linux-kernel - Re: [PATCH 0/4] Unify CPU hotplug lock interface

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Date:	Thu, 29 Aug 2013 11:15:10 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	mingo@...hat.com, hpa@...ux.intel.com, tglx@...utronix.de,
	gregkh@...uxfoundation.org, benh@...nel.crashing.org,
	x86@...nel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, fenghua.yu@...el.com, bp@...e.de,
	srivatsa.bhat@...ux.vnet.ibm.com, isimatu.yasuaki@...fujitsu.com
Subject: Re: [PATCH 0/4] Unify CPU hotplug lock interface

On Sun, 2013-08-18 at 03:02 +0200, Rafael J. Wysocki wrote:
> On Saturday, August 17, 2013 01:46:55 PM Toshi Kani wrote:
> > lock_device_hotplug() was recently introduced to serialize CPU & Memory
> > online/offline and hotplug operations, along with sysfs online interface
> > restructure (commit 4f3549d7).  With this new locking scheme,
> > cpu_hotplug_driver_lock() is redundant and is no longer necessary.
> > 
> > This patchset makes sure that lock_device_hotplug() covers all CPU online/
> > offline interfaces, and then removes cpu_hotplug_driver_lock().
> > 
> > The patchset is based on Linus's tree, 3.11.0-rc5.
> 
> Nice series, thanks a lot for taking care of this!

Hi Rafael,

Per the recent your changes in lock_device_hotplug(), do you think it
makes sense to integrate this patchset into your tree?  I am also
considering to add one more patch to use lock_device_hotplug_sysfs() in
cpu_probe_store().  I will rebase to your tree and send them today if it
makes sense to you.

Thanks,
-Toshi


> 
> Rafael
> 
> 
> > ---
> > Toshi Kani (4):
> >   hotplug, x86: Fix online state in cpu0 debug interface
> >   hotplug, x86: Add hotplug lock to missing places
> >   hotplug, x86: Disable ARCH_CPU_PROBE_RELEASE on x86
> >   hotplug, powerpc, x86: Remove cpu_hotplug_driver_lock()
> > 
> > ---
> >  arch/powerpc/kernel/smp.c              | 12 ----------
> >  arch/powerpc/platforms/pseries/dlpar.c | 40 +++++++++++++---------------------
> >  arch/x86/Kconfig                       |  4 ----
> >  arch/x86/kernel/smpboot.c              | 21 ------------------
> >  arch/x86/kernel/topology.c             | 11 ++++++----
> >  drivers/base/cpu.c                     | 26 ++++++++++++----------
> >  include/linux/cpu.h                    | 13 -----------
> >  7 files changed, 37 insertions(+), 90 deletions(-)
> > --
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