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[73.93.239.127]) by smtp.gmail.com with ESMTPSA id y3sm12003965pge.44.2021.09.14.11.37.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Sep 2021 11:37:38 -0700 (PDT) From: Yang Shi To: naoya.horiguchi@nec.com, hughd@google.com, kirill.shutemov@linux.intel.com, willy@infradead.org, osalvador@suse.de, akpm@linux-foundation.org Cc: shy828301@gmail.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/4] mm: hwpoison: handle non-anonymous THP correctly Date: Tue, 14 Sep 2021 11:37:18 -0700 Message-Id: <20210914183718.4236-5-shy828301@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210914183718.4236-1-shy828301@gmail.com> References: <20210914183718.4236-1-shy828301@gmail.com> MIME-Version: 1.0 X-Stat-Signature: z3164kj8xpgq1ppp5kctqzynn83zsyq5 Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=hGIOmUo0; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf28.hostedemail.com: domain of shy828301@gmail.com designates 209.85.216.54 as permitted sender) smtp.mailfrom=shy828301@gmail.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 1716890000A1 X-HE-Tag: 1631644659-712870 Content-Transfer-Encoding: quoted-printable 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: Currently hwpoison doesn't handle non-anonymous THP, but since v4.8 THP support for tmpfs and read-only file cache has been added. They could be offlined by split THP, just like anonymous THP. Signed-off-by: Yang Shi --- mm/memory-failure.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 3e06cb9d5121..6f72aab8ec4a 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1150,13 +1150,16 @@ static int __get_hwpoison_page(struct page *page) =20 if (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. + * We can't handle allocating or freeing THPs, so let's give + * it up. This should be better than triggering BUG_ON when + * kernel tries to touch the "partially handled" page. + * + * page->mapping won't be initialized until the page is added + * to rmap or page cache. Use this as an indicator for if + * this is an instantiated page. */ - if (!PageAnon(head)) { - pr_err("Memory failure: %#lx: non anonymous thp\n", + if (!head->mapping) { + pr_err("Memory failure: %#lx: non instantiated thp\n", page_to_pfn(page)); return 0; } @@ -1415,12 +1418,12 @@ 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))) { + if (!page->mapping || unlikely(split_huge_page(page))) { unsigned long pfn =3D page_to_pfn(page); =20 unlock_page(page); - if (!PageAnon(page)) - pr_info("%s: %#lx: non anonymous thp\n", msg, pfn); + if (!page->mapping) + pr_info("%s: %#lx: not instantiated thp\n", msg, pfn); else pr_info("%s: %#lx: thp split failed\n", msg, pfn); put_page(page); --=20 2.26.2