From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f44.google.com (mail-pa0-f44.google.com [209.85.220.44]) by kanga.kvack.org (Postfix) with ESMTP id 7992D6B0005 for ; Mon, 4 Apr 2016 02:06:28 -0400 (EDT) Received: by mail-pa0-f44.google.com with SMTP id fe3so136985964pab.1 for ; Sun, 03 Apr 2016 23:06:28 -0700 (PDT) Received: from lgeamrelo13.lge.com (LGEAMRELO13.lge.com. [156.147.23.53]) by mx.google.com with ESMTP id q84si39375101pfa.197.2016.04.03.23.06.27 for ; Sun, 03 Apr 2016 23:06:27 -0700 (PDT) From: Minchan Kim Subject: [PATCH] mm/hwpoison: fix wrong num_poisoned_pages account Date: Mon, 4 Apr 2016 15:06:32 +0900 Message-Id: <1459749992-7861-1-git-send-email-minchan@kernel.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-kernel@vger.kernel.org, Vlastimil Babka , linux-mm@kvack.org, Minchan Kim , stable@vger.kernel.org, Naoya Horiguchi Currently, migration code increases num_poisoned_pages on failed migration page as well as successfully migrated one at the trial of memory-failure. It will make the stat wrong. As well, it marks page as PG_HWPoison even if the migration trial failed. It would make we cannot recover the corrupted page using memory-failure facility. This patches fixes it. Cc: stable@vger.kernel.org Reported-by: Vlastimil Babka Acked-by: Naoya Horiguchi Signed-off-by: Minchan Kim --- mm/migrate.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/mm/migrate.c b/mm/migrate.c index 6c822a7b27e0..f9dfb18a4eba 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -975,7 +975,13 @@ static ICE_noinline int unmap_and_move(new_page_t get_new_page, dec_zone_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page)); /* Soft-offlined page shouldn't go through lru cache list */ - if (reason == MR_MEMORY_FAILURE) { + if (reason == MR_MEMORY_FAILURE && rc == MIGRATEPAGE_SUCCESS) { + /* + * With this release, we free successfully migrated + * page and set PG_HWPoison on just freed page + * intentionally. Although it's rather weird, it's how + * HWPoison flag works at the moment. + */ put_page(page); if (!test_set_page_hwpoison(page)) num_poisoned_pages_inc(); -- 1.9.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org