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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2007-10-11 22:11:12 +0200
committerPeter Zijlstra <a.p.zijlstra@chello.nl>2007-10-11 22:11:12 +0200
commit851a67b825540a8e00c0be3ee25e4627ba8b133b (patch)
tree07afd72ad74a392cb30cefcd01acdfd9b01282d3 /include/linux/rcupdate.h
parent34a3d1e83708702ac6cb872215e68cd07dae298b (diff)
lockdep: annotate rcu_read_{,un}lock{,_bh}
lockdep annotate rcu_read_{,un}lock{,_bh} in order to catch imbalanced usage. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rcupdate.h')
-rw-r--r--include/linux/rcupdate.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index fe17d7d750c2..76c1a530edc5 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -41,6 +41,7 @@
#include <linux/percpu.h>
#include <linux/cpumask.h>
#include <linux/seqlock.h>
+#include <linux/lockdep.h>
/**
* struct rcu_head - callback structure for use with RCU
@@ -133,6 +134,15 @@ static inline void rcu_bh_qsctr_inc(int cpu)
extern int rcu_pending(int cpu);
extern int rcu_needs_cpu(int cpu);
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+extern struct lockdep_map rcu_lock_map;
+# define rcu_read_acquire() lock_acquire(&rcu_lock_map, 0, 0, 2, 1, _THIS_IP_)
+# define rcu_read_release() lock_release(&rcu_lock_map, 1, _THIS_IP_)
+#else
+# define rcu_read_acquire() do { } while (0)
+# define rcu_read_release() do { } while (0)
+#endif
+
/**
* rcu_read_lock - mark the beginning of an RCU read-side critical section.
*
@@ -166,6 +176,7 @@ extern int rcu_needs_cpu(int cpu);
do { \
preempt_disable(); \
__acquire(RCU); \
+ rcu_read_acquire(); \
} while(0)
/**
@@ -175,6 +186,7 @@ extern int rcu_needs_cpu(int cpu);
*/
#define rcu_read_unlock() \
do { \
+ rcu_read_release(); \
__release(RCU); \
preempt_enable(); \
} while(0)
@@ -204,6 +216,7 @@ extern int rcu_needs_cpu(int cpu);
do { \
local_bh_disable(); \
__acquire(RCU_BH); \
+ rcu_read_acquire(); \
} while(0)
/*
@@ -213,6 +226,7 @@ extern int rcu_needs_cpu(int cpu);
*/
#define rcu_read_unlock_bh() \
do { \
+ rcu_read_release(); \
__release(RCU_BH); \
local_bh_enable(); \
} while(0)