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authorJosh Triplett <josht@vnet.ibm.com>2006-06-30 01:56:05 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-30 11:25:39 -0700
commit7f04ac062e92a37bb0fa3313405597244b4702c1 (patch)
treea81e9df761334ccba5b5793866f96910842a7194
parent7adc28ae75854d9d0940668404a14d1f006f80c0 (diff)
[PATCH] rcu: Add lock annotations to RCU locking primitives
Add __acquire annotations to rcu_read_lock and rcu_read_lock_bh, and add __release annotations to rcu_read_unlock and rcu_read_unlock_bh. This allows sparse to detect improperly paired calls to these functions. Signed-off-by: Josh Triplett <josh@freedesktop.org> Acked-by: Paul E. McKenney <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--include/linux/rcupdate.h24
1 files changed, 20 insertions, 4 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 48dfe00070c..b4ca73d6589 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -163,14 +163,22 @@ extern int rcu_needs_cpu(int cpu);
*
* It is illegal to block while in an RCU read-side critical section.
*/
-#define rcu_read_lock() preempt_disable()
+#define rcu_read_lock() \
+ do { \
+ preempt_disable(); \
+ __acquire(RCU); \
+ } while(0)
/**
* rcu_read_unlock - marks the end of an RCU read-side critical section.
*
* See rcu_read_lock() for more information.
*/
-#define rcu_read_unlock() preempt_enable()
+#define rcu_read_unlock() \
+ do { \
+ __release(RCU); \
+ preempt_enable(); \
+ } while(0)
/*
* So where is rcu_write_lock()? It does not exist, as there is no
@@ -193,14 +201,22 @@ extern int rcu_needs_cpu(int cpu);
* can use just rcu_read_lock().
*
*/
-#define rcu_read_lock_bh() local_bh_disable()
+#define rcu_read_lock_bh() \
+ do { \
+ local_bh_disable(); \
+ __acquire(RCU_BH); \
+ } while(0)
/*
* rcu_read_unlock_bh - marks the end of a softirq-only RCU critical section
*
* See rcu_read_lock_bh() for more information.
*/
-#define rcu_read_unlock_bh() local_bh_enable()
+#define rcu_read_unlock_bh() \
+ do { \
+ __release(RCU_BH); \
+ local_bh_enable(); \
+ } while(0)
/**
* rcu_dereference - fetch an RCU-protected pointer in an