Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752336Ab0LQCzG (ORCPT ); Thu, 16 Dec 2010 21:55:06 -0500 Received: from vms173013pub.verizon.net ([206.46.173.13]:36942 "EHLO vms173013pub.verizon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751114Ab0LQCzF (ORCPT ); Thu, 16 Dec 2010 21:55:05 -0500 Date: Thu, 16 Dec 2010 21:54:44 -0500 (EST) From: Len Brown X-X-Sender: lenb@x980 To: Jack Steiner Cc: hpa@zytor.com, Henrique de Moraes Holschuh , tony.luck@gmail.com, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, gbeshers@sgi.com Subject: Re: [PATCH] - Mapping ACPI tables as CACHED In-reply-to: Message-id: References: <20101214220932.GA1206@sgi.com> <20101215024136.GB19601@sgi.com> <20101215164635.GA27373@sgi.com> User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) MIME-version: 1.0 Content-type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 737 Lines: 22 > I'll bet we can improve the boot sequence so that > some of the stuff we do before we have cached mappings > we can do with cached mappings... Nope, that is a losing bet... The early mappings are temporary, but they are cached, for they use __pgprot(__PAGE_KERNEL_IO), which is (__PAGE_KERNEL | _PAGE_IOMAP) rather than __pgprot(__PAGE_KERNEL_IO_NOCACHE) or its variants. We just need to update the permanent mappings to match. cheers, Len Brown, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/