From: Steven Rostedt <rostedt@goodmis.org>
Date: Fri, 29 Feb 2008 17:46:50 +0000 (+0100)
Subject: rcu: add support for dynamic ticks and preempt rcu
X-Git-Tag: v2.6.25-rc4~131^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2232c2d8e0a6a31061dec311f3d1cf7624bc14f1;p=pandora-kernel.git

rcu: add support for dynamic ticks and preempt rcu

The PREEMPT-RCU can get stuck if a CPU goes idle and NO_HZ is set. The
idle CPU will not progress the RCU through its grace period and a
synchronize_rcu my get stuck. Without this patch I have a box that will
not boot when PREEMPT_RCU and NO_HZ are set. That same box boots fine
with this patch.

This patch comes from the -rt kernel where it has been tested for
several months.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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