From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753520Ab1GND0a (ORCPT ); Wed, 13 Jul 2011 23:26:30 -0400 Received: from mail-iw0-f174.google.com ([209.85.214.174]:45958 "EHLO mail-iw0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753410Ab1GND03 (ORCPT ); Wed, 13 Jul 2011 23:26:29 -0400 Message-ID: <4E1E61AD.4000707@vflare.org> Date: Wed, 13 Jul 2011 20:25:33 -0700 From: Nitin Gupta User-Agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:5.0) Gecko/20110624 Thunderbird/5.0 MIME-Version: 1.0 To: Jerome Marchand CC: Greg Kroah-Hartman , Linux Kernel List , Robert Jennings , Jeff Moyer Subject: Re: [PATCH 3/4] Staging: zram: allow partial page operations References: <1307712529-9757-1-git-send-email-jmarchan@redhat.com> <1307712529-9757-2-git-send-email-jmarchan@redhat.com> <1307712529-9757-3-git-send-email-jmarchan@redhat.com> In-Reply-To: <1307712529-9757-3-git-send-email-jmarchan@redhat.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/10/2011 06:28 AM, Jerome Marchand wrote: > Commit 7b19b8d45b216ff3186f066b31937bdbde066f08 (zram: Prevent overflow > in logical block size) introduced ZRAM_LOGICAL_BLOCK_SIZE constant to > prevent overflow of logical block size on 64k page kernel. > However, the current implementation of zram only allow operation on block > of the same size as a page. That makes theorically legit 4k requests fail > on 64k page kernel. > > This patch makes zram allow operation on partial pages. Basically, it > means we still do operations on full pages internally, but only copy the > relevent segments from/to the user memory. > > Signed-off-by: Jerome Marchand Acked-by: Nitin Gupta