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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@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1267231138-27856-2-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul E. McKenney 2010-02-26 16:38:57 -08:00 committed by Ingo Molnar
parent a47cd880b5
commit 0b1c87278a
1 changed files with 1 additions and 1 deletions
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2
include/linux/rcupdate.h
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@ -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 */