rcu: Teach RCU that idle task is not quiscent state at boot

[linux-2.6-block.git] / include / linux / rcutree.h

diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index d4368b7975c3d09d5b1c08d2a822adebb06e62ac..a722fb67bb2d5a2500852c4fd5593f0e91777af0 100644 (file)
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -326,4 +326,10 @@ static inline void rcu_exit_nohz(void)
 }
 #endif /* CONFIG_NO_HZ */
 
+/* A context switch is a grace period for rcutree. */
+static inline int rcu_blocking_is_gp(void)
+{
+       return num_online_cpus() == 1;
+}
+
 #endif /* __LINUX_RCUTREE_H */