[tip:core/rcu] rcu: Make non-RCU_PROVE_LOCKING rcu_read_lock_sched_held() understand boot

[tip-bot for Paul E. McKenney]

Commit-ID:  0b1c87278a8c7e394022ec184a0b44a3886b6fde
Gitweb:     http://git.kernel.org/tip/0b1c87278a8c7e394022ec184a0b44a3886b6fde
Author:     Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Fri, 26 Feb 2010 16:38:57 -0800
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Sat, 27 Feb 2010 09:53:52 +0100

rcu: Make non-RCU_PROVE_LOCKING rcu_read_lock_sched_held() understand boot

Before the scheduler starts, all tasks are non-preemptible by
definition. So, during that time, rcu_read_lock_sched_held()
needs to always return "true".  This patch makes that be so
for RCU_PROVE_LOCKING=n.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: laijs@xxxxxxxxxxxxxx
Cc: dipankar@xxxxxxxxxx
Cc: mathieu.desnoyers@xxxxxxxxxx
Cc: josh@xxxxxxxxxxxxxxxx
Cc: dvhltc@xxxxxxxxxx
Cc: niv@xxxxxxxxxx
Cc: peterz@xxxxxxxxxxxxx
Cc: rostedt@xxxxxxxxxxx
Cc: Valdis.Kletnieks@xxxxxx
Cc: dhowells@xxxxxxxxxx
LKML-Reference: <1267231138-27856-2-git-send-email-paulmck@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
 include/linux/rcupdate.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index fcea332..c843736 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -166,7 +166,7 @@ static inline int rcu_read_lock_bh_held(void)
 
 static inline int rcu_read_lock_sched_held(void)
 {
-	return preempt_count() != 0;
+	return preempt_count() != 0 || !rcu_scheduler_active;
 }
 
 #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
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