linux-kernel - Re: [PATCH v2 25/45] staging/octeon: Use get/put_online_cpus

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Date:	Tue, 25 Jun 2013 13:45:31 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
	oleg@...hat.com, paulmck@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
	mingo@...nel.org, akpm@...ux-foundation.org, namhyung@...nel.org,
	walken@...gle.com, vincent.guittot@...aro.org,
	laijs@...fujitsu.com, rostedt@...dmis.org,
	wangyun@...ux.vnet.ibm.com, xiaoguangrong@...ux.vnet.ibm.com,
	sbw@....edu, fweisbec@...il.com, zhong@...ux.vnet.ibm.com,
	nikunj@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	devel@...verdev.osuosl.org, David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v2 25/45] staging/octeon: Use
 get/put_online_cpus_atomic() to prevent CPU offline

On Wed, Jun 26, 2013 at 02:00:04AM +0530, Srivatsa S. Bhat wrote:
> Once stop_machine() is gone from the CPU offline path, we won't be able
> to depend on disabling preemption to prevent CPUs from going offline
> from under us.
> 
> Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going
> offline, while invoking from atomic context.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: devel@...verdev.osuosl.org
> Acked-by: David Daney <david.daney@...ium.com>
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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