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=-10.0 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 3D65BC46499 for ; Fri, 5 Jul 2019 06:13:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DAE7F218BA for ; Fri, 5 Jul 2019 06:13:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DAE7F218BA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2DCC56B0003; Fri, 5 Jul 2019 02:13:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 28C3A8E0003; Fri, 5 Jul 2019 02:13:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 17BB38E0001; Fri, 5 Jul 2019 02:13:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-ed1-f69.google.com (mail-ed1-f69.google.com [209.85.208.69]) by kanga.kvack.org (Postfix) with ESMTP id D31E06B0003 for ; Fri, 5 Jul 2019 02:13:00 -0400 (EDT) Received: by mail-ed1-f69.google.com with SMTP id f19so4982274edv.16 for ; Thu, 04 Jul 2019 23:13:00 -0700 (PDT) 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; bh=4BJwBlxckkqgvvseHgV8h2tIQ6CX036Eth8PujYAJk8=; b=Ss28CU43Ckun6OW0slFE/yJESc3mvS2hpsiBq7fN26WBqCnVMKdB9HkT5kPxY1d5u0 Wqc6acFD4Gv32k/7edLUsk1hbDFyXWLZYu0TE/btxQqXV39kwq1jQ0dG8Ot6iH7tGBcL LthKwgw3l4KYJLspLFzuIR6DZhYEX74us3YS1HdQd88OXNIBgUCbdN5yBUJCpgQNHQ3x 4Dle1DAKUKLyL5KI62GW3cIneLPFXSiyzHe/1fz+W2OUCaJ5EJlxgv+9o392cF+8iIfg zZvnOqYR0E/ID9K47iyoMdc6m3/g5G9rf41PyXt++CHQYCnUBaS/JmMSG0A+IsAKM6gm IqGw== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of anshuman.khandual@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=anshuman.khandual@arm.com X-Gm-Message-State: APjAAAWTKDwTx5DhgOeREHsPXOnfOYCCL1agnW9F5GUhEwVkDpuYmytc 5inKuxxj4u7oCoLLaOj4QH1ffjZE1JasrevQEm4SnJQpSBQUmgo43hkcjhxJENhgqsE9uP/s2nM aPOi3EA2n6RmaXb+1AkdoDAjVYHU2ma3QpS09RFDMPct/XnD2nCylEdrIZcYzkmArPg== X-Received: by 2002:a50:90af:: with SMTP id c44mr2443013eda.126.1562307180315; Thu, 04 Jul 2019 23:13:00 -0700 (PDT) X-Google-Smtp-Source: APXvYqxyxYIyDcovTKMa6OTwhhEtet2kjzwl4taK6Ou5mBZn/mBfwVnoysupscBV+ZhC5C45eLYS X-Received: by 2002:a50:90af:: with SMTP id c44mr2442952eda.126.1562307179533; Thu, 04 Jul 2019 23:12:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1562307179; cv=none; d=google.com; s=arc-20160816; b=jONy4i7MjFWFdJdlMECbEtMDUcnDG5Jmtli4k9XCTxOVuxjoNIb5IAm4o7jc1kbSTb QtD7qKQ2GYWfK+6Jiy1ZslCXyZSfi5r0HwLVn0hdjGqLT40RSE7KM15KZ0RfScmQO24b ezWXa5ToJANwi648TZjiUEhICsBzEbJX/2jS/3jyxleU9mFQ7fH67T2VGnPUZB1/zrmJ R0kSNV6tYvLxRqTW2wVLikj1DGA7ztCaPiHECgQkY0MwiVzKBL2vGsGYi0WdV3n1EeM5 DM7E7FKS+CHHsIbBsXK/ulhj+PeZMBaOji6GIUbxktTO2EkD367hVx6gPey+f4m9wsqM 88KQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=message-id:date:subject:cc:to:from; bh=4BJwBlxckkqgvvseHgV8h2tIQ6CX036Eth8PujYAJk8=; b=nmTGFZGaSG3ZOxApaP7YIgrpa0Bp8w7k1wplHF/32bvQQrMwUVz3pV57lvLIWf7fjt UDRI4Yzqd81FPymL7HNw49C950G8OXxGCA9maLJziYOYn0wAgsmlP6b+eol8KRp1T1zZ /KuGamBPl9mClu5rZILRNq6afwdiQWKTzfYfxWiK2h8f27y+DDxZOamAOQFlmHrD+xFH 3bwp4Pt/Ogxr5KKaGqaTmyrtn7gELwuNyGGO7xGX16BvgHbXsMOiHRQwQvbYrBgYYZEh yVAMko1PbLJlphqELg2LBZC99P4Od3syJnNpZbvykGlaFp4NP2UNcbmBf2gLYqs8I6Ia Xnxw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of anshuman.khandual@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=anshuman.khandual@arm.com Received: from foss.arm.com (foss.arm.com. [217.140.110.172]) by mx.google.com with ESMTP id c50si6523936edc.412.2019.07.04.23.12.59 for ; Thu, 04 Jul 2019 23:12:59 -0700 (PDT) Received-SPF: pass (google.com: domain of anshuman.khandual@arm.com designates 217.140.110.172 as permitted sender) client-ip=217.140.110.172; Authentication-Results: mx.google.com; spf=pass (google.com: domain of anshuman.khandual@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=anshuman.khandual@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id AE148360; Thu, 4 Jul 2019 23:12:58 -0700 (PDT) Received: from p8cg001049571a15.blr.arm.com (p8cg001049571a15.blr.arm.com [10.162.41.127]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 7B6353F246; Thu, 4 Jul 2019 23:14:50 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org Cc: Anshuman Khandual , Oscar Salvador , Michal Hocko , Qian Cai , Andrew Morton , linux-kernel@vger.kernel.org Subject: [PATCH] mm/isolate: Drop pre-validating migrate type in undo_isolate_page_range() Date: Fri, 5 Jul 2019 11:42:41 +0530 Message-Id: <1562307161-30554-1-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 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: unset_migratetype_isolate() already validates under zone lock that a given page has already been isolated as MIGRATE_ISOLATE. There is no need for another check before. Hence just drop this redundant validation. Cc: Oscar Salvador Cc: Michal Hocko Cc: Qian Cai Cc: Andrew Morton Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual --- Is there any particular reason to do this migratetype pre-check without zone lock before calling unsert_migrate_isolate() ? If not this should be removed. mm/page_isolation.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/page_isolation.c b/mm/page_isolation.c index e3638a5bafff..f529d250c8a5 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -243,7 +243,7 @@ int undo_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 || !is_migrate_isolate_page(page)) + if (!page) continue; unset_migratetype_isolate(page, migratetype); } -- 2.20.1