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 CC: Peter Zijlstra CC: Paul E McKenney CC: akpm@linux-foundation.org --- include/linux/rcupdate.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) Index: linux-2.6-lttng/include/linux/rcupdate.h =================================================================== --- linux-2.6-lttng.orig/include/linux/rcupdate.h 2008-07-15 15:28:08.000000000 -0400 +++ linux-2.6-lttng/include/linux/rcupdate.h 2008-07-15 17:38:02.000000000 -0400 @@ -133,6 +133,24 @@ 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. -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/