From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752269Ab2A0RQq (ORCPT ); Fri, 27 Jan 2012 12:16:46 -0500 Received: from perches-mx.perches.com ([206.117.179.246]:58630 "EHLO labridge.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751881Ab2A0RQp (ORCPT ); Fri, 27 Jan 2012 12:16:45 -0500 Message-ID: <1327684589.12089.22.camel@joe2Laptop> Subject: Re: [PATCH] mtd/nand: use string library From: Joe Perches To: Akinobu Mita Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Jiandong Zheng , Scott Branden , David Woodhouse , linux-mtd@lists.infradead.org Date: Fri, 27 Jan 2012 09:16:29 -0800 In-Reply-To: <1327674295-3700-2-git-send-email-akinobu.mita@gmail.com> References: <1327674295-3700-1-git-send-email-akinobu.mita@gmail.com> <1327674295-3700-2-git-send-email-akinobu.mita@gmail.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.2- Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2012-01-27 at 23:24 +0900, Akinobu Mita wrote: > - Use memchr_inv to check if the data contains all 0xFF bytes. > It is faster than looping for each byte. Stupid question: Are there any mtd devices modified that are slower at 64 bit accesses than repeated 8 bit accesses?