From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755605Ab2CDWZy (ORCPT ); Sun, 4 Mar 2012 17:25:54 -0500 Received: from palinux.external.hp.com ([192.25.206.14]:49792 "EHLO mail.parisc-linux.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753793Ab2CDWZx (ORCPT ); Sun, 4 Mar 2012 17:25:53 -0500 X-Greylist: delayed 396 seconds by postgrey-1.27 at vger.kernel.org; Sun, 04 Mar 2012 17:25:53 EST Date: Sun, 4 Mar 2012 15:19:16 -0700 From: Matthew Wilcox To: Linus Torvalds Cc: david@lang.hm, "Ted Ts'o" , Andi Kleen , "H. Peter Anvin" , Linux Kernel Mailing List , linux-fsdevel , Al Viro Subject: Re: Word-at-a-time dcache name accesses (was Re: .. anybody know of any filesystems that depend on the exact VFS 'namehash' implementation?) Message-ID: <20120304221915.GA19570@parisc-linux.org> References: <20120303000203.GH22215@thunk.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 02, 2012 at 04:24:11PM -0800, Linus Torvalds wrote: > Tons of CPU's have efficient char accesses but horrible unaligned word > accesses. Some are even outright buggy (ie at least some ARM cores) > and load crap. Others take a fault. To be fair, that wasn't the ARM core. That was the MEMC chip (roughly equivalent to a northbridge). Also, there's no need for Linux to care about that any more, since we removed the arm26 port in July 2007. As far as I know, all arm32 cores have been coupled with memory controllers that are functional. -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step."