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From: Paul E. McKenney on 20 Apr 2010 17:50
From: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com>

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(a)efficios.com>
CC: "Paul E. McKenney" <paulmck(a)linux.vnet.ibm.com>
CC: David S. Miller <davem(a)davemloft.net>
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>
---
include/linux/rcupdate.h | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 6e6f851..c63372b 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -79,6 +79,14 @@ extern void rcu_init(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;
--
1.7.0

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Prev: [PATCH tip/core/rcu 12/23] rcu: disable CPU stall warnings upon panic
Next: [PATCH tip/core/rcu 04/23] rcu: ignore offline CPUs in last non-dyntick-idle CPU check