tree 9170fa956be0f564b988a88685eb82584347c2cf
parent 5c1eabe68501d1e1b1586c7f4c46cc531828c4ab
author Mikulas Patocka <mpatocka@redhat.com> 1350949156 -0400
committer Linus Torvalds <torvalds@linux-foundation.org> 1351447176 -0700

percpu-rw-semaphores: use rcu_read_lock_sched

Use rcu_read_lock_sched / rcu_read_unlock_sched / synchronize_sched
instead of rcu_read_lock / rcu_read_unlock / synchronize_rcu.

This is an optimization. The RCU-protected region is very small, so
there will be no latency problems if we disable preempt in this region.

So we use rcu_read_lock_sched / rcu_read_unlock_sched that translates
to preempt_disable / preempt_disable. It is smaller (and supposedly
faster) than preemptible rcu_read_lock / rcu_read_unlock.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>