linux-kernel - [PATCH RFC tip/core/rcu 28/30] rcu: rename __do_rcu_dereference_check() to rcu_lockdep

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Date:	Wed, 14 Jul 2010 13:10:02 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH RFC tip/core/rcu 28/30] rcu: rename __do_rcu_dereference_check() to rcu_lockdep_assert()

The __do_rcu_dereference_check() functionality needs to be exported,
so make a real name for it.  This allows RCU-lockdep assertions to
be used independent of rcu_dereference() and friends.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 include/linux/rcupdate.h |   14 +++++++++-----
 1 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 0ce0f05..508ebba 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -209,7 +209,11 @@ static inline int rcu_read_lock_sched_held(void)
 
 extern int rcu_my_thread_group_empty(void);
 
-#define __do_rcu_dereference_check(c)					\
+/**
+ * rcu_lockdep_assert - emit lockdep splat if specified condition not met
+ * @c: condition to check
+ */
+#define rcu_lockdep_assert(c)						\
 	do {								\
 		static bool __warned;					\
 		if (debug_lockdep_rcu_enabled() && !__warned && !(c)) {	\
@@ -220,7 +224,7 @@ extern int rcu_my_thread_group_empty(void);
 
 #else /* #ifdef CONFIG_PROVE_RCU */
 
-#define __do_rcu_dereference_check(c) do { } while (0)
+#define rcu_lockdep_assert(c) do { } while (0)
 
 #endif /* #else #ifdef CONFIG_PROVE_RCU */
 
@@ -241,14 +245,14 @@ extern int rcu_my_thread_group_empty(void);
 #define __rcu_dereference_check(p, c, space) \
 	({ \
 		typeof(*p) *_________p1 = (typeof(*p)*__force )ACCESS_ONCE(p); \
-		__do_rcu_dereference_check(c); \
+		rcu_lockdep_assert(c); \
 		(void) (((typeof (*p) space *)p) == p); \
 		smp_read_barrier_depends(); \
 		((typeof(*p) __force __kernel *)(_________p1)); \
 	})
 #define __rcu_dereference_protected(p, c, space) \
 	({ \
-		__do_rcu_dereference_check(c); \
+		rcu_lockdep_assert(c); \
 		(void) (((typeof (*p) space *)p) == p); \
 		((typeof(*p) __force __kernel *)(p)); \
 	})
@@ -256,7 +260,7 @@ extern int rcu_my_thread_group_empty(void);
 #define __rcu_dereference_index_check(p, c) \
 	({ \
 		typeof(p) _________p1 = ACCESS_ONCE(p); \
-		__do_rcu_dereference_check(c); \
+		rcu_lockdep_assert(c); \
 		smp_read_barrier_depends(); \
 		(_________p1); \
 	})
-- 
1.7.0.6

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