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Subject: Re: [PATCH] s390/cpum_sf: Remove superfluous SMP function call
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Tue, 5 Apr 2016 14:19:23 +0200
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To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: rcochran@linutronix.de, Anna-Maria Gleixner <anna-maria@linutronix.de>, Martin Schwidefsky <schwidefsky@de.ibm.com>, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, rt@linutronix.de
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On 04/05/2016 02:11 PM, Heiko Carstens wrote:
> I think there is more broken: if I willingly let __cpu_disable() fail and
> try to offline e.g. cpu 2 for the second time chcpu will never return.
> Plus the console contains several "NOHZ: local_softirq_pending 01"
> messages.

…
> 
> All of this works without problems on vanilla 4.5 kernel.
> 
> I think you can reproduce this on any architecture :)

oh yes.

Sebastian