From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750805AbWF2Pg0 (ORCPT ); Thu, 29 Jun 2006 11:36:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750807AbWF2Pg0 (ORCPT ); Thu, 29 Jun 2006 11:36:26 -0400 Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:8400 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S1750805AbWF2PgZ (ORCPT ); Thu, 29 Jun 2006 11:36:25 -0400 Subject: Re: [PATCH] (Longhaul 1/5) PCI: Protect bus master DMA from Longhaul by rw semaphores From: Alan Cox To: Bart Hartgers Cc: =?UTF-8?Q?Rafa=C5=82?= Bilski , Greg Kroah-Hartman , linux-kernel@vger.kernel.org In-Reply-To: <44A3C17F.3060204@etpmod.phys.tue.nl> References: <44A2C9A7.6060703@interia.pl> <1151581077.23785.9.camel@localhost.localdomain> <44A3C17F.3060204@etpmod.phys.tue.nl> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Thu, 29 Jun 2006 16:52:28 +0100 Message-Id: <1151596348.23785.34.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.6.2 (2.6.2-1.fc5.5) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Ar Iau, 2006-06-29 am 14:03 +0200, ysgrifennodd Bart Hartgers: > > "snooping". So we do need the cache sorting out. > > > > If I understand correctly, trouble occurs when the processor tries to > snoop? Would disabling (via MSR) and flushing the caches before changing > the frequency help in that case? I would think so. Some other processors have similar requirements for deep sleeping. Alan