linux-kernel - Re: [PATCH 2/3 RFC paul/rcu/srcu] srcu: only increase the upper bit for srcu_read

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Message-ID: <1329904253.24994.1.camel@twins>
Date:	Wed, 22 Feb 2012 10:50:53 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	mingo@...e.hu, dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	patches@...aro.org
Subject: Re: [PATCH 2/3 RFC paul/rcu/srcu] srcu: only increase the upper bit
 for srcu_read_lock()

On Wed, 2012-02-22 at 17:29 +0800, Lai Jiangshan wrote:
> +       ACCESS_ONCE(this_cpu_ptr(sp->per_cpu_ref)->c[idx]) += -1;

That just looks funny.. 
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