Mikulas Patocka
1bf11c5353
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 >
2012-10-28 10:59:36 -07:00
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