From: Dipankar Sarma <dipankar@in.ibm.com>
Date: Fri, 25 Jan 2008 20:08:23 +0000 (+0100)
Subject: Preempt-RCU: Use softirq instead of tasklets for
X-Git-Tag: v2.6.25-rc1~1237^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c2d727aa2ff17a1c8e5ed1e5e231bb8579b27e82;p=pandora-kernel.git

Preempt-RCU: Use softirq instead of tasklets for

This patch makes RCU use softirq instead of tasklets.

It also adds a memory barrier after raising the softirq
inorder to ensure that the cpu sees the most recently updated
value of rcu->cur while processing callbacks.
The discussion of the related theoretical race pointed out
by James Huang can be found here --> http://lkml.org/lkml/2007/11/20/603

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Reviewed-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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