[patch 2/5] rcu head introduce rcu head init on stack

[Mathieu Desnoyers]

PEM:
o     Would it be possible to make this bisectable as follows?

      a.      Insert a new patch after current patch 4/6 that
              defines destroy_rcu_head_on_stack(),
              init_rcu_head_on_stack(), and init_rcu_head() with
              their !CONFIG_DEBUG_OBJECTS_RCU_HEAD definitions.

This patch performs this transition.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
CC: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
CC: David S. Miller <davem@xxxxxxxxxxxxx>
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 |    8 ++++++++
 1 file changed, 8 insertions(+)

Index: linux.trees.git/include/linux/rcupdate.h
===================================================================
--- linux.trees.git.orig/include/linux/rcupdate.h	2010-03-29 09:43:35.000000000 -0400
+++ linux.trees.git/include/linux/rcupdate.h	2010-03-29 09:57:09.000000000 -0400
@@ -83,6 +83,14 @@ extern void rcu_scheduler_starting(void)
        (ptr)->next = NULL; (ptr)->func = NULL; \
 } while (0)
 
+static inline void init_rcu_head_on_stack(struct rcu_head *head)
+{
+}
+
+static inline void destroy_rcu_head_on_stack(struct rcu_head *head)
+{
+}
+
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 
 extern struct lockdep_map rcu_lock_map;

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