From: jbaron@redhat.com <jbaron@redhat.com>
Date: Fri, 22 Aug 2008 14:04:45 -0400
Subject: [misc] markers and tracepoints: rcu-read patch
Message-id: 1219428298-7519-2-git-send-email-jbaron@redhat.com
O-Subject: [rhel5.3 patch 01/14] markers and tracepoints - rcu-read patch
Bugzilla: 329821

bz# 329821

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index b4ca73d..47eaef1 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -219,6 +219,26 @@ extern int rcu_needs_cpu(int cpu);
 	} while(0)
 
 /**
+ * rcu_read_lock_sched - mark the beginning of a RCU-classic critical section
+ *
+ * Should be used with either
+ * - synchronize_sched()
+ * or
+ * - call_rcu_sched() and rcu_barrier_sched()
+ * on the write-side to insure proper synchronization.
+ */
+#define rcu_read_lock_sched() preempt_disable()
+
+/*
+ * rcu_read_unlock_sched - marks the end of a RCU-classic critical section
+ *
+ * See rcu_read_lock_sched for more information.
+ */
+#define rcu_read_unlock_sched() preempt_enable()
+
+
+
+/**
  * rcu_dereference - fetch an RCU-protected pointer in an
  * RCU read-side critical section.  This pointer may later
  * be safely dereferenced.