[patch 4/5] rcu head remove init

[Mathieu Desnoyers]

RCU heads really don't need to be initialized. Their state before call_rcu()
really does not matter.

We need to keep init/destroy_rcu_head_on_stack() though, since we want
debugobjects to be able to keep track of these objects.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
CC: David S. Miller <davem@xxxxxxxxxxxxx>
CC: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
CC: akpm@xxxxxxxxxxxxxxxxxxxx
CC: mingo@xxxxxxx
CC: laijs@xxxxxxxxxxxxxx
CC: dipankar@xxxxxxxxxx
CC: josh@xxxxxxxxxxxxxxxx
CC: dvhltc@xxxxxxxxxx
CC: niv@xxxxxxxxxx
CC: tglx@xxxxxxxxxxxxx
CC: peterz@xxxxxxxxxxxxx
CC: rostedt@xxxxxxxxxxx
CC: Valdis.Kletnieks@xxxxxx
CC: dhowells@xxxxxxxxxx
CC: eric.dumazet@xxxxxxxxx
CC: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---
 include/linux/rcupdate.h |    6 ------
 1 file changed, 6 deletions(-)

Index: linux.trees.git/include/linux/rcupdate.h
===================================================================
--- linux.trees.git.orig/include/linux/rcupdate.h	2010-03-29 10:11:32.000000000 -0400
+++ linux.trees.git/include/linux/rcupdate.h	2010-03-29 10:11:42.000000000 -0400
@@ -77,12 +77,6 @@ extern void rcu_scheduler_starting(void)
 #error "Unknown RCU implementation specified to kernel configuration"
 #endif
 
-#define RCU_HEAD_INIT	{ .next = NULL, .func = NULL }
-#define RCU_HEAD(head) struct rcu_head head = RCU_HEAD_INIT
-#define INIT_RCU_HEAD(ptr) do { \
-       (ptr)->next = NULL; (ptr)->func = NULL; \
-} while (0)
-
 static inline void init_rcu_head_on_stack(struct rcu_head *head)
 {
 }

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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