:8: error: implicit declaration of function 'down_write_killable' [-Werror=implicit-function-declaration] if (down_write_killable(&mm->mmap_sem)) { ^ include/linux/compiler.h:151:30: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^ >> fs/proc/task_mmu.c:1030:4: note: in expansion of macro 'if' if (down_write_killable(&mm->mmap_sem)) { ^ cc1: some warnings being treated as errors vim +/if +1030 fs/proc/task_mmu.c 1014 task = get_proc_task(file_inode(file)); 1015 if (!task) 1016 return -ESRCH; 1017 mm = get_task_mm(task); 1018 if (mm) { 1019 struct clear_refs_private cp = { 1020 .type = type, 1021 }; 1022 struct mm_walk clear_refs_walk = { 1023 .pmd_entry = clear_refs_pte_range, 1024 .test_walk = clear_refs_test_walk, 1025 .mm = mm, 1026 .private = &cp, 1027 }; 1028 1029 if (type == CLEAR_REFS_MM_HIWATER_RSS) { > 1030 if (down_write_killable(&mm->mmap_sem)) { 1031 put_task_struct(task); 1032 return -EINTR; 1033 } 1034 1035 /* 1036 * Writing 5 to /proc/pid/clear_refs resets the peak 1037 * resident set size to this mm's current rss value. 1038 */ --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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