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rcu: Make rcu_read_lock_bh_held() allow for disabled BH

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Disabling BH can stand in for rcu_read_lock_bh(), and this patch
updates rcu_read_lock_bh_held() to allow for this.  In order to
avoid include-file hell, this function is moved out of line to
kernel/rcupdate.c.

This fixes a false positive RCU warning.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Lai Jiangshan <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: <20100316000343.GA25857@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul E. McKenney 2010-03-15 17:03:43 -07:00 • committed by Ingo Molnar
parent a3d3203e4b
commit e3818b8dce
2 changed files with 27 additions and 15 deletions
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19
include/linux/rcupdate.h
View file

@ -123,22 +123,11 @@ static inline int rcu_read_lock_held(void)
return lock_is_held(&rcu_lock_map);
}
/**
* rcu_read_lock_bh_held - might we be in RCU-bh read-side critical section?
*
* If CONFIG_PROVE_LOCKING is selected and enabled, returns nonzero iff in
* an RCU-bh read-side critical section. In absence of CONFIG_PROVE_LOCKING,
* this assumes we are in an RCU-bh read-side critical section unless it can
* prove otherwise.
*
* Check rcu_scheduler_active to prevent false positives during boot.
/*
* rcu_read_lock_bh_held() is defined out of line to avoid #include-file
* hell.
*/
static inline int rcu_read_lock_bh_held(void)
{
if (!debug_lockdep_rcu_enabled())
return 1;
return lock_is_held(&rcu_bh_lock_map);
}
extern int rcu_read_lock_bh_held(void);
/**
* rcu_read_lock_sched_held - might we be in RCU-sched read-side critical section?