sched, rcu: Make RCU use resched_cpu()

We're going to deprecate and remove set_need_resched() for it will do
the wrong thing. Make an exception for RCU and allow it to use
resched_cpu() which will do the right thing.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-2eywnacjl1nllctl1nszqa5w@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 2 insertions, 8 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ac5796783c49..242da0c03aba 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -513,12 +513,11 @@ static inline void init_hrtick(void)
  * might also involve a cross-CPU call to trigger the scheduler on
  * the target CPU.
  */
-#ifdef CONFIG_SMP
 void resched_task(struct task_struct *p)
 {
         int cpu;
 
-        assert_raw_spin_locked(&task_rq(p)->lock);
+        lockdep_assert_held(&task_rq(p)->lock);
 
         if (test_tsk_need_resched(p))
                 return;
@@ -546,6 +545,7 @@ void resched_cpu(int cpu)
         raw_spin_unlock_irqrestore(&rq->lock, flags);
 }
 
+#ifdef CONFIG_SMP
 #ifdef CONFIG_NO_HZ_COMMON
 /*
  * In the semi idle case, use the nearest busy cpu for migrating timers
@@ -693,12 +693,6 @@ void sched_avg_update(struct rq *rq)
         }
 }
 
-#else /* !CONFIG_SMP */
-void resched_task(struct task_struct *p)
-{
-        assert_raw_spin_locked(&task_rq(p)->lock);
-        set_tsk_need_resched(p);
-}
 #endif /* CONFIG_SMP */
 
 #if defined(CONFIG_RT_GROUP_SCHED) || (defined(CONFIG_FAIR_GROUP_SCHED) && \