linux-kernel - Re: [PATCH] cpu/hotplug: fix rollback during error-out in __cpu

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Date:	Thu, 7 Apr 2016 17:14:00 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org, rt@...utronix.de,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Anna-Maria Gleixner <anna-maria@...utronix.de>
Subject: Re: [PATCH] cpu/hotplug: fix rollback during error-out in
 __cpu_disable()

On 04/06/2016 09:51 PM, Heiko Carstens wrote:
> This fixes the issue that a second cpu_down() will take forever, if
> __cpu_disable() fails.

Yes. But even without the second take down your CPU isn't complete up.

> However it does not fix the issue that CPU_DOWN_FAILED will be seen on a
> different cpu than the cpu that was supposed to be taken offline.

This is correct. It fixes only the regression you reported.
The CPU_DOWN_FAILED patches are on hold for now.

Sebastian