linux-kernel - Re: [PATCH 2/4] hotplug, x86: Add hotplug lock to missing places

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Message-ID: <1376924024.10300.450.camel@misato.fc.hp.com>
Date:	Mon, 19 Aug 2013 08:53:44 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	mingo@...hat.com, hpa@...ux.intel.com, tglx@...utronix.de,
	benh@...nel.crashing.org, x86@...nel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	rjw@...k.pl, fenghua.yu@...el.com, bp@...e.de,
	srivatsa.bhat@...ux.vnet.ibm.com, isimatu.yasuaki@...fujitsu.com
Subject: Re: [PATCH 2/4] hotplug, x86: Add hotplug lock to missing places

On Sat, 2013-08-17 at 16:15 -0700, Greg KH wrote:
> On Sat, Aug 17, 2013 at 01:46:57PM -0600, Toshi Kani wrote:
> > lock_device_hotplug() serializes CPU & Memory online/offline and hotplug
> > operations.  However, this lock is not held in the debug interfaces below
> > that initiate CPU online/offline operations.
> > 
> >  - _debug_hotplug_cpu(), cpu0 hotplug test interface enabled by
> >    CONFIG_DEBUG_HOTPLUG_CPU0.
> >  - cpu_probe_store() and cpu_release_store(), cpu hotplug test interface
> >    enabled by CONFIG_ARCH_CPU_PROBE_RELEASE.
> > 
> > This patch changes the above interfaces to hold lock_device_hotplug().
> > 
> > Signed-off-by: Toshi Kani <toshi.kani@...com>
> > ---
> >  arch/x86/kernel/topology.c |    2 ++
> >  drivers/base/cpu.c         |   16 ++++++++++++++--
> >  2 files changed, 16 insertions(+), 2 deletions(-)
> 
> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Thanks Greg!
-Toshi



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