linux-kernel - Re: [PATCH 7/9] rcu: use this_cpu_ptr per-cpu helper instead of per_cpu_ptr(p, raw_smp_processor

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Date:	Thu, 01 Nov 2012 17:09:03 +0800
From:	Shan Wei <shanwei88@...il.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	Christoph Lameter <cl@...ux.com>, dipankar@...ibm.com,
	Kernel-Maillist <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/9] rcu:  use this_cpu_ptr per-cpu helper instead of
 per_cpu_ptr(p, raw_smp_processor_id())

Paul E. McKenney said, at 2012/11/1 4:08:
> 
> One thing to keep in mind -- the only purpose of this is to diffuse
> memory contention.  So there is no need to disable preemption.

same question to me.
Christoph, maybe __this_cpu_read is a better choice which don't disable preemption.

> 
> 							Thanx, Paul
> 
> 

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