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

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Date:	Sat, 17 Aug 2013 16:15:52 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Toshi Kani <toshi.kani@...com>
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, 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>
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