From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date: Sun, 20 Sep 2009 15:39:30 +0000 (-0400)
Subject: urcu-defer: Add fast path for empty queues
X-Git-Tag: v0.1~61
X-Git-Url: http://git.liburcu.org/?p=urcu.git;a=commitdiff_plain;h=0d0e6c21fbf509aebecd5f1c5cbac43a0dc69f6d;hp=0d0e6c21fbf509aebecd5f1c5cbac43a0dc69f6d

urcu-defer: Add fast path for empty queues

defer_barrier does not need to call synchronize_rcu() when all queues are empty.
Skip the G.P. if this is the case.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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