rcu: Don't do reschedule unless in irq

Condition the set_need_resched() in rcu_irq_exit() on in_irq().  This
should be a no-op, because rcu_irq_exit() should only be called from irq.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 011bf6f261a2..195b3a3313e3 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -421,8 +421,9 @@ void rcu_irq_exit(void)
         WARN_ON_ONCE(rdtp->dynticks & 0x1);
 
         /* If the interrupt queued a callback, get out of dyntick mode. */
-        if (__this_cpu_read(rcu_sched_data.nxtlist) ||
-            __this_cpu_read(rcu_bh_data.nxtlist))
+        if (in_irq() &&
+            (__this_cpu_read(rcu_sched_data.nxtlist) ||
+             __this_cpu_read(rcu_bh_data.nxtlist)))
                 set_need_resched();
 }