From: Lai Jiangshan <laijs@cn.fujitsu.com>
Date: Mon, 28 Jun 2010 08:25:04 +0000 (+0800)
Subject: rcu: simplify the usage of percpu data
X-Git-Tag: v2.6.37-rc1~215^2~14^2~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=394f99a9007d4274f7076bb8553ab0ff9707688b;p=pandora-kernel.git

rcu: simplify the usage of percpu data

&percpu_data is compatible with allocated percpu data.

And we use it and remove the "->rda[NR_CPUS]" array, saving significant
storage on systems with large numbers of CPUs.  This does add an additional
level of indirection and thus an additional cache line referenced, but
because ->rda is not used on the read side, this is OK.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
---

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