From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755146AbYECWbq (ORCPT ); Sat, 3 May 2008 18:31:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752176AbYECWbi (ORCPT ); Sat, 3 May 2008 18:31:38 -0400 Received: from gate.crashing.org ([63.228.1.57]:34538 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751385AbYECWbh (ORCPT ); Sat, 3 May 2008 18:31:37 -0400 Subject: Re: 'global' rq->clock From: Benjamin Herrenschmidt Reply-To: benh@kernel.crashing.org To: David Miller Cc: mingo@elte.hu, a.p.zijlstra@chello.nl, efault@gmx.de, elendil@planet.nl, parag.warudkar@gmail.com, linux-kernel@vger.kernel.org, guichaz@yahoo.fr, andi@firstfloor.org In-Reply-To: <20080503.122734.01023096.davem@davemloft.net> References: <20080503082849.GA29605@elte.hu> <20080503.020502.226847930.davem@davemloft.net> <20080503101016.GA18801@elte.hu> <20080503.122734.01023096.davem@davemloft.net> Content-Type: text/plain Date: Sun, 04 May 2008 08:30:55 +1000 Message-Id: <1209853855.26383.28.camel@pasglop> Mime-Version: 1.0 X-Mailer: Evolution 2.12.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2008-05-03 at 12:27 -0700, David Miller wrote: > > ( although please note that the growing generalization that goes on > > _did_ find a subtle nohz problem on sparc64 early in the merge > window, > > so it's not like these changes are totally useless to you. ) > > Note that this bug theoretically exists on every platform, > even x86, and only sparc64 is fixed at the moment by adding > the irq_{entry,exit}() guards around all of it's IPI handlers. What is the bug ? IPIs on power are normal interrupts, so they do happen in irq_entry/exit blocks but I'm curious to know what the root bug is :-) Ben.