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b=rDuGQyvQ6scJ3VJ/fhObAMeQ3sLEUxfPWer425Dq2h+HufO7Pxo86UYc2b6lGPIrAT Dgwfb1F2GpEf/IgJ1Q/PWjgjM1IGSvtTkx7VXYX0PBiJFomrF96E3Ly7pVXakzGpTUPV e1GJEPzJwRerE6ltWfRaDxGY+qDxdmyqwbTse3E2iw4JrX3e5F9u69kyQoZBfjslm4K3 htgJyt7jjW5gkTYWt6KNZsGukjGjQvhAlR73egtSis0W5mX8AAwdBdgUy2k5NDi/X2U5 f6i5CiikEztGqNBcIRX5B62w1vLs9IRGrwl14FVTTqDKIavBjDn0RL9qlwEyipG8pf0y MOdw== X-Gm-Message-State: AFqh2kpYpIvbyj2AHE+47RHokxnwbKDuKrdaL2L4qL307bJFaw58xJkQ kr6yJnrM39Abb5HRVjF4RACwlgBy8gA= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:200:f7b0:20e8:ce66:f98]) (user=surenb job=sendgmr) by 2002:a0d:e582:0:b0:4df:96d1:f67a with SMTP id o124-20020a0de582000000b004df96d1f67amr4204399ywe.246.1674689769324; Wed, 25 Jan 2023 15:36:09 -0800 (PST) Date: Wed, 25 Jan 2023 15:35:52 -0800 In-Reply-To: <20230125233554.153109-1-surenb@google.com> Mime-Version: 1.0 References: <20230125233554.153109-1-surenb@google.com> X-Mailer: git-send-email 2.39.1.456.gfc5497dd1b-goog Message-ID: <20230125233554.153109-6-surenb@google.com> Subject: [PATCH v3 5/7] mm: replace vma->vm_flags indirect modification in ksm_madvise 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, paulmck@kernel.org, mingo@redhat.com, will@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?1756039777120998554?= X-GMAIL-MSGID: =?utf-8?q?1756039777120998554?= Replace indirect modifications to vma->vm_flags with calls to modifier functions to be able to track flag changes and to keep vma locking correctness. Signed-off-by: Suren Baghdasaryan Acked-by: Michal Hocko Acked-by: Mel Gorman --- arch/powerpc/kvm/book3s_hv_uvmem.c | 5 ++++- arch/s390/mm/gmap.c | 5 ++++- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_hv_uvmem.c index 1d67baa5557a..325a7a47d348 100644 --- a/arch/powerpc/kvm/book3s_hv_uvmem.c +++ b/arch/powerpc/kvm/book3s_hv_uvmem.c @@ -393,6 +393,7 @@ static int kvmppc_memslot_page_merge(struct kvm *kvm, { unsigned long gfn = memslot->base_gfn; unsigned long end, start = gfn_to_hva(kvm, gfn); + unsigned long vm_flags; int ret = 0; struct vm_area_struct *vma; int merge_flag = (merge) ? MADV_MERGEABLE : MADV_UNMERGEABLE; @@ -409,12 +410,14 @@ static int kvmppc_memslot_page_merge(struct kvm *kvm, ret = H_STATE; break; } + vm_flags = vma->vm_flags; ret = ksm_madvise(vma, vma->vm_start, vma->vm_end, - merge_flag, &vma->vm_flags); + merge_flag, &vm_flags); if (ret) { ret = H_STATE; break; } + reset_vm_flags(vma, vm_flags); start = vma->vm_end; } while (end > vma->vm_end); diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index 3a695b8a1e3c..d5eb47dcdacb 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -2587,14 +2587,17 @@ int gmap_mark_unmergeable(void) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; + unsigned long vm_flags; int ret; VMA_ITERATOR(vmi, mm, 0); for_each_vma(vmi, vma) { + vm_flags = vma->vm_flags; ret = ksm_madvise(vma, vma->vm_start, vma->vm_end, - MADV_UNMERGEABLE, &vma->vm_flags); + MADV_UNMERGEABLE, &vm_flags); if (ret) return ret; + reset_vm_flags(vma, vm_flags); } mm->def_flags &= ~VM_MERGEABLE; return 0;