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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,UNPARSEABLE_RELAY, 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 F14D8C43381 for ; Mon, 18 Feb 2019 21:07:42 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B94ED217F5 for ; Mon, 18 Feb 2019 21:07:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B94ED217F5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6F0418E0008; Mon, 18 Feb 2019 16:07:42 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 6A1F18E0002; Mon, 18 Feb 2019 16:07:42 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 569C88E0008; Mon, 18 Feb 2019 16:07:42 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by kanga.kvack.org (Postfix) with ESMTP id 02E8F8E0002 for ; Mon, 18 Feb 2019 16:07:42 -0500 (EST) Received: by mail-wr1-f69.google.com with SMTP id s5so8094933wrp.17 for ; Mon, 18 Feb 2019 13:07:41 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=WMV4Y+Xxwx0amh79b7ogT26X55X7KS8eKOuS0jAVMLw=; b=msLeedaXi6T3llmVK1F3Gt+CRXpBKGOTNY8XljBxnI52DP3LBgv+W+/JTvfxtLdryw EgjDeB9nq5wlk9+74Dc5nAxnC333s0uKh8gprscZGPVOMc6Iro5OK/oe6Vv+jafm8CzN FvVVgnME9qKYDGxryOXVVSZBQTvFHqAT2PJ4QoxTl+9n5LtyguxWD202by0b/MDHnPhk ZXkB/55GqMBRjshwz6uvigdymKpPNMGT/7QhYtsQ8Qy0kFBcuZos8rcJdAQlUkpiYCLJ c2oDtZuorUFDhN7XPnNnA5MthNCYkeRb5m+9jLvZskXpvgnE2WHEt4GiFmRzK1Z09ga6 3hLA== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of krisman@collabora.com designates 46.235.227.227 as permitted sender) smtp.mailfrom=krisman@collabora.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=collabora.com X-Gm-Message-State: AHQUAubKxyB1AAxTMud7PeyFvTKPHLqnMSnbDUjlxnXqDOGEfUdsLCO6 hlDDDEbT2ooIbgEp8YxuQG/hxRmppvShvGr35hU17cxPrKFo7++weR8yRgs10TDBLWxC9kCyxXi P6j+1Lc/O7paYdyEyN82/EtnX3TY2asBgB41WMChHiTovpW4TpIBu7kuySR3KvL7kqQ== X-Received: by 2002:a1c:cf82:: with SMTP id f124mr458126wmg.95.1550524061526; Mon, 18 Feb 2019 13:07:41 -0800 (PST) X-Google-Smtp-Source: AHgI3IbcJcCenvcMS+ro+i37t+yB4OCXSx7E57ie+fUKpkVgijfBBpMzEEaqp2aCFYBY/MMCFPRv X-Received: by 2002:a1c:cf82:: with SMTP id f124mr458098wmg.95.1550524060639; Mon, 18 Feb 2019 13:07:40 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1550524060; cv=none; d=google.com; s=arc-20160816; b=yk6lq7ViewrbeqyxPD/Fg5aucxkjMY6VnjUQQZKgsNNuxbQ0iLBokw6VunyFifAu0d sLq2MOAs7sJMkch+lGlLFcrdOqTVDlQbHhlWrd6wgsJPEn2Bjp6qWVMCcsCJtb9Ewwtk nH9w0hSWh7NsCSuIyUTgOmgfo5tlcO9oVkLN+GfiGsWzLytMZTyLQXSf0681KYIH3DGX OgRSkdtcyIEfJnqYepzM6yzcVYn6WLqs3Oe4ICnlyZ1KMhQKDsU2k/a2NhxtawKSEcPN phNfSgEpUmBosh0lmxaF78XOOLznylAHIBrJNfjoMLGXPscabEmZmNJd7JhBRUcX0Sx1 DqKA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from; bh=WMV4Y+Xxwx0amh79b7ogT26X55X7KS8eKOuS0jAVMLw=; b=uPyO7omhmOxbkuVqy4Hgf7SnAbFy+cRzqtRZ4VSuwWpb39yXFphNh8B57ftUi6bkyD rNPxnWMOjnIAQ2YqwEvo+Q8a2iECWembLVm9L8oP5tUVTxs23cBfjc1SHoHUq5t5bReA E2Q3K+GmwD72UDcdIUONS7NPRStwZxxrMjjJwA4k/kWmmjtJJpuHCJnaG23plwwNVjN6 Zya1vnXlkzaAAns7CfGV7nnwCMERfSNhcglZ4tTsD1UbSsjBzxJ0SQRa9eY31xpjYlXy dqmVJmuh3nfbrK5E1ts/HBnGQtaE6TDOPJIDCuqxsrBIauWaS/uj2fv7aMz+6mqhZ1ZG tIWA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of krisman@collabora.com designates 46.235.227.227 as permitted sender) smtp.mailfrom=krisman@collabora.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=collabora.com Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk. [46.235.227.227]) by mx.google.com with ESMTPS id s15si4528892wrt.209.2019.02.18.13.07.40 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 18 Feb 2019 13:07:40 -0800 (PST) Received-SPF: pass (google.com: domain of krisman@collabora.com designates 46.235.227.227 as permitted sender) client-ip=46.235.227.227; Authentication-Results: mx.google.com; spf=pass (google.com: domain of krisman@collabora.com designates 46.235.227.227 as permitted sender) smtp.mailfrom=krisman@collabora.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=collabora.com Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: krisman) with ESMTPSA id 2AB6027F9AB From: Gabriel Krisman Bertazi To: linux-mm@kvack.org Cc: labbott@redhat.com, kernel@collabora.com, gael.portay@collabora.com, mike.kravetz@oracle.com, m.szyprowski@samsung.com, Gabriel Krisman Bertazi Subject: [PATCH 5/6] page_isolation: Propagate temporary pageblock isolation error Date: Mon, 18 Feb 2019 16:07:14 -0500 Message-Id: <20190218210715.1066-6-krisman@collabora.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190218210715.1066-1-krisman@collabora.com> References: <20190218210715.1066-1-krisman@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: If the page isolation failed because of racing the setup of the pages migrate type, it is very likely that a further attempt will succeed. In this case, instead of -EBUSY, return -EAGAIN, to let callers handle this condition properly. Signed-off-by: Gabriel Krisman Bertazi --- mm/page_isolation.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/mm/page_isolation.c b/mm/page_isolation.c index ce323e56b34d..a8169d8ea02d 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -30,10 +30,12 @@ static int set_migratetype_isolate(struct page *page, int migratetype, int isol_ /* * We assume the caller intended to SET migrate type to isolate. * If it is already set, then someone else must have raced and - * set it before us. Return -EBUSY + * set it before us. Return -EAGAIN */ - if (is_migrate_isolate_page(page)) + if (is_migrate_isolate_page(page)) { + ret = -EAGAIN; goto out; + } pfn = page_to_pfn(page); arg.start_pfn = pfn; @@ -188,6 +190,7 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn, unsigned long pfn; unsigned long undo_pfn; struct page *page; + int ret = -EBUSY; BUG_ON(!IS_ALIGNED(start_pfn, pageblock_nr_pages)); BUG_ON(!IS_ALIGNED(end_pfn, pageblock_nr_pages)); @@ -196,10 +199,13 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn, pfn < end_pfn; pfn += pageblock_nr_pages) { page = __first_valid_page(pfn, pageblock_nr_pages); - if (page && - set_migratetype_isolate(page, migratetype, flags)) { - undo_pfn = pfn; - goto undo; + if (page) { + ret = set_migratetype_isolate(page, migratetype, + flags); + if (ret) { + undo_pfn = pfn; + goto undo; + } } } return 0; @@ -213,7 +219,7 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn, unset_migratetype_isolate(page, migratetype); } - return -EBUSY; + return ret; } /* -- 2.20.1