From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Subject: Re: [PATCH] ARM: add get_user() support for 8 byte types Date: Fri, 16 Nov 2012 08:18:01 +0000 Message-ID: <201211160818.01302.arnd@arndb.de> References: <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 Return-path: 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 In-Reply-To: <1353016879-15007-1-git-send-email-rob.clark@linaro.org> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Rob Clark 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 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 From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Fri, 16 Nov 2012 08:18:01 +0000 Subject: [PATCH] ARM: add get_user() support for 8 byte types In-Reply-To: <1353016879-15007-1-git-send-email-rob.clark@linaro.org> References: <1353016879-15007-1-git-send-email-rob.clark@linaro.org> Message-ID: <201211160818.01302.arnd@arndb.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.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