rcu: The rcu_needs_cpu() function is not a quiescent state

The TINY_PREEMPT_RCU() function rcu_preempt_needs_cpu(), which is called from rcu_needs_cpu(), assumes that it is in a quiescent state with respect to the CPU. This is no longer the case. This commit therefore updates rcu_preempt_needs_cpu() to make it aware that it is not running in a quiescent state. Signed-off-by: Paul E. McKenney <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Tested-by: Heiko Carstens <[email protected]> Tested-by: Pascal Chapperon <[email protected]>
rtvt123 · Jul 2, 2012 · 28f8555 · 28f8555
1 parent bf1304e
commit 28f8555
Showing 1 changed file with 0 additions and 2 deletions.
diff --git a/kernel/rcutiny_plugin.h b/kernel/rcutiny_plugin.h
@@ -846,8 +846,6 @@ EXPORT_SYMBOL_GPL(synchronize_rcu_expedited);
  */
 int rcu_preempt_needs_cpu(void)
 {
-	if (!rcu_preempt_running_reader())
-		rcu_preempt_cpu_qs();
 	return rcu_preempt_ctrlblk.rcb.rcucblist != NULL;
 }