Hi Zi, [auto build test WARNING on mmotm/master] [also build test WARNING on v4.12-rc2 next-20170525] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Zi-Yan/mm-page-migration-enhancement-for-thp/20170526-003749 base: git://git.cmpxchg.org/linux-mmotm.git master config: i386-randconfig-x017-201721 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): In file included from arch/x86/mm/gup.c:12:0: include/linux/swapops.h: In function 'swp_entry_to_pmd': >> include/linux/swapops.h:222:2: warning: braces around scalar initializer return (pmd_t){{ 0 }}; ^~~~~~ include/linux/swapops.h:222:2: note: (near initialization for '(anonymous).pmd') vim +222 include/linux/swapops.h 2182e56bf Zi Yan 2017-05-25 206 struct page *new) 2182e56bf Zi Yan 2017-05-25 207 { 2182e56bf Zi Yan 2017-05-25 208 BUILD_BUG(); 2182e56bf Zi Yan 2017-05-25 209 } 2182e56bf Zi Yan 2017-05-25 210 2182e56bf Zi Yan 2017-05-25 211 static inline void pmd_migration_entry_wait(struct mm_struct *m, pmd_t *p) { } 2182e56bf Zi Yan 2017-05-25 212 2182e56bf Zi Yan 2017-05-25 213 static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd) 2182e56bf Zi Yan 2017-05-25 214 { 2182e56bf Zi Yan 2017-05-25 215 BUILD_BUG(); 2182e56bf Zi Yan 2017-05-25 216 return swp_entry(0, 0); 2182e56bf Zi Yan 2017-05-25 217 } 2182e56bf Zi Yan 2017-05-25 218 2182e56bf Zi Yan 2017-05-25 219 static inline pmd_t swp_entry_to_pmd(swp_entry_t entry) 2182e56bf Zi Yan 2017-05-25 220 { 2182e56bf Zi Yan 2017-05-25 221 BUILD_BUG(); 2182e56bf Zi Yan 2017-05-25 @222 return (pmd_t){{ 0 }}; 2182e56bf Zi Yan 2017-05-25 223 } 2182e56bf Zi Yan 2017-05-25 224 2182e56bf Zi Yan 2017-05-25 225 static inline int is_pmd_migration_entry(pmd_t pmd) 2182e56bf Zi Yan 2017-05-25 226 { 2182e56bf Zi Yan 2017-05-25 227 return 0; 2182e56bf Zi Yan 2017-05-25 228 } 2182e56bf Zi Yan 2017-05-25 229 #endif 2182e56bf Zi Yan 2017-05-25 230 :::::: The code at line 222 was first introduced by commit :::::: 2182e56bfe80b55d1a9a8e8de04e6a5578b1dce0 mm: thp: enable thp migration in generic path :::::: TO: Zi Yan <zi.yan@xxxxxxxxxxxxxx> :::::: CC: 0day robot <fengguang.wu@xxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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