From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E08C8ECE58E for ; Thu, 17 Oct 2019 14:21:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B6D8C21848 for ; Thu, 17 Oct 2019 14:21:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2440201AbfJQOVs (ORCPT ); Thu, 17 Oct 2019 10:21:48 -0400 Received: from mx2.suse.de ([195.135.220.15]:40648 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2440147AbfJQOVj (ORCPT ); Thu, 17 Oct 2019 10:21:39 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id B799CB489; Thu, 17 Oct 2019 14:21:37 +0000 (UTC) From: Oscar Salvador To: n-horiguchi@ah.jp.nec.com Cc: mhocko@kernel.org, mike.kravetz@oracle.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Oscar Salvador Subject: [RFC PATCH v2 14/16] mm,hwpoison: Return 0 if the page is already poisoned in soft-offline Date: Thu, 17 Oct 2019 16:21:21 +0200 Message-Id: <20191017142123.24245-15-osalvador@suse.de> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20191017142123.24245-1-osalvador@suse.de> References: <20191017142123.24245-1-osalvador@suse.de> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, there is an inconsistency when calling soft-offline from different paths on a page that is already poisoned. 1) madvise: madvise_inject_error skips any poisoned page and continues the loop. If that was the only page to madvise, it returns 0. 2) /sys/devices/system/memory/: Whe calling soft_offline_page_store()->soft_offline_page(), we return -EBUSY in case the page is already poisoned. This is inconsistent with a) the above example and b) memory_failure, where we return 0 if the page was poisoned. Fix this by dropping the PageHWPoison() check in madvise_inject_error, and let soft_offline_page return 0 if it finds the page already poisoned. Please, note that this represents an user-api change, since now the return error when calling soft_offline_page_store()->soft_offline_page() will be different. Signed-off-by: Oscar Salvador --- mm/madvise.c | 3 --- mm/memory-failure.c | 4 ++-- 2 files changed, 2 insertions(+), 5 deletions(-) diff --git a/mm/madvise.c b/mm/madvise.c index 8a0b1f901d72..9ca48345ce45 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -887,9 +887,6 @@ static int madvise_inject_error(int behavior, */ put_page(page); - if (PageHWPoison(page)) - continue; - if (behavior == MADV_SOFT_OFFLINE) { pr_info("Soft offlining pfn %#lx at process virtual address %#lx\n", pfn, start); diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 3d491c0d3f91..c038896bedf0 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1767,7 +1767,7 @@ static int __soft_offline_page(struct page *page) unlock_page(page); put_page(page); pr_info("soft offline: %#lx page already poisoned\n", pfn); - return -EBUSY; + return 0; } if (!PageHuge(page)) @@ -1866,7 +1866,7 @@ int soft_offline_page(struct page *page) if (PageHWPoison(page)) { pr_info("soft offline: %#lx page already poisoned\n", pfn); - return -EBUSY; + return 0; } get_online_mems(); -- 2.12.3