From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751109Ab2KPISM (ORCPT ); Fri, 16 Nov 2012 03:18:12 -0500 Received: from moutng.kundenserver.de ([212.227.126.187]:59225 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750730Ab2KPISK (ORCPT ); Fri, 16 Nov 2012 03:18:10 -0500 From: Arnd Bergmann To: Rob Clark Subject: Re: [PATCH] ARM: add get_user() support for 8 byte types Date: Fri, 16 Nov 2012 08:18:01 +0000 User-Agent: KMail/1.12.2 (Linux/3.5.0; KDE/4.3.2; x86_64; ; ) Cc: linux-arm-kernel@lists.infradead.org, patches@linaro.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, dri-devel@lists.freedesktop.org, Russell King , Rob Clark References: <1353016879-15007-1-git-send-email-rob.clark@linaro.org> In-Reply-To: <1353016879-15007-1-git-send-email-rob.clark@linaro.org> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Message-Id: <201211160818.01302.arnd@arndb.de> X-Provags-ID: V02:K0:QNE9+qU00XaqCxjTFbzOamldKZTj1GTm0tfSULVqCZ0 HUTXQFsSjFLFU7IQm80NiFiYP2V7mDdUbhzvFUCj2zSZPkedyN BJUZPqfhWe7eks4fHtj7ro4QH06Sm+ZJ9Xqpk9g2XuNL/b6Igr 5NuqsF6hMeXTAc1cEfKdrr5oy5mVMLWwMPlbuuK08X58UcgbrY nwz08HvEg5jYKJn7A/8f0yF8SYkH4br2nwP3eER+9lPjwxazo8 OlOUeIlcyTbmVtiscP16L7tKHpliicXt8h+6YJCIDrGBrWzZH/ 8museAw5f+Cp+pTyRDyBtGDZaAdNabRKn6ed1srxwrb/paM6rj 2Jo/8/8YI3IEG9oFu5Yc= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thursday 15 November 2012, Rob Clark wrote: > > From: Rob Clark > > A new atomic modeset/pageflip ioctl being developed in DRM requires > get_user() to work for 64bit types (in addition to just put_user()). > > v1: original > v2: pass correct size to check_uaccess, and better handling of narrowing > double word read with __get_user_xb() (Russell King's suggestion) > v3: explain in comment about why this works for narrowing fetch to 1, > 2, or 4 byte type on ARM. > > Signed-off-by: Rob Clark Acked-by: Arnd Bergmann