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=-5.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 B9773C3F2C6 for ; Tue, 3 Mar 2020 17:51:48 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3C691206D5 for ; Tue, 3 Mar 2020 17:51:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3C691206D5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 48X4MQ077rzDqVv for ; Wed, 4 Mar 2020 04:51:46 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=suse.cz (client-ip=195.135.220.15; helo=mx2.suse.de; envelope-from=vbabka@suse.cz; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.cz Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 48X4HT5Nn1zDqSw for ; Wed, 4 Mar 2020 04:48:21 +1100 (AEDT) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 54EB5AC9A; Tue, 3 Mar 2020 17:48:17 +0000 (UTC) Subject: Re: [RFC 2/3] mm/vma: Introduce VM_ACCESS_FLAGS To: Anshuman Khandual , linux-mm@kvack.org References: <1583131666-15531-1-git-send-email-anshuman.khandual@arm.com> <1583131666-15531-3-git-send-email-anshuman.khandual@arm.com> From: Vlastimil Babka Message-ID: <52b4565f-2dab-c3e5-ead8-d76258f43a10@suse.cz> Date: Tue, 3 Mar 2020 18:48:15 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <1583131666-15531-3-git-send-email-anshuman.khandual@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-sh@vger.kernel.org, Catalin Marinas , Dave Hansen , Heiko Carstens , devel@driverdev.osuosl.org, linux-s390@vger.kernel.org, linux-c6x-dev@linux-c6x.org, Yoshinori Sato , Russell King , Ley Foon Tan , Mark Salter , Rob Springer , Thomas Gleixner , Guan Xuetao , linux-arm-kernel@lists.infradead.org, Nick Hu , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, nios2-dev@lists.rocketboards.org, Andrew Morton , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 3/2/20 7:47 AM, Anshuman Khandual wrote: > There are many places where all basic VMA access flags (read, write, exec) > are initialized or checked against as a group. One such example is during > page fault. Existing vma_is_accessible() wrapper already creates the notion > of VMA accessibility as a group access permissions. Hence lets just create > VM_ACCESS_FLAGS (VM_READ|VM_WRITE|VM_EXEC) which will not only reduce code > duplication but also extend the VMA accessibility concept in general. > > Cc: Russell King > CC: Catalin Marinas > CC: Mark Salter > Cc: Nick Hu > CC: Ley Foon Tan > Cc: Michael Ellerman > Cc: Heiko Carstens > Cc: Yoshinori Sato > Cc: Guan Xuetao > Cc: Dave Hansen > Cc: Thomas Gleixner > Cc: Rob Springer > Cc: Greg Kroah-Hartman > Cc: Andrew Morton > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-c6x-dev@linux-c6x.org > Cc: nios2-dev@lists.rocketboards.org > Cc: linuxppc-dev@lists.ozlabs.org > Cc: linux-s390@vger.kernel.org > Cc: linux-sh@vger.kernel.org > Cc: devel@driverdev.osuosl.org > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual Dunno. Such mask seems ok for testing flags, but it's a bit awkward when initializing flags, where it covers just one of many combinations that seem used. But no strong opinions, patch looks correct.