From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763743AbYD0WTH (ORCPT ); Sun, 27 Apr 2008 18:19:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751936AbYD0WSz (ORCPT ); Sun, 27 Apr 2008 18:18:55 -0400 Received: from accolon.hansenpartnership.com ([76.243.235.52]:59946 "EHLO accolon.hansenpartnership.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751447AbYD0WSy (ORCPT ); Sun, 27 Apr 2008 18:18:54 -0400 Subject: Re: Breakage caused by unreviewed patch in x86 tree From: James Bottomley To: "H. Peter Anvin" Cc: Ingo Molnar , Thomas Gleixner , linux-kernel In-Reply-To: <4814FAA0.8060705@zytor.com> References: <1209329485.3801.46.camel@localhost.localdomain> <4814F76B.8030505@zytor.com> <1209334212.3801.70.camel@localhost.localdomain> <4814FAA0.8060705@zytor.com> Content-Type: text/plain Date: Sun, 27 Apr 2008 18:18:49 -0400 Message-Id: <1209334729.3801.75.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.12.3 (2.12.3-4.fc8) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2008-04-27 at 15:13 -0700, H. Peter Anvin wrote: > James Bottomley wrote: > > On Sun, 2008-04-27 at 15:00 -0700, H. Peter Anvin wrote: > >> James Bottomley wrote: > >>> I might add that the intel SAPIC functions > >>> in roughly the same manner, so this might break more than just voyager. > >> Are you referring to the IA64 SAPIC here, or something else? The only > >> mention of SAPIC in the x86 tree appear to be naming of fields in ACPI > >> tables. > > > > Yes, that's the one ... but I believe a class of the xAPICs also used a > > similar principle. > > I certainly have never seen a system on which the APIC has been mapped > cacheable. I would be very interested in the details, so if you could > elaborate that would be extremely useful. Not really ... I just remember when the SAPIC and later the xAPIC details were published as novel nearly a decade ago, I remember saying that some of the voyager interrupt controllers had been using a similar method for years. James