Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754450AbaAFLct (ORCPT ); Mon, 6 Jan 2014 06:32:49 -0500 Received: from www.linutronix.de ([62.245.132.108]:51446 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753933AbaAFLcs (ORCPT ); Mon, 6 Jan 2014 06:32:48 -0500 Date: Mon, 6 Jan 2014 12:32:30 +0100 From: Sebastian Andrzej Siewior To: Andi Kleen Cc: Ben Hutchings , Thomas Gleixner , Peter Zijlstra , Steven Rostedt , 723180@bugs.debian.org, Brian Silverman , LKML , linux-rt-users@vger.kernel.org Subject: Re: [PATCH] Revert "x86: Disable IST stacks for debug/int 3/stack fault for PREEMPT_RT" Message-ID: <20140106113230.GA25261@linutronix.de> References: <20130917061329.4872.51468.reportbug@dell-inspiron-linux.dlinkrouter> <1379427451.23881.48.camel@deadeye.wl.decadent.org.uk> <1379905562.3913.8.camel@deadeye.wl.decadent.org.uk> <1380115449.4430.21.camel@deadeye.wl.decadent.org.uk> <52AE0419.3050103@linutronix.de> <20140103135548.GA6327@linutronix.de> <20140104181807.GS20765@two.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20140104181807.GS20765@two.firstfloor.org> X-Key-Id: 97C4700B X-Key-Fingerprint: 09E2 D1F3 9A3A FF13 C3D3 961C 0688 1C1E 97C4 700B User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Andi Kleen | 2014-01-04 19:18:07 [+0100]: >On Fri, Jan 03, 2014 at 02:55:48PM +0100, Sebastian Andrzej Siewior wrote: >> where do I start. Let me explain what is going on here. The code >> sequence > >Yes the IST stacks are needed for correctness, even in more cases than >the example below. You cannot just disable them, just because you don't >like them. Andi, you were the Author of that patch. I plan to migrate from the IST stack to the kernel stack so I can enable preemption. This is he case on 32bit. You mention more cases than this. Could you please give me some examples so I can consider them? >-Andi Sebastian -- 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/