From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl1-f200.google.com (mail-pl1-f200.google.com [209.85.214.200]) by kanga.kvack.org (Postfix) with ESMTP id 401168E0001 for ; Sat, 15 Sep 2018 05:45:21 -0400 (EDT) Received: by mail-pl1-f200.google.com with SMTP id w11-v6so5452670plq.8 for ; Sat, 15 Sep 2018 02:45:21 -0700 (PDT) Received: from bombadil.infradead.org (bombadil.infradead.org. [2607:7c80:54:e::133]) by mx.google.com with ESMTPS id e34-v6si10081807plb.2.2018.09.15.02.45.20 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 15 Sep 2018 02:45:20 -0700 (PDT) Date: Sat, 15 Sep 2018 02:45:15 -0700 From: Matthew Wilcox Subject: Re: [RFC v10 PATCH 3/3] mm: unmap VM_PFNMAP mappings with optimized path Message-ID: <20180915094515.GC31572@bombadil.infradead.org> References: <1536957299-43536-1-git-send-email-yang.shi@linux.alibaba.com> <1536957299-43536-4-git-send-email-yang.shi@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1536957299-43536-4-git-send-email-yang.shi@linux.alibaba.com> Sender: owner-linux-mm@kvack.org List-ID: To: Yang Shi Cc: mhocko@kernel.org, ldufour@linux.vnet.ibm.com, vbabka@suse.cz, kirill@shutemov.name, akpm@linux-foundation.org, dave.hansen@intel.com, oleg@redhat.com, srikar@linux.vnet.ibm.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org On Sat, Sep 15, 2018 at 04:34:59AM +0800, Yang Shi wrote: > When unmapping VM_PFNMAP mappings, vm flags need to be updated. Since > the vmas have been detached, so it sounds safe to update vm flags with > read mmap_sem. > > Cc: Michal Hocko > Cc: Vlastimil Babka > Signed-off-by: Yang Shi Reviewed-by: Matthew Wilcox