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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2008-09-29 11:06:46 -0400
committerIngo Molnar <mingo@elte.hu>2008-09-30 12:08:41 +0200
commit1c50b728c3e734150b8a4a8310ce3e01bc5c70be (patch)
treea9781d8dcdb575a91e7c9e374977d473b87fcad8
parent3a72dc8eb5a7122fff439a22bd22486a4fff505c (diff)
rcu: add rcu_read_lock_sched() / rcu_read_unlock_sched()
Add rcu_read_lock_sched() and rcu_read_unlock_sched() to rcupdate.h to match the recently added write-side call_rcu_sched() and rcu_barrier_sched(). They also match the no-so-recently-added synchronize_sched(). It will help following matching use of the update/read lock primitives. Those new read lock will replace preempt_disable()/enable() used in pair with RCU-classic synchronization. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--include/linux/rcupdate.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index e8b4039cfb2..86f1f5e43e3 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -133,6 +133,26 @@ struct rcu_head {
#define rcu_read_unlock_bh() __rcu_read_unlock_bh()
/**
+ * 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.