Message ID | c73d1543-532c-3da2-8cf2-a95363a14116@google.com |
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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id n124-20020a817282000000b00573898fb12bsm78328ywc.82.2023.07.23.15.26.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 Jul 2023 15:26:13 -0700 (PDT) Date: Sun, 23 Jul 2023 15:26:02 -0700 (PDT) From: Hugh Dickins <hughd@google.com> X-X-Sender: hugh@ripple.attlocal.net To: Andrew Morton <akpm@linux-foundation.org> cc: Jay Patel <jaypatel@linux.ibm.com>, Aneesh Kumar K V <aneesh.kumar@linux.ibm.com>, Hugh Dickins <hughd@google.com>, Miaohe Lin <linmiaohe@huawei.com>, David Hildenbrand <david@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Yang Shi <shy828301@gmail.com>, Peter Xu <peterx@redhat.com>, linux-kernel@vger.kernel.org, Song Liu <song@kernel.org>, sparclinux@vger.kernel.org, Alexander Gordeev <agordeev@linux.ibm.com>, Claudio Imbrenda <imbrenda@linux.ibm.com>, Will Deacon <will@kernel.org>, linux-s390@vger.kernel.org, Yu Zhao <yuzhao@google.com>, Ira Weiny <ira.weiny@intel.com>, Alistair Popple <apopple@nvidia.com>, Russell King <linux@armlinux.org.uk>, Matthew Wilcox <willy@infradead.org>, Steven Price <steven.price@arm.com>, Christoph Hellwig <hch@infradead.org>, Jason Gunthorpe <jgg@ziepe.ca>, linux-arm-kernel@lists.infradead.org, Zi Yan <ziy@nvidia.com>, Huang Ying <ying.huang@intel.com>, Axel Rasmussen <axelrasmussen@google.com>, Gerald Schaefer <gerald.schaefer@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Thomas Hellstrom <thomas.hellstrom@linux.intel.com>, Ralph Camp bell <rcampbell@nvidia.com>, Pasha Tatashin <pasha.tatashin@soleen.com>, Vasily Gorbik <gor@linux.ibm.com>, Anshuman Khandual <anshuman.khandual@arm.com>, Heiko Carstens <hca@linux.ibm.com>, Qi Zheng <zhengqi.arch@bytedance.com>, Suren Baghdasaryan <surenb@google.com>, Vlastimil Babka <vbabka@suse.cz>, SeongJae Park <sj@kernel.org>, Lorenzo Stoakes <lstoakes@gmail.com>, Jann Horn <jannh@google.com>, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, Naoya Horiguchi <naoya.horiguchi@nec.com>, Zack Rusin <zackr@vmware.com>, Vishal Moola <vishal.moola@gmail.com>, Minchan Kim <minchan@kernel.org>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Mel Gorman <mgorman@techsingularity.net>, "David S. Miller" <davem@davemloft.net>, Mike Rapoport <rppt@kernel.org>, Mike Kravetz <mike.kravetz@oracle.com> Subject: [PATCH v3 04/13 fix] powerpc: assert_pte_locked() use pte_offset_map_nolock(): fix In-Reply-To: <20230721131341.w5abuxcbohofpzwa@patel> Message-ID: <c73d1543-532c-3da2-8cf2-a95363a14116@google.com> References: <7cd843a9-aa80-14f-5eb2-33427363c20@google.com> <e8d56c95-c132-a82e-5f5f-7bb1b738b057@google.com> <87msztbiy8.fsf@linux.ibm.com> <392f311f-83ac-a5a2-d16e-2c7736d1b577@google.com> <6762c880-6d2b-233f-6786-7ad5b0472dc7@linux.ibm.com> <20230721131341.w5abuxcbohofpzwa@patel> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Spam-Status: No, score=-17.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE,USER_IN_DEF_DKIM_WL,USER_IN_DEF_SPF_WL autolearn=unavailable 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: <sparclinux.vger.kernel.org> X-Mailing-List: sparclinux@vger.kernel.org |
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diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c index 16b061af86d7..a3dcdb2d5b4b 100644 --- a/arch/powerpc/mm/pgtable.c +++ b/arch/powerpc/mm/pgtable.c @@ -323,6 +323,14 @@ void assert_pte_locked(struct mm_struct *mm, unsigned long addr) pud = pud_offset(p4d, addr); BUG_ON(pud_none(*pud)); pmd = pmd_offset(pud, addr); + /* + * khugepaged to collapse normal pages to hugepage, first set + * pmd to none to force page fault/gup to take mmap_lock. After + * pmd is set to none, we do a pte_clear which does this assertion + * so if we find pmd none, return. + */ + if (pmd_none(*pmd)) + return; pte = pte_offset_map_nolock(mm, pmd, addr, &ptl); BUG_ON(!pte); assert_spin_locked(ptl);
Aneesh points out that assert_pte_locked() still needs the pmd_none() check, to stop crashing in khugepaged: restore that comment and check. Andrew, when merging with original commit, please edit its 1st para to: Instead of pte_lockptr(), use the recently added pte_offset_map_nolock() in assert_pte_locked(). BUG if pte_offset_map_nolock() fails. Signed-off-by: Hugh Dickins <hughd@google.com> --- arch/powerpc/mm/pgtable.c | 8 ++++++++ 1 file changed, 8 insertions(+)