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

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Date:	Fri, 15 Jul 2016 10:43:24 +0200
From:	Ingo Molnar <mingo@...nel.org>
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>,
	Thomas Gleixner <tglx@...utronix.de>, rt@...utronix.de,
	Sebastian Andrzej Siewior <bigeasy@...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 <anton@...ba.org> wrote:

> Hi Anna-Maria,
> 
> > >> 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

That's very useful, thanks Anton!

I have removed this commit from the series for the time being, refactored the 
followup commits (there was one trivial conflict). We can re-try this patch when a 
fix is found.

Thanks,

	Ingo