linux-kernel - [PATCH RFC tip/core/rcu 10/11] rcu head remove init

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Message-Id: <1273620786-20392-10-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Tue, 11 May 2010 16:33:05 -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,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: [PATCH RFC tip/core/rcu 10/11] rcu head remove init

From: Mathieu Desnoyers <mathieu.desnoyers@...icios.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: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
CC: David S. Miller <davem@...emloft.net>
CC: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC: akpm@...ux-foundation.org
CC: mingo@...e.hu
CC: laijs@...fujitsu.com
CC: dipankar@...ibm.com
CC: josh@...htriplett.org
CC: dvhltc@...ibm.com
CC: niv@...ibm.com
CC: tglx@...utronix.de
CC: peterz@...radead.org
CC: rostedt@...dmis.org
CC: Valdis.Kletnieks@...edu
CC: dhowells@...hat.com
CC: eric.dumazet@...il.com
CC: Alexey Dobriyan <adobriyan@...il.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 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 b653b4a..3a1a70d 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -73,12 +73,6 @@ 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)
-
 static inline void init_rcu_head_on_stack(struct rcu_head *head)
 {
 }
-- 
1.7.0.6

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