From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757343Ab0GNP13 (ORCPT ); Wed, 14 Jul 2010 11:27:29 -0400 Received: from www.tglx.de ([62.245.132.106]:47301 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757227Ab0GNP11 (ORCPT ); Wed, 14 Jul 2010 11:27:27 -0400 Date: Wed, 14 Jul 2010 17:27:01 +0200 (CEST) From: Thomas Gleixner To: Christoph Hellwig cc: Ingo Molnar , mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org, rostedt@goodmis.org Subject: Re: [tip:x86/irq] x86: Always use irq stacks In-Reply-To: <20100714151215.GA31825@lst.de> Message-ID: References: <20100628121554.GA6605@lst.de> <20100630074434.GA25509@elte.hu> <20100630075212.GA24658@lst.de> <20100630075818.GB25509@elte.hu> <20100630080453.GA14371@elte.hu> <20100708204251.GA13569@elte.hu> <20100708205302.GA23961@lst.de> <20100714151215.GA31825@lst.de> 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 On Wed, 14 Jul 2010, Christoph Hellwig wrote: > Turns out this wasn't a regression introduced by a commit, but it > happens when CONFIG_FUNCTION_GRAPH_TRACER is enabled. From a quick > look I have no idea why these would interact badly, especially as > CONFIG_FUNCTION_GRAPH_TRACER works fine with irq stacks if the > CONFIG_4KSTACKS options is set. So you're saying, that the problem appears when CONFIG_FUNCTION_GRAPH_TRACER is enabled w/o being used and that it exists prior to your patches with irq stacks and 8k stack size, but works with 4k stacks. That's definitely more than odd. Thanks, tglx