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=-5.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_MUTT 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 D417FC43381 for ; Fri, 22 Feb 2019 09:09:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8D3A220818 for ; Fri, 22 Feb 2019 09:09:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726766AbfBVJJc (ORCPT ); Fri, 22 Feb 2019 04:09:32 -0500 Received: from mx1.redhat.com ([209.132.183.28]:49016 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725860AbfBVJJb (ORCPT ); Fri, 22 Feb 2019 04:09:31 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 592D9C04BD35; Fri, 22 Feb 2019 09:09:31 +0000 (UTC) Received: from xz-x1 (ovpn-12-57.pek2.redhat.com [10.72.12.57]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 96832600C2; Fri, 22 Feb 2019 09:09:22 +0000 (UTC) Date: Fri, 22 Feb 2019 17:09:19 +0800 From: Peter Xu To: Jerome Glisse Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, David Hildenbrand , Hugh Dickins , Maya Gokhale , Pavel Emelyanov , Johannes Weiner , Martin Cracauer , Shaohua Li , Marty McFadden , Andrea Arcangeli , Mike Kravetz , Denis Plotnikov , Mike Rapoport , Mel Gorman , "Kirill A . Shutemov" , "Dr . David Alan Gilbert" Subject: Re: [PATCH v2 15/26] userfaultfd: wp: drop _PAGE_UFFD_WP properly when fork Message-ID: <20190222090919.GM8904@xz-x1> References: <20190212025632.28946-1-peterx@redhat.com> <20190212025632.28946-16-peterx@redhat.com> <20190221180631.GO2813@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20190221180631.GO2813@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Fri, 22 Feb 2019 09:09:31 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 21, 2019 at 01:06:31PM -0500, Jerome Glisse wrote: > On Tue, Feb 12, 2019 at 10:56:21AM +0800, Peter Xu wrote: > > UFFD_EVENT_FORK support for uffd-wp should be already there, except > > that we should clean the uffd-wp bit if uffd fork event is not > > enabled. Detect that to avoid _PAGE_UFFD_WP being set even if the VMA > > is not being tracked by VM_UFFD_WP. Do this for both small PTEs and > > huge PMDs. > > > > Signed-off-by: Peter Xu > > This patch must be earlier in the serie, before the patch that introduce > the userfaultfd API so that bisect can not end up on version where this > can happen. Yes it should be now? Since the API will be introduced until patch 21/26 ("userfaultfd: wp: add the writeprotect API to userfaultfd ioctl"). > > Otherwise the patch itself is: > > Reviewed-by: Jérôme Glisse Unless I found anything I've missed above... I'll temporarily pick this R-b for now then. Thanks, -- Peter Xu