From patchwork Tue Sep 10 10:30:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oscar Salvador X-Patchwork-Id: 11139179 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C52BF76 for ; Tue, 10 Sep 2019 10:30:53 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 917BC2171F for ; Tue, 10 Sep 2019 10:30:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 917BC2171F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 984F36B0269; Tue, 10 Sep 2019 06:30:52 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 90BB36B0008; Tue, 10 Sep 2019 06:30:52 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 738FA6B000E; Tue, 10 Sep 2019 06:30:52 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0230.hostedemail.com [216.40.44.230]) by kanga.kvack.org (Postfix) with ESMTP id 4B76E6B0008 for ; Tue, 10 Sep 2019 06:30:52 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id 0C028181AC9B6 for ; Tue, 10 Sep 2019 10:30:52 +0000 (UTC) X-FDA: 75918642744.22.part19_41b9c497efd35 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,osalvador@suse.de,:n-horiguchi@ah.jp.nec.com:mhocko@kernel.org:mike.kravetz@oracle.com::linux-kernel@vger.kernel.org:osalvador@suse.de,RULES_HIT:30054:30070,0,RBL:195.135.220.15:@suse.de:.lbl8.mailshell.net-62.14.6.2 64.201.201.201,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:26,LUA_SUMMARY:none X-HE-Tag: part19_41b9c497efd35 X-Filterd-Recvd-Size: 2752 Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) by imf06.hostedemail.com (Postfix) with ESMTP for ; Tue, 10 Sep 2019 10:30:51 +0000 (UTC) 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 8374FAE5E; Tue, 10 Sep 2019 10:30:49 +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: [PATCH 03/10] mm,hwpoison-inject: don't pin for hwpoison_filter Date: Tue, 10 Sep 2019 12:30:09 +0200 Message-Id: <20190910103016.14290-4-osalvador@suse.de> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20190910103016.14290-1-osalvador@suse.de> References: <20190910103016.14290-1-osalvador@suse.de> 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: 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 5b7430bd83a6..0c8cdb80fd7d 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)