From patchwork Fri Jan 31 06:14:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 11359263 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 47D8C13A4 for ; Fri, 31 Jan 2020 06:15:01 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0B4D921734 for ; Fri, 31 Jan 2020 06:15:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="KLEPScW9" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0B4D921734 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 599A06B0545; Fri, 31 Jan 2020 01:14:53 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 4F8296B0547; Fri, 31 Jan 2020 01:14:53 -0500 (EST) 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 39D566B0548; Fri, 31 Jan 2020 01:14:53 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0240.hostedemail.com [216.40.44.240]) by kanga.kvack.org (Postfix) with ESMTP id 194FA6B0545 for ; Fri, 31 Jan 2020 01:14:53 -0500 (EST) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id CE097181AEF0B for ; Fri, 31 Jan 2020 06:14:52 +0000 (UTC) X-FDA: 76436916024.13.base01_2a93294057f1b X-Spam-Summary: 2,0,0,368d063fc033987d,d41d8cd98f00b204,akpm@linux-foundation.org,:akpm@linux-foundation.org:david@redhat.com:jhubbard@nvidia.com:linmiaohe@huawei.com::mm-commits@vger.kernel.org:richardw.yang@linux.intel.com:rientjes@google.com:torvalds@linux-foundation.org,RULES_HIT:41:69:355:379:800:960:967:973:988:989:1260:1263:1345:1359:1381:1431:1437:1534:1542:1711:1730:1747:1777:1792:2393:2525:2559:2563:2682:2685:2859:2902:2933:2937:2939:2942:2945:2947:2951:2954:3022:3138:3139:3140:3141:3142:3353:3865:3866:3867:3868:3870:3872:3934:3936:3938:3941:3944:3947:3950:3953:3956:3959:4321:5007:6119:6261:6653:7576:7808:9025:9391:9545:10004:10913:11026:11658:11914:12043:12048:12114:12296:12297:12438:12517:12519:12555:12679:12683:12783:12986:13161:13229:13255:13846:14096:14181:14721:14849:21080:21324:21433:21451:21627:21819:21939:21990:30054:30064,0,RBL:error,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,LF time:2,L X-HE-Tag: base01_2a93294057f1b X-Filterd-Recvd-Size: 3619 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf43.hostedemail.com (Postfix) with ESMTP for ; Fri, 31 Jan 2020 06:14:52 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8A28B214D8; Fri, 31 Jan 2020 06:14:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580451291; bh=54/1G+aTyLTHAJCh1kqT4NqNe7rWql1DJbccFamLVCI=; h=Date:From:To:Subject:In-Reply-To:From; b=KLEPScW9RaEWyVerq/LR0n6sojW/gZn239Fcp3+lKvv+QS/zZbx4k3WTehNMf1XtR Cr28qyw/AJ4JRfpVwItnL9kEJKEcMrss2r9H3VV5Qf1tiurHBQ48MscEzU5pn1XRBP Vxc1Azz75uAGQu0mcfXkAu9Fwbsb3P/jnYBBrJcU= Date: Thu, 30 Jan 2020 22:14:51 -0800 From: Andrew Morton To: akpm@linux-foundation.org, david@redhat.com, jhubbard@nvidia.com, linmiaohe@huawei.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, richardw.yang@linux.intel.com, rientjes@google.com, torvalds@linux-foundation.org Subject: [patch 069/118] mm/mmap.c: get rid of odd jump labels in find_mergeable_anon_vma() Message-ID: <20200131061451.xSfMSpwca%akpm@linux-foundation.org> In-Reply-To: <20200130221021.5f0211c56346d5485af07923@linux-foundation.org> User-Agent: s-nail v14.8.16 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: Miaohe Lin Subject: mm/mmap.c: get rid of odd jump labels in find_mergeable_anon_vma() The jump labels try_prev and none are not really needed in find_mergeable_anon_vma(), eliminate them to improve readability. Link: http://lkml.kernel.org/r/1574079844-17493-1-git-send-email-linmiaohe@huawei.com Signed-off-by: Miaohe Lin Reviewed-by: David Hildenbrand Reviewed-by: John Hubbard Reviewed-by: Wei Yang Acked-by: David Rientjes Signed-off-by: Andrew Morton --- mm/mmap.c | 30 +++++++++++++----------------- 1 file changed, 13 insertions(+), 17 deletions(-) --- a/mm/mmap.c~mm-get-rid-of-odd-jump-labels-in-find_mergeable_anon_vma +++ a/mm/mmap.c @@ -1270,26 +1270,22 @@ static struct anon_vma *reusable_anon_vm */ struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *vma) { - struct anon_vma *anon_vma; - struct vm_area_struct *near; + struct anon_vma *anon_vma = NULL; - near = vma->vm_next; - if (!near) - goto try_prev; + /* Try next first. */ + if (vma->vm_next) { + anon_vma = reusable_anon_vma(vma->vm_next, vma, vma->vm_next); + if (anon_vma) + return anon_vma; + } - anon_vma = reusable_anon_vma(near, vma, near); - if (anon_vma) - return anon_vma; -try_prev: - near = vma->vm_prev; - if (!near) - goto none; + /* Try prev next. */ + if (vma->vm_prev) + anon_vma = reusable_anon_vma(vma->vm_prev, vma->vm_prev, vma); - anon_vma = reusable_anon_vma(near, near, vma); - if (anon_vma) - return anon_vma; -none: /* + * We might reach here with anon_vma == NULL if we can't find + * any reusable anon_vma. * There's no absolute need to look only at touching neighbours: * we could search further afield for "compatible" anon_vmas. * But it would probably just be a waste of time searching, @@ -1297,7 +1293,7 @@ none: * We're trying to allow mprotect remerging later on, * not trying to minimize memory used for anon_vmas. */ - return NULL; + return anon_vma; } /*