linux-kernel - Re: [PATCH] s390/cpum_sf: Remove superfluous SMP function call

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Date:	Tue, 5 Apr 2016 14:19:23 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	rcochran@...utronix.de,
	Anna-Maria Gleixner <anna-maria@...utronix.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	rt@...utronix.de
Subject: Re: [PATCH] s390/cpum_sf: Remove superfluous SMP function call

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