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rcu: Make srcu_read_lock_held() call common lockdep-enabled function

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A common debug_lockdep_rcu_enabled() function is used to check whether
RCU lockdep splats should be reported, but srcu_read_lock() does not
use it.  This commit therefore brings srcu_read_lock_held() up to date.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2011-10-07 18:22:05 +02:00 committed by Paul E. McKenney
parent ff195cb69b
commit 867f236bd1
1 changed files with 4 additions and 1 deletions
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5
include/linux/srcu.h
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@ -84,6 +84,9 @@ long srcu_batches_completed(struct srcu_struct *sp);
* this assumes we are in an SRCU read-side critical section unless it can * this assumes we are in an SRCU read-side critical section unless it can
* prove otherwise. * prove otherwise.
* *
* Checks debug_lockdep_rcu_enabled() to prevent false positives during boot
* and while lockdep is disabled.
*
* Note that if the CPU is in the idle loop from an RCU point of view * Note that if the CPU is in the idle loop from an RCU point of view
* (ie: that we are in the section between rcu_idle_enter() and * (ie: that we are in the section between rcu_idle_enter() and
* rcu_idle_exit()) then srcu_read_lock_held() returns false even if * rcu_idle_exit()) then srcu_read_lock_held() returns false even if
@ -102,7 +105,7 @@ static inline int srcu_read_lock_held(struct srcu_struct *sp)
if (rcu_is_cpu_idle()) if (rcu_is_cpu_idle())
return 0; return 0;
if (!debug_locks) if (!debug_lockdep_rcu_enabled())
return 1; return 1;
return lock_is_held(&sp->dep_map); return lock_is_held(&sp->dep_map);