[patch] BFS 421-1: refactor sys_sched_yield

[Hillf Danton]

Runqueue lock is replaced with preempt.

SOB: Hillf Danton <dhillf@xxxxxxxxx>
---

--- a/kernel/sched/bfs.c	Mon Jul  9 20:06:50 2012
+++ b/kernel/sched/bfs.c	Mon Jul  9 20:08:50 2012
@@ -4518,19 +4518,8 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t
  */
 SYSCALL_DEFINE0(sched_yield)
 {
-	struct task_struct *p;
-
-	p = current;
-	grq_lock_irq();
-	schedstat_inc(task_rq(p), yld_count);
-
-	/*
-	 * Since we are going to call schedule() anyway, there's
-	 * no need to preempt or enable interrupts:
-	 */
-	__release(grq.lock);
-	spin_release(&grq.lock.dep_map, 1, _THIS_IP_);
-	do_raw_spin_unlock(&grq.lock);
+	preempt_disable();
+	schedstat_inc(this_rq(), yld_count);
 	preempt_enable_no_resched();

 	schedule();
--
--
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