From: Antti P Miettinen <ananaza@iki.fi>
Date: Fri, 5 Oct 2012 06:59:15 +0000 (+0300)
Subject: rcu: Add a module parameter to force use of expedited RCU primitives
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~79^2^2~4^7~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3705b88db0d7cc4a097c32d9e554054103d3f807;p=pandora-kernel.git

rcu: Add a module parameter to force use of expedited RCU primitives

There have been some embedded applications that would benefit from
use of expedited grace-period primitives.  In some ways, this is
similar to synchronize_net() doing either a normal or an expedited
grace period depending on lock state, but with control outside of
the kernel.

This commit therefore adds rcu_expedited boot and sysfs parameters
that cause the kernel to substitute expedited primitives for the
normal grace-period primitives.

[ paulmck: Add trace/event/rcu.h to kernel/srcu.c to avoid build error.
	   Get rid of infinite loop through contention path.]

Signed-off-by: Antti P Miettinen <amiettinen@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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