Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750996AbWCHMeq (ORCPT ); Wed, 8 Mar 2006 07:34:46 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750939AbWCHMeq (ORCPT ); Wed, 8 Mar 2006 07:34:46 -0500 Received: from mx1.redhat.com ([66.187.233.31]:61396 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S1750779AbWCHMep (ORCPT ); Wed, 8 Mar 2006 07:34:45 -0500 From: David Howells In-Reply-To: References: <31492.1141753245@warthog.cambridge.redhat.com> <17422.19209.60360.178668@cargo.ozlabs.ibm.com> To: Linus Torvalds Cc: Paul Mackerras , David Howells , akpm@osdl.org, mingo@redhat.com, linux-arch@vger.kernel.org, linuxppc64-dev@ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] Document Linux's memory barriers X-Mailer: MH-E 7.92+cvs; nmh 1.1; GNU Emacs 22.0.50.4 Date: Wed, 08 Mar 2006 12:34:25 +0000 Message-ID: <27607.1141821265@warthog.cambridge.redhat.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 582 Lines: 15 Linus Torvalds wrote: > > Linus explained recently that wmb() on x86 does not order stores to > > system memory w.r.t. stores to stores to prefetchable I/O memory (at > > least that's what I think he said ;). On i386 and x86_64, do IN and OUT instructions imply MFENCE? It's not obvious from the x86_64 docs. David - 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/