linux-kernel - Re: [PATCH v2 4/4] hotplug, powerpc, x86: Remove cpu_hotplug_driver

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Date:	Wed, 25 Sep 2013 14:44:59 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...ux.intel.com" <hpa@...ux.intel.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nfont@...ux.vnet.ibm.com" <nfont@...ux.vnet.ibm.com>,
	"fenghua.yu@...el.com" <fenghua.yu@...el.com>,
	"bp@...e.de" <bp@...e.de>,
	"srivatsa.bhat@...ux.vnet.ibm.com" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"isimatu.yasuaki@...fujitsu.com" <isimatu.yasuaki@...fujitsu.com>
Subject: Re: [PATCH v2 4/4] hotplug, powerpc, x86: Remove
 cpu_hotplug_driver_lock()

On Wed, 2013-09-25 at 08:27 +0000, Rafael J. Wysocki wrote:
> Hi,
> 
> On Thursday, August 29, 2013 06:22:09 PM Toshi Kani wrote:
> > cpu_hotplug_driver_lock() serializes CPU online/offline operations
> > when ARCH_CPU_PROBE_RELEASE is set.  This lock interface is no longer
> > necessary with the following reason:
> > 
> >  - lock_device_hotplug() now protects CPU online/offline operations,
> >    including the probe & release interfaces enabled by
> >    ARCH_CPU_PROBE_RELEASE.  The use of cpu_hotplug_driver_lock() is
> >    redundant.
> >  - cpu_hotplug_driver_lock() is only valid when ARCH_CPU_PROBE_RELEASE
> >    is defined, which is misleading and is only enabled on powerpc.
> > 
> > This patch removes the cpu_hotplug_driver_lock() interface.  As
> > a result, ARCH_CPU_PROBE_RELEASE only enables / disables the cpu
> > probe & release interface as intended.  There is no functional change
> > in this patch.
> > 
> > Signed-off-by: Toshi Kani <toshi.kani@...com>
> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Reviewed-by: Nathan Fontenot <nfont@...ux.vnet.ibm.com>
> 
> Can you please rebase this patch on top of 3.12-rc2?  It doesn't apply for
> me any more.

Yes, I will send this patch on top of 3.12-rc2.

Thanks,
-Toshi

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