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Howlett" To: Andrew Morton Cc: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Linus Torvalds , "Liam R. Howlett" Subject: [PATCH v2 3/4] mm/mmap: Change detached vma locking scheme Date: Fri, 14 Jul 2023 15:55:50 -0400 Message-Id: <20230714195551.894800-4-Liam.Howlett@oracle.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230714195551.894800-1-Liam.Howlett@oracle.com> References: <20230714195551.894800-1-Liam.Howlett@oracle.com> X-ClientProxiedBy: BL0PR0102CA0014.prod.exchangelabs.com (2603:10b6:207:18::27) To SN6PR10MB3022.namprd10.prod.outlook.com (2603:10b6:805:d8::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN6PR10MB3022:EE_|IA1PR10MB5922:EE_ X-MS-Office365-Filtering-Correlation-Id: 69f7f86e-c73d-4a2d-6a1d-08db84a45aac X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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o/2rN5PN20hCnl4VvWCH1qpB7IDJzDrYfEPE5RwW6eBln3BK81yhMPg9UtD5HFOpmhBbfqCRCfQYDNTyWp6Ar9CACbPqqc9m6d+K03CIOnMLVP+eqAZxjqnQc1YUlYr4YI9eZAu4Q6sn+ypuJ0qaS0RozuKBLYPU9QupUOifoiGrHV7ISWwLJHuoUI++0rR/dXCDd0fHTC4KQ0h5mqWVdFArgsliLHp6T9ts0BkVCNS4LdjAYVqYOjQg7HfpNp3CUkvzU8RXBvEFK4PGm187/Jq3NFCJBllDMB6uMgiGLDjTZjcAGa7YLc3oT+v6iUm6P3uCHVjLKTO78zRm5r+tZ1HsdDxP/0lzhLE0MP49YMtwpGDb81pMF5tPFnA3d6Vv7BxSgp19z1kqGCAn+9inTaevuIS/zUIqlASyf3gx3TNaWe/XnuywsaPm8IQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Don't set the lock to the mm lock so that the detached VMA tree does not complain about being unlocked when the mmap_lock is dropped prior to freeing the tree. Move the destroying of the detached tree outside the mmap lock all together. Cc: Linus Torvalds Signed-off-by: Liam R. Howlett --- mm/mmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 7b70379a8b3e..ab6cb00d377a 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2427,7 +2427,7 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma, unsigned long locked_vm = 0; MA_STATE(mas_detach, &mt_detach, 0, 0); mt_init_flags(&mt_detach, vmi->mas.tree->ma_flags & MT_FLAGS_LOCK_MASK); - mt_set_external_lock(&mt_detach, &mm->mmap_lock); + mt_detach.ma_external_lock = NULL; /* * If we need to split any vma, do it now to save pain later. @@ -2545,11 +2545,11 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma, /* Statistics and freeing VMAs */ mas_set(&mas_detach, start); remove_mt(mm, &mas_detach); - __mt_destroy(&mt_detach); validate_mm(mm); if (unlock) mmap_read_unlock(mm); + __mt_destroy(&mt_detach); return 0; clear_tree_failed: