From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CEC8131619E for ; Tue, 27 Jan 2026 04:04:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769486657; cv=none; b=YBf61eIrI/ujFEMvgjs0FOQuM32nyrdRoIOM2pLdrfOEZ0wu+bRPgkAWKGd8X22I5OjIU5tnwKuv5bRGTK+R3BVvAXS2BG+EpwOIgMXZm+7jc3b8acQ4JkgE1efkZoXp30kwtWd3vFjlFC3FcsRGSn/xGjAYnffYlGS1TpYpRyU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769486657; c=relaxed/simple; bh=F2Zm1sb4st/I+KxA2lHuBFZ3o6YCMvP0R5IVHEMVCe8=; h=Date:To:From:Subject:Message-Id; b=BHlCnqZamun2nCeYZSThdqYO4U27zgcFB39hk2dkkt5xMWDBq0JRICHZTK8u26/Kk7vE4Bzlc42sTwe+mF9G8Pr5suloKihDQ4R8kIriiYgbhivsKXCzMDiWyjBpuhIo8FASrWxRx7U105x7AzOC6pLalnih97Y2eJ+ctu2gsf0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=UvZtCtnL; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="UvZtCtnL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9949DC116C6; Tue, 27 Jan 2026 04:04:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1769486657; bh=F2Zm1sb4st/I+KxA2lHuBFZ3o6YCMvP0R5IVHEMVCe8=; h=Date:To:From:Subject:From; b=UvZtCtnLLGiVJvCCODxa/lA2o3Gm3SAAJLkj42hEVV+Yu8Wgmaq/MaV8IDtTT7hnp c49kIZdUNVCHF2446UQmrKvg7kati3tgXb6POh0RnceHhJC2hzfWWgugX0MZXkUQgD dF5UWi/t8ZFVx8zMWwcy/3bHUzwkMP7pGPyXtp4M= Date: Mon, 26 Jan 2026 20:04:17 -0800 To: mm-commits@vger.kernel.org,v-songbaohua@oppo.com,vbabka@suse.cz,surenb@google.com,shakeel.butt@linux.dev,rppt@kernel.org,riel@surriel.com,pfalcato@suse.de,mhocko@suse.com,Liam.Howlett@oracle.com,jannh@google.com,harry.yoo@oracle.com,david@kernel.org,chriscli@google.com,lorenzo.stoakes@oracle.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-rmap-skip-unfaulted-vmas-on-anon_vma-clone-unlink.patch removed from -mm tree Message-Id: <20260127040417.9949DC116C6@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/rmap: skip unfaulted VMAs on anon_vma clone, unlink has been removed from the -mm tree. Its filename was mm-rmap-skip-unfaulted-vmas-on-anon_vma-clone-unlink.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Lorenzo Stoakes Subject: mm/rmap: skip unfaulted VMAs on anon_vma clone, unlink Date: Sun, 18 Jan 2026 14:50:39 +0000 For both anon_vma_clone() and unlink_anon_vmas(), if the source VMA or the VMA to be linked are unfaulted (e.g. !vma->anon_vma), then the functions do nothing. Simply exit early in these cases. In the unlink_anon_vmas() case we can also remove a conditional that checks whether vma->anon_vma is set. Link: https://lkml.kernel.org/r/085a25f7528e1c8c687276e9b856e88dc8f105ca.1768746221.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes Reviewed-by: Liam R. Howlett Reviewed-by: Suren Baghdasaryan Cc: Barry Song Cc: Chris Li Cc: David Hildenbrand Cc: Harry Yoo Cc: Jann Horn Cc: Michal Hocko Cc: Mike Rapoport Cc: Pedro Falcato Cc: Rik van Riel Cc: Shakeel Butt Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/rmap.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) --- a/mm/rmap.c~mm-rmap-skip-unfaulted-vmas-on-anon_vma-clone-unlink +++ a/mm/rmap.c @@ -313,6 +313,9 @@ int anon_vma_clone(struct vm_area_struct check_anon_vma_clone(dst, src); + if (!src->anon_vma) + return 0; + list_for_each_entry_reverse(pavc, &src->anon_vma_chain, same_vma) { struct anon_vma *anon_vma; @@ -478,7 +481,10 @@ void unlink_anon_vmas(struct vm_area_str mmap_assert_locked(vma->vm_mm); /* Unfaulted is a no-op. */ - VM_WARN_ON_ONCE(!vma->anon_vma && !list_empty(&vma->anon_vma_chain)); + if (!vma->anon_vma) { + VM_WARN_ON_ONCE(!list_empty(&vma->anon_vma_chain)); + return; + } /* * Unlink each anon_vma chained to the VMA. This list is ordered @@ -502,15 +508,13 @@ void unlink_anon_vmas(struct vm_area_str list_del(&avc->same_vma); anon_vma_chain_free(avc); } - if (vma->anon_vma) { - vma->anon_vma->num_active_vmas--; - /* - * vma would still be needed after unlink, and anon_vma will be prepared - * when handle fault. - */ - vma->anon_vma = NULL; - } + vma->anon_vma->num_active_vmas--; + /* + * vma would still be needed after unlink, and anon_vma will be prepared + * when handle fault. + */ + vma->anon_vma = NULL; unlock_anon_vma_root(root); /* _ Patches currently in -mm which might be from lorenzo.stoakes@oracle.com are selftests-mm-remove-virtual_address_range-test.patch mm-vma-rename-vma_lock_offset-to-vm_refcnt_exclude_readers_flag.patch mm-vma-document-possible-vma-vm_refcnt-values-and-reference-comment.patch mm-vma-rename-is_vma_write_only-separate-out-shared-refcount-put.patch mm-vma-adduse-vma-lockdep-acquire-release-defines.patch mm-vma-de-duplicate-__vma_enter_locked-error-path.patch mm-vma-clean-up-__vma_enter-exit_locked.patch mm-vma-introduce-helper-struct-thread-through-exclusive-lock-fns.patch mm-vma-improve-and-document-__is_vma_write_locked.patch mm-vma-improve-and-document-__is_vma_write_locked-fix.patch mm-vma-update-vma_assert_locked-to-use-lockdep.patch mm-vma-update-vma_assert_locked-to-use-lockdep-fix.patch mm-vma-add-and-use-vma_assert_stabilised.patch mm-vma-remove-__private-sparse-decoration-from-vma_flags_t.patch mm-rename-vma_flag_test-set_atomic-to-vma_test-set_atomic_flag.patch mm-add-mk_vma_flags-bitmap-flag-macro-helper.patch tools-bitmap-add-missing-bitmap_.patch mm-add-basic-vma-flag-operation-helper-functions.patch mm-update-hugetlbfs-to-use-vma-flags-on-mmap_prepare.patch mm-update-secretmem-to-use-vma-flags-on-mmap_prepare.patch mm-update-shmem__file_-functions-to-use-vma_flags_t.patch mm-update-all-remaining-mmap_prepare-users-to-use-vma_flags_t.patch mm-make-vm_area_desc-utilise-vma_flags_t-only.patch tools-testing-vma-separate-vma-userland-tests-into-separate-files.patch tools-testing-vma-separate-out-vma_internalh-into-logical-headers.patch tools-testing-vma-add-vma-userland-tests-for-vma-flag-functions.patch