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[175.177.40.128]) by smtp.gmail.com with ESMTPSA id r15sm21663826pgh.39.2021.02.08.22.21.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Feb 2021 22:21:53 -0800 (PST) From: Naoya Horiguchi To: linux-mm@kvack.org Cc: Andrew Morton , Michal Hocko , Oscar Salvador , Tony Luck , Matthew Wilcox , "Aneesh Kumar K.V" , Naoya Horiguchi , linux-kernel@vger.kernel.org Subject: [PATCH v1] mm, hwpoison: enable error handling on shmem thp Date: Tue, 9 Feb 2021 15:21:28 +0900 Message-Id: <20210209062128.453814-1-nao.horiguchi@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Naoya Horiguchi Currently hwpoison code checks PageAnon() for thp and refuses to handle errors on non-anonymous thps (just for historical reason). We now support non-anonymou thp like shmem one, so this patch suggests to enable to handle shmem thps. Fortunately, we already have can_split_huge_page() to check if a give thp is splittable, so this patch relies on it. Signed-off-by: Naoya Horiguchi --- mm/memory-failure.c | 34 +++++++++------------------------- 1 file changed, 9 insertions(+), 25 deletions(-) diff --git v5.11-rc6/mm/memory-failure.c v5.11-rc6_patched/mm/memory-failure.c index e9481632fcd1..8c1575de0507 100644 --- v5.11-rc6/mm/memory-failure.c +++ v5.11-rc6_patched/mm/memory-failure.c @@ -956,20 +956,6 @@ static int __get_hwpoison_page(struct page *page) { struct page *head = compound_head(page); - if (!PageHuge(head) && PageTransHuge(head)) { - /* - * Non anonymous thp exists only in allocation/free time. We - * can't handle such a case correctly, so let's give it up. - * This should be better than triggering BUG_ON when kernel - * tries to touch the "partially handled" page. - */ - if (!PageAnon(head)) { - pr_err("Memory failure: %#lx: non anonymous thp\n", - page_to_pfn(page)); - return 0; - } - } - if (get_page_unless_zero(head)) { if (head == compound_head(page)) return 1; @@ -1197,21 +1183,19 @@ static int identify_page_state(unsigned long pfn, struct page *p, static int try_to_split_thp_page(struct page *page, const char *msg) { - lock_page(page); - if (!PageAnon(page) || unlikely(split_huge_page(page))) { - unsigned long pfn = page_to_pfn(page); + struct page *head; + lock_page(page); + head = compound_head(page); + if (PageTransHuge(head) && can_split_huge_page(head, NULL) && + !split_huge_page(page)) { unlock_page(page); - if (!PageAnon(page)) - pr_info("%s: %#lx: non anonymous thp\n", msg, pfn); - else - pr_info("%s: %#lx: thp split failed\n", msg, pfn); - put_page(page); - return -EBUSY; + return 0; } + pr_info("%s: %#lx: thp split failed\n", msg, page_to_pfn(page)); unlock_page(page); - - return 0; + put_page(page); + return -EBUSY; } static int memory_failure_hugetlb(unsigned long pfn, int flags) -- 2.25.1