rcu: Remove cond_resched() from Tiny synchronize_sched()
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Tue, 10 Jan 2017 07:23:15 +0000 (23:23 -0800)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Sun, 15 Jan 2017 05:22:20 +0000 (21:22 -0800)
It is now legal to invoke synchronize_sched() at early boot, which causes
Tiny RCU's synchronize_sched() to emit spurious splats.  This commit
therefore removes the cond_resched() from Tiny RCU's synchronize_sched().

Fixes: 8b355e3bc140 ("rcu: Drive expedited grace periods from workqueue")
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: <stable@vger.kernel.org> # 4.9.0-
kernel/rcu/tiny.c

index 1898559..b23a4d0 100644 (file)
@@ -185,9 +185,6 @@ static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused
  * benefits of doing might_sleep() to reduce latency.)
  *
  * Cool, huh?  (Due to Josh Triplett.)
- *
- * But we want to make this a static inline later.  The cond_resched()
- * currently makes this problematic.
  */
 void synchronize_sched(void)
 {
@@ -195,7 +192,6 @@ void synchronize_sched(void)
                         lock_is_held(&rcu_lock_map) ||
                         lock_is_held(&rcu_sched_lock_map),
                         "Illegal synchronize_sched() in RCU read-side critical section");
-       cond_resched();
 }
 EXPORT_SYMBOL_GPL(synchronize_sched);