linux-kernel - Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine

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Message-ID: <20160715162045.GE16938@linutronix.de>
Date:	Fri, 15 Jul 2016 18:20:45 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Anton Blanchard <anton@...ba.org>
Cc:	Anna-Maria Gleixner <anna-maria@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>, rt@...utronix.de,
	Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Christophe Jaillet <christophe.jaillet@...adoo.fr>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine

* Anton Blanchard | 2016-07-15 10:28:25 [+1000]:

>Hi Anna-Maria,
Hi Anton,

>> >> Install the callbacks via the state machine and let the core invoke
>> >> the callbacks on the already online CPUs.  
>> >
>> > This is causing an oops on ppc64le QEMU, looks like a NULL
>> > pointer:  
>> 
>> Did you tested it against tip WIP.hotplug?
>
>I noticed tip started failing in my CI environment which tests on QEMU.
>The failure bisected to commit 425209e0abaf2c6e3a90ce4fedb935c10652bf80
>
>It reproduces running ppc64le QEMU on a x86-64 box. On Ubuntu:
…

Thanks for that. I can reproduce this ontop of latest WIP.hotplug with
this patch.

>Anton

Sebastian