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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id q16sm1599162ota.3.2020.05.21.06.50.08 (version=TLS1 cipher=ECDHE-ECDSA-AES128-SHA bits=128/128); Thu, 21 May 2020 06:50:09 -0700 (PDT) Date: Thu, 21 May 2020 06:49:51 -0700 (PDT) From: Hugh Dickins X-X-Sender: hugh@eggly.anvils To: Andrew Morton cc: Anshuman Khandual , Naoya Horiguchi , Zi Yan , John Hubbard , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH mmotm] mm/vmstat: Add events for PMD based THP migration without split fix Message-ID: User-Agent: Alpine 2.11 (LSU 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII 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: Fix 5.7-rc6-mm1 page migration crash in unmap_and_move(): when the page to be migrated has been freed from under us, that is considered a MIGRATEPAGE_SUCCESS, but no newpage has been allocated (and I don't think it would ever need to be counted as a successful THP migration). Signed-off-by: Hugh Dickins --- Fix to mm-vmstat-add-events-for-pmd-based-thp-migration-without-split.patch mm/migrate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- 5.7-rc6-mm1/mm/migrate.c 2020-05-20 12:21:56.117693827 -0700 +++ linux/mm/migrate.c 2020-05-20 15:08:12.319476978 -0700 @@ -1248,7 +1248,7 @@ out: * we want to retry. */ if (rc == MIGRATEPAGE_SUCCESS) { - if (PageTransHuge(newpage)) + if (newpage && PageTransHuge(newpage)) thp_migration_success(true); put_page(page); if (reason == MR_MEMORY_FAILURE) {