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Date:	Sat, 4 Jan 2014 19:18:07 +0100
From:	Andi Kleen <>
To:	Sebastian Andrzej Siewior <>
Cc:	Ben Hutchings <>,
	Thomas Gleixner <>,
	Peter Zijlstra <>,
	Steven Rostedt <>,, Brian Silverman <>,
	LKML <>,, Andi Kleen <>
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.

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