Hi Peter, [auto build test ERROR on linus/master] [also build test ERROR on v4.8-rc5 next-20160825] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] [Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on] [Check https://git-scm.com/docs/git-format-patch for more information]
url: https://github.com/0day-ci/linux/commits/Peter-Zijlstra/Question-on-smp_mb__before_spinlock/20160905-174026 config: x86_64-randconfig-x013-201636 (attached as .config) compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All errors (new ones prefixed by >>): In file included from include/linux/sched.h:27:0, from include/linux/kasan.h:4, from include/linux/slab.h:118, from include/linux/crypto.h:24, from arch/x86/kernel/asm-offsets.c:8: include/linux/mm_types.h: In function 'set_tlb_flush_pending': >> include/linux/mm_types.h:557:2: error: implicit declaration of function >> 'smp_mb__before_spinlock' [-Werror=implicit-function-declaration] smp_mb__before_spinlock(); ^~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors make[2]: *** [arch/x86/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [sub-make] Error 2 vim +/smp_mb__before_spinlock +557 include/linux/mm_types.h 20841405 Rik van Riel 2013-12-18 551 mm->tlb_flush_pending = true; af2c1401 Mel Gorman 2013-12-18 552 af2c1401 Mel Gorman 2013-12-18 553 /* af2c1401 Mel Gorman 2013-12-18 554 * Guarantee that the tlb_flush_pending store does not leak into the af2c1401 Mel Gorman 2013-12-18 555 * critical section updating the page tables af2c1401 Mel Gorman 2013-12-18 556 */ af2c1401 Mel Gorman 2013-12-18 @557 smp_mb__before_spinlock(); 20841405 Rik van Riel 2013-12-18 558 } 20841405 Rik van Riel 2013-12-18 559 /* Clearing is done after a TLB flush, which also provides a barrier. */ 20841405 Rik van Riel 2013-12-18 560 static inline void clear_tlb_flush_pending(struct mm_struct *mm) :::::: The code at line 557 was first introduced by commit :::::: af2c1401e6f9177483be4fad876d0073669df9df mm: numa: guarantee that tlb_flush_pending updates are visible before page table updates :::::: TO: Mel Gorman <mgor...@suse.de> :::::: CC: Linus Torvalds <torva...@linux-foundation.org> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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