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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,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 24A71C43441 for ; Mon, 19 Nov 2018 16:27:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DD09120831 for ; Mon, 19 Nov 2018 16:27:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DD09120831 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com 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 S1730139AbeKTCvE (ORCPT ); Mon, 19 Nov 2018 21:51:04 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:47822 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729974AbeKTCvD (ORCPT ); Mon, 19 Nov 2018 21:51:03 -0500 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id wAJGJbJU182975 for ; Mon, 19 Nov 2018 11:26:57 -0500 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0b-001b2d01.pphosted.com with ESMTP id 2nuypek2y7-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 19 Nov 2018 11:26:56 -0500 Received: from localhost by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 19 Nov 2018 16:26:43 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wAJGQgVV55508996 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 19 Nov 2018 16:26:42 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5E05AA4060; Mon, 19 Nov 2018 16:26:42 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4CB8DA4064; Mon, 19 Nov 2018 16:26:29 +0000 (GMT) Received: from rapoport-lnx (unknown [9.148.205.9]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Mon, 19 Nov 2018 16:26:28 +0000 (GMT) Date: Mon, 19 Nov 2018 08:26:24 -0800 From: Mike Rapoport To: Souptick Joarder Cc: Matthew Wilcox , Andrew Morton , Michal Hocko , "Kirill A. Shutemov" , vbabka@suse.cz, Rik van Riel , Stephen Rothwell , rppt@linux.vnet.ibm.com, Peter Zijlstra , Russell King - ARM Linux , robin.murphy@arm.com, iamjoonsoo.kim@lge.com, treding@nvidia.com, Kees Cook , Marek Szyprowski , stefanr@s5r6.in-berlin.de, hjc@rock-chips.com, Heiko Stuebner , airlied@linux.ie, oleksandr_andrushchenko@epam.com, joro@8bytes.org, pawel@osciak.com, Kyungmin Park , mchehab@kernel.org, Boris Ostrovsky , Juergen Gross , linux-kernel@vger.kernel.org, Linux-MM , linux-arm-kernel@lists.infradead.org, linux1394-devel@lists.sourceforge.net, dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, xen-devel@lists.xen.org, iommu@lists.linux-foundation.org, linux-media@vger.kernel.org Subject: Re: [PATCH 1/9] mm: Introduce new vm_insert_range API References: <20181115154530.GA27872@jordon-HP-15-Notebook-PC> <20181116182836.GB17088@rapoport-lnx> <20181117143742.GB7861@bombadil.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-TM-AS-GCONF: 00 x-cbid: 18111916-0020-0000-0000-000002EA5729 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18111916-0021-0000-0000-0000213984C7 Message-Id: <20181119162623.GA13200@rapoport-lnx> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-11-19_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1811190150 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 19, 2018 at 08:43:09PM +0530, Souptick Joarder wrote: > Hi Mike, > > On Sat, Nov 17, 2018 at 8:07 PM Matthew Wilcox wrote: > > > > On Sat, Nov 17, 2018 at 12:26:38PM +0530, Souptick Joarder wrote: > > > On Fri, Nov 16, 2018 at 11:59 PM Mike Rapoport wrote: > > > > > + * vm_insert_range - insert range of kernel pages into user vma > > > > > + * @vma: user vma to map to > > > > > + * @addr: target user address of this page > > > > > + * @pages: pointer to array of source kernel pages > > > > > + * @page_count: no. of pages need to insert into user vma > > > > > + * > > > > > + * This allows drivers to insert range of kernel pages they've allocated > > > > > + * into a user vma. This is a generic function which drivers can use > > > > > + * rather than using their own way of mapping range of kernel pages into > > > > > + * user vma. > > > > > > > > Please add the return value and context descriptions. > > > > > > > > > > Sure I will wait for some time to get additional review comments and > > > add all of those requested changes in v2. > > > > You could send your proposed wording now which might remove the need > > for a v3 if we end up arguing about the wording. > > Does this description looks good ? > > /** > * vm_insert_range - insert range of kernel pages into user vma > * @vma: user vma to map to > * @addr: target user address of this page > * @pages: pointer to array of source kernel pages > * @page_count: number of pages need to insert into user vma > * > * This allows drivers to insert range of kernel pages they've allocated > * into a user vma. This is a generic function which drivers can use > * rather than using their own way of mapping range of kernel pages into > * user vma. > * > * Context - Process context. Called by mmap handlers. Context: > * Return - int error value Return: > * 0 - OK > * -EINVAL - Invalid argument > * -ENOMEM - No memory > * -EFAULT - Bad address > * -EBUSY - Device or resource busy I don't think that elaborate description of error values is needed, just "0 on success and error code otherwise" would be sufficient. > */ > -- Sincerely yours, Mike.