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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: 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: <202605031109.uxckW5L3-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: 5C8C6C0002 X-Stat-Signature: wg4zmxduhoekbes7otto3ftof3tp4oqs X-HE-Tag: 1777778823-802815 X-HE-Meta: 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 2VWE1AVR 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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: arc-allnoconfig (https://download.01.org/0day-ci/archive/20260503/202605031109.uxckW5L3-lkp@intel.com/config) compiler: arc-linux-gcc (GCC) 15.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260503/202605031109.uxckW5L3-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/202605031109.uxckW5L3-lkp@intel.com/ All errors (new ones prefixed by >>): mm/oom_kill.c: In function '__oom_reap_task_mm': >> mm/oom_kill.c:523:9: error: implicit declaration of function 'mmu_notifier_oom_enter'; did you mean 'mmu_notifier_release'? [-Wimplicit-function-declaration] 523 | mmu_notifier_oom_enter(mm); | ^~~~~~~~~~~~~~~~~~~~~~ | mmu_notifier_release vim +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