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

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Date:	Fri, 15 Jul 2016 10:28:25 +1000
From:	Anton Blanchard <anton@...ba.org>
To:	Anna-Maria Gleixner <anna-maria@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.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

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

It reproduces running ppc64le QEMU on a x86-64 box. On Ubuntu:

sudo apt-get install qemu-system-ppc gcc-powerpc64le-linux-gnu

make ARCH=powerpc pseries_le_defconfig

make ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- vmlinux -j4

qemu-system-ppc64 -nographic -vga none -kernel vmlinux 

Anton