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| author | Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | 2008-09-29 19:06:46 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-30 14:08:41 +0400 |
| commit | 1c50b728c3e734150b8a4a8310ce3e01bc5c70be (patch) | |
| tree | a9781d8dcdb575a91e7c9e374977d473b87fcad8 | |
| parent | 3a72dc8eb5a7122fff439a22bd22486a4fff505c (diff) | |
| download | linux-1c50b728c3e734150b8a4a8310ce3e01bc5c70be.tar.xz | |
rcu: add rcu_read_lock_sched() / rcu_read_unlock_sched()
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>
| -rw-r--r-- | include/linux/rcupdate.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index e8b4039cfb2f..86f1f5e43e33 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -133,6 +133,26 @@ struct rcu_head { #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 read-side critical section. This pointer may later * be safely dereferenced. |