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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , David Rientjes , Shakeel Butt , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-rt-devel@lists.linux.dev Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, pbonzini@redhat.com, skhan@linuxfoundation.org, me@brighamcampbell.com, syzbot+c3178b6b512446632bac@syzkaller.appspotmail.com, "shaikh.kamal" Subject: Re: [PATCH v2 1/1] mm/mmu_notifier: Add async OOM cleanup via call_srcu() Message-ID: <202605031115.qmkkOLQc-lkp@intel.com> References: <20260429222548.25475-1-shaikhkamal2012@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260429222548.25475-1-shaikhkamal2012@gmail.com> X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 5AA68C0002 X-Stat-Signature: 59ddiuktxmb1pmhtceej4jyq1puwkn7u X-HE-Tag: 1777778826-93621 X-HE-Meta: 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 gfVYZx5h 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi shaikh.kamal, kernel test robot noticed the following build errors: [auto build test ERROR on v7.0] [cannot apply to akpm-mm/mm-everything kvm/queue kvm/next kvm/linux-next v7.1-rc1 linus/master next-20260430] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/shaikh-kamal/mm-mmu_notifier-Add-async-OOM-cleanup-via-call_srcu/20260430-202943 base: v7.0 patch link: https://lore.kernel.org/r/20260429222548.25475-1-shaikhkamal2012%40gmail.com patch subject: [PATCH v2 1/1] mm/mmu_notifier: Add async OOM cleanup via call_srcu() config: hexagon-allnoconfig (https://download.01.org/0day-ci/archive/20260503/202605031115.qmkkOLQc-lkp@intel.com/config) compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260503/202605031115.qmkkOLQc-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202605031115.qmkkOLQc-lkp@intel.com/ All errors (new ones prefixed by >>): >> mm/oom_kill.c:523:2: error: call to undeclared function 'mmu_notifier_oom_enter'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 523 | mmu_notifier_oom_enter(mm); | ^ mm/oom_kill.c:523:2: note: did you mean 'mmu_notifier_release'? include/linux/mmu_notifier.h:610:20: note: 'mmu_notifier_release' declared here 610 | static inline void mmu_notifier_release(struct mm_struct *mm) | ^ mm/oom_kill.c:511:28: warning: variable 'oom_reaper_th' set but not used [-Wunused-but-set-global] 511 | static struct task_struct *oom_reaper_th; | ^ 1 warning and 1 error generated. vim +/mmu_notifier_oom_enter +523 mm/oom_kill.c 515 516 static bool __oom_reap_task_mm(struct mm_struct *mm) 517 { 518 struct vm_area_struct *vma; 519 bool ret = true; 520 MA_STATE(mas, &mm->mm_mt, ULONG_MAX, ULONG_MAX); 521 522 /* Notify MMU notifiers about the OOM event */ > 523 mmu_notifier_oom_enter(mm); 524 525 /* 526 * Tell all users of get_user/copy_from_user etc... that the content 527 * is no longer stable. No barriers really needed because unmapping 528 * should imply barriers already and the reader would hit a page fault 529 * if it stumbled over a reaped memory. 530 */ 531 mm_flags_set(MMF_UNSTABLE, mm); 532 533 /* 534 * It might start racing with the dying task and compete for shared 535 * resources - e.g. page table lock contention has been observed. 536 * Reduce those races by reaping the oom victim from the other end 537 * of the address space. 538 */ 539 mas_for_each_rev(&mas, vma, 0) { 540 if (vma->vm_flags & (VM_HUGETLB|VM_PFNMAP)) 541 continue; 542 543 /* 544 * Only anonymous pages have a good chance to be dropped 545 * without additional steps which we cannot afford as we 546 * are OOM already. 547 * 548 * We do not even care about fs backed pages because all 549 * which are reclaimable have already been reclaimed and 550 * we do not want to block exit_mmap by keeping mm ref 551 * count elevated without a good reason. 552 */ 553 if (vma_is_anonymous(vma) || !(vma->vm_flags & VM_SHARED)) { 554 struct mmu_notifier_range range; 555 struct mmu_gather tlb; 556 557 mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, 558 mm, vma->vm_start, 559 vma->vm_end); 560 tlb_gather_mmu(&tlb, mm); 561 if (mmu_notifier_invalidate_range_start_nonblock(&range)) { 562 tlb_finish_mmu(&tlb); 563 ret = false; 564 continue; 565 } 566 unmap_page_range(&tlb, vma, range.start, range.end, NULL); 567 mmu_notifier_invalidate_range_end(&range); 568 tlb_finish_mmu(&tlb); 569 } 570 } 571 572 return ret; 573 } 574 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki