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rcu: add rcu_read_lock_sched() / rcu_read_unlock_sched()

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Add rcu_read_lock_sched() and rcu_read_unlock_sched() to rcupdate.h to match the
recently added write-side call_rcu_sched() and rcu_barrier_sched(). They also
match the no-so-recently-added synchronize_sched().

It will help following matching use of the update/read lock primitives. Those
new read lock will replace preempt_disable()/enable() used in pair with
RCU-classic synchronization.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mathieu Desnoyers 2008-09-29 11:06:46 -04:00 committed by Ingo Molnar
parent 3a72dc8eb5
commit 1c50b728c3
1 changed files with 20 additions and 0 deletions
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20
include/linux/rcupdate.h
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@ -132,6 +132,26 @@ struct rcu_head {
*/ */
#define rcu_read_unlock_bh() __rcu_read_unlock_bh() #define rcu_read_unlock_bh() __rcu_read_unlock_bh()
/**
* rcu_read_lock_sched - mark the beginning of a RCU-classic critical section
*
* Should be used with either
* - synchronize_sched()
* or
* - call_rcu_sched() and rcu_barrier_sched()
* on the write-side to insure proper synchronization.
*/
#define rcu_read_lock_sched() preempt_disable()
/*
* rcu_read_unlock_sched - marks the end of a RCU-classic critical section
*
* See rcu_read_lock_sched for more information.
*/
#define rcu_read_unlock_sched() preempt_enable()
/** /**
* rcu_dereference - fetch an RCU-protected pointer in an * rcu_dereference - fetch an RCU-protected pointer in an
* RCU read-side critical section. This pointer may later * RCU read-side critical section. This pointer may later