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Next: [PATCH tip/core/rcu 05/10] rcu: restrict TREE_RCU to SMP builds with !PREEMPT
From: Paul E. McKenney on 9 Aug 2010 18:20
From: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com>

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: Alexey Dobriyan <adobriyan(a)gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com>
CC: David S. Miller <davem(a)davemloft.net>
CC: "Paul E. McKenney" <paulmck(a)linux.vnet.ibm.com>
CC: akpm(a)linux-foundation.org
CC: mingo(a)elte.hu
CC: laijs(a)cn.fujitsu.com
CC: dipankar(a)in.ibm.com
CC: josh(a)joshtriplett.org
CC: dvhltc(a)us.ibm.com
CC: niv(a)us.ibm.com
CC: tglx(a)linutronix.de
CC: peterz(a)infradead.org
CC: rostedt(a)goodmis.org
CC: Valdis.Kletnieks(a)vt.edu
CC: dhowells(a)redhat.com
CC: eric.dumazet(a)gmail.com
CC: Alexey Dobriyan <adobriyan(a)gmail.com>
Signed-off-by: Paul E. McKenney <paulmck(a)linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh(a)joshtriplett.org>
---
include/linux/rcupdate.h | 6 ------
1 files changed, 0 insertions(+), 6 deletions(-)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 3e1b662..27b44b3 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -75,12 +75,6 @@ extern void rcu_init(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)
-
/*
* init_rcu_head_on_stack()/destroy_rcu_head_on_stack() are needed for dynamic
* initialization and destruction of rcu_head on the stack. rcu_head structures
--
1.7.0.6

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Prev: [PATCH tip/core/rcu 02/10] Update documentation to note the passage of INIT_RCU_HEAD()
Next: [PATCH tip/core/rcu 05/10] rcu: restrict TREE_RCU to SMP builds with !PREEMPT