linux-kernel - Re: [PATCH] Revert "x86: Disable IST stacks for debug/int 3/stack fault for PREEMPT

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Message-ID: <20140104181807.GS20765@two.firstfloor.org>
Date:	Sat, 4 Jan 2014 19:18:07 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Ben Hutchings <ben@...adent.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...tedt.homelinux.com>,
	723180@...s.debian.org, Brian Silverman <bsilver16384@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users@...r.kernel.org, Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] Revert "x86: Disable IST stacks for debug/int 3/stack
 fault for PREEMPT_RT"

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
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