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bh=hDqG76VNjmKFCkYaVQCHk1jK9PV7CZBX+MdyRpSUw7Y=; b=CaFAor7JdrXfi8+vNs4KOkeelfkQptUs/UWVR9Fxwg0aucomzDTtjMNI3Y3DvdgWNP wzvuEukT8nnTy8wxW/1SyUpLihHe5bGhAcj2aK+0nPOzhzVdjtubNfuRBXKHRDvrNsCw n+sL8/gh6kaw6SZusaXG5Oku0/C3H5c+y3hR2O8UmmwkUgnrk7HDvLCZCQAz8UpQAgaz fd8U2KdCJ7JH8U5IDQpH+a6coo2gMTBoRQqVSHf3iRQQ1lo632dKWRlK7caQyjbRajMO 14KN3mv278DxYYus2mId4lAItBmXuOjqyNNM6hX7ywzP2jiZqoKOvFDk0nf/Q5Ct9g4C pVWw== X-Gm-Message-State: AFqh2kp8e+dQFCnFn+dErp4nus9y36gqot+LlmJaNI2ltTrcoZE+v1dZ kMhsV//g+Iu3++8W2NWbiIro7Hd+yrw= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:200:9393:6f7a:d410:55ca]) (user=surenb job=sendgmr) by 2002:a17:90a:638b:b0:221:52e3:1f56 with SMTP id f11-20020a17090a638b00b0022152e31f56mr5166916pjj.225.1673297664681; Mon, 09 Jan 2023 12:54:24 -0800 (PST) Date: Mon, 9 Jan 2023 12:53:12 -0800 In-Reply-To: <20230109205336.3665937-1-surenb@google.com> Mime-Version: 1.0 References: <20230109205336.3665937-1-surenb@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20230109205336.3665937-18-surenb@google.com> Subject: [PATCH 17/41] mm/mmap: move VMA locking before anon_vma_lock_write call From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, laurent.dufour@fr.ibm.com, paulmck@kernel.org, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, punit.agrawal@bytedance.com, lstoakes@gmail.com, peterjung1337@gmail.com, rientjes@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, hughlynch@google.com, leewalsh@google.com, posk@google.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com, surenb@google.com X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754580085046159685?= X-GMAIL-MSGID: =?utf-8?q?1754580085046159685?= Move VMA flag modification (which now implies VMA locking) before anon_vma_lock_write to match the locking order of page fault handler. Signed-off-by: Suren Baghdasaryan --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/mmap.c b/mm/mmap.c index fa994ae903d9..53d885e70a54 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2953,13 +2953,13 @@ static int do_brk_flags(struct ma_state *mas, struct vm_area_struct *vma, if (mas_preallocate(mas, vma, GFP_KERNEL)) goto unacct_fail; + set_vm_flags(vma, VM_SOFTDIRTY); vma_adjust_trans_huge(vma, vma->vm_start, addr + len, 0); if (vma->anon_vma) { anon_vma_lock_write(vma->anon_vma); anon_vma_interval_tree_pre_update_vma(vma); } vma->vm_end = addr + len; - set_vm_flags(vma, VM_SOFTDIRTY); mas_store_prealloc(mas, vma); if (vma->anon_vma) {