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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 B6A39C4646D for ; Fri, 10 Aug 2018 10:23:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 75FE222409 for ; Fri, 10 Aug 2018 10:23:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 75FE222409 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727838AbeHJMwh (ORCPT ); Fri, 10 Aug 2018 08:52:37 -0400 Received: from mx2.suse.de ([195.135.220.15]:50850 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726963AbeHJMwh (ORCPT ); Fri, 10 Aug 2018 08:52:37 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id DB919AFD8; Fri, 10 Aug 2018 10:23:19 +0000 (UTC) Subject: Re: [RFC v7 PATCH 1/4] mm: refactor do_munmap() to extract the common part To: Yang Shi , mhocko@kernel.org, willy@infradead.org, ldufour@linux.vnet.ibm.com, kirill@shutemov.name, akpm@linux-foundation.org, peterz@infradead.org, mingo@redhat.com, acme@kernel.org, alexander.shishkin@linux.intel.com, jolsa@redhat.com, namhyung@kernel.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <1533857763-43527-1-git-send-email-yang.shi@linux.alibaba.com> <1533857763-43527-2-git-send-email-yang.shi@linux.alibaba.com> From: Vlastimil Babka Openpgp: preference=signencrypt Autocrypt: addr=vbabka@suse.cz; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1533857763-43527-2-git-send-email-yang.shi@linux.alibaba.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/10/2018 01:36 AM, Yang Shi wrote: > Introduces three new helper functions: > * addr_ok() > * munmap_lookup_vma() > * munlock_vmas() > > They will be used by do_munmap() and the new do_munmap with zapping > large mapping early in the later patch. > > There is no functional change, just code refactor. > > Reviewed-by: Laurent Dufour > Signed-off-by: Yang Shi Acked-by: Vlastimil Babka Small nit below. > @@ -2764,13 +2812,7 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len, > */ > if (mm->locked_vm) { > struct vm_area_struct *tmp = vma; > - while (tmp && tmp->vm_start < end) { > - if (tmp->vm_flags & VM_LOCKED) { > - mm->locked_vm -= vma_pages(tmp); > - munlock_vma_pages_all(tmp); > - } > - tmp = tmp->vm_next; > - } > + munlock_vmas(tmp, end); No need for 'tmp' here. > } > > /* >