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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 7 Feb 2019 15:57:05 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x17Fv4Jg58785802 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 7 Feb 2019 15:57:04 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 826AD4C044; Thu, 7 Feb 2019 15:57:04 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1C3454C040; Thu, 7 Feb 2019 15:57:02 +0000 (GMT) Received: from rapoport-lnx (unknown [9.148.8.84]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Thu, 7 Feb 2019 15:57:02 +0000 (GMT) Date: Thu, 7 Feb 2019 17:57:00 +0200 From: Mike Rapoport To: Souptick Joarder Subject: Re: [PATCHv2 1/9] mm: Introduce new vm_insert_range and vm_insert_range_buggy API References: <20190131030812.GA2174@jordon-HP-15-Notebook-PC> <20190131083842.GE28876@rapoport-lnx> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-TM-AS-GCONF: 00 x-cbid: 19020715-4275-0000-0000-0000030CB409 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19020715-4276-0000-0000-0000381ABD69 Message-Id: <20190207155700.GA8040@rapoport-lnx> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-02-07_11:, , 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=763 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902070121 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190207_075719_669072_353C5734 X-CRM114-Status: GOOD ( 25.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michal Hocko , Heiko Stuebner , Peter Zijlstra , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Linux-MM , linux1394-devel@lists.sourceforge.net, Marek Szyprowski , Stephen Rothwell , oleksandr_andrushchenko@epam.com, joro@8bytes.org, Russell King - ARM Linux , Matthew Wilcox , airlied@linux.ie, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, treding@nvidia.com, linux-media@vger.kernel.org, Kees Cook , pawel@osciak.com, Rik van Riel , iommu@lists.linux-foundation.org, rppt@linux.vnet.ibm.com, Boris Ostrovsky , mchehab@kernel.org, iamjoonsoo.kim@lge.com, vbabka@suse.cz, Juergen Gross , hjc@rock-chips.com, xen-devel@lists.xen.org, Kyungmin Park , stefanr@s5r6.in-berlin.de, Andrew Morton , robin.murphy@arm.com, "Kirill A. Shutemov" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Souptick, On Thu, Feb 07, 2019 at 09:19:47PM +0530, Souptick Joarder wrote: > Hi Mike, > > Just thought to take opinion for documentation before placing it in v3. > Does it looks fine ? Overall looks good to me. Several minor points below. > +/** > + * __vm_insert_range - insert range of kernel pages into user vma > + * @vma: user vma to map to > + * @pages: pointer to array of source kernel pages > + * @num: number of pages in page array > + * @offset: user's requested vm_pgoff > + * > + * This allow drivers to insert range of kernel pages into a user vma. allows > + * > + * Return: 0 on success and error code otherwise. > + */ > +static int __vm_insert_range(struct vm_area_struct *vma, struct page **pages, > + unsigned long num, unsigned long offset) > > > +/** > + * vm_insert_range - insert range of kernel pages starts with non zero offset > + * @vma: user vma to map to > + * @pages: pointer to array of source kernel pages > + * @num: number of pages in page array > + * > + * Maps an object consisting of `num' `pages', catering for the user's @num pages > + * requested vm_pgoff > + * > + * If we fail to insert any page into the vma, the function will return > + * immediately leaving any previously inserted pages present. Callers > + * from the mmap handler may immediately return the error as their caller > + * will destroy the vma, removing any successfully inserted pages. Other > + * callers should make their own arrangements for calling unmap_region(). > + * > + * Context: Process context. Called by mmap handlers. > + * Return: 0 on success and error code otherwise. > + */ > +int vm_insert_range(struct vm_area_struct *vma, struct page **pages, > + unsigned long num) > > > +/** > + * vm_insert_range_buggy - insert range of kernel pages starts with zero offset > + * @vma: user vma to map to > + * @pages: pointer to array of source kernel pages > + * @num: number of pages in page array > + * > + * Similar to vm_insert_range(), except that it explicitly sets @vm_pgoff to the offset > + * 0. This function is intended for the drivers that did not consider > + * @vm_pgoff. > + * > + * Context: Process context. Called by mmap handlers. > + * Return: 0 on success and error code otherwise. > + */ > +int vm_insert_range_buggy(struct vm_area_struct *vma, struct page **pages, > + unsigned long num) > -- Sincerely yours, Mike. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel