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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 8DFC9C433E3 for ; Thu, 16 Jul 2020 12:38:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 68055207CB for ; Thu, 16 Jul 2020 12:38:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728825AbgGPMij (ORCPT ); Thu, 16 Jul 2020 08:38:39 -0400 Received: from mx2.suse.de ([195.135.220.15]:35944 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728776AbgGPMic (ORCPT ); Thu, 16 Jul 2020 08:38:32 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id DB88EB976; Thu, 16 Jul 2020 12:38:34 +0000 (UTC) From: Oscar Salvador To: akpm@linux-foundation.org Cc: mhocko@suse.com, linux-mm@kvack.org, mike.kravetz@oracle.com, david@redhat.com, aneesh.kumar@linux.vnet.ibm.com, naoya.horiguchi@nec.com, linux-kernel@vger.kernel.org, Naoya Horiguchi , Oscar Salvador Subject: [PATCH v4 05/15] mm,hwpoison-inject: don't pin for hwpoison_filter Date: Thu, 16 Jul 2020 14:37:59 +0200 Message-Id: <20200716123810.25292-6-osalvador@suse.de> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20200716123810.25292-1-osalvador@suse.de> References: <20200716123810.25292-1-osalvador@suse.de> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Naoya Horiguchi Another memory error injection interface debugfs:hwpoison/corrupt-pfn also takes bogus refcount for hwpoison_filter(). It's justified because this does a coarse filter, expecting that memory_failure() redoes the check for sure. Signed-off-by: Naoya Horiguchi Signed-off-by: Oscar Salvador --- mm/hwpoison-inject.c | 18 +++++------------- 1 file changed, 5 insertions(+), 13 deletions(-) diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c index e488876b168a..1ae1ebc2b9b1 100644 --- a/mm/hwpoison-inject.c +++ b/mm/hwpoison-inject.c @@ -26,11 +26,6 @@ static int hwpoison_inject(void *data, u64 val) p = pfn_to_page(pfn); hpage = compound_head(p); - /* - * This implies unable to support free buddy pages. - */ - if (!get_hwpoison_page(p)) - return 0; if (!hwpoison_filter_enable) goto inject; @@ -40,23 +35,20 @@ static int hwpoison_inject(void *data, u64 val) * This implies unable to support non-LRU pages. */ if (!PageLRU(hpage) && !PageHuge(p)) - goto put_out; + return 0; /* - * do a racy check with elevated page count, to make sure PG_hwpoison - * will only be set for the targeted owner (or on a free page). + * do a racy check to make sure PG_hwpoison will only be set for + * the targeted owner (or on a free page). * memory_failure() will redo the check reliably inside page lock. */ err = hwpoison_filter(hpage); if (err) - goto put_out; + return 0; inject: pr_info("Injecting memory failure at pfn %#lx\n", pfn); - return memory_failure(pfn, MF_COUNT_INCREASED); -put_out: - put_hwpoison_page(p); - return 0; + return memory_failure(pfn, 0); } static int hwpoison_unpoison(void *data, u64 val) -- 2.26.2