[PATCH 2/8] srcu: add might_sleep() annotation to synchronize_srcu()

[Lai Jiangshan <laijs@cn.fujitsu.com>]

synchronize_srcu() can sleep but it will not sleep if the fast path
succeeds. This annotation will helps us to catch the problem early
if it is called in a wrong contex which can't sleep.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
 kernel/srcu.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/srcu.c b/kernel/srcu.c
index b2e4f36..48d0edb 100644
--- a/kernel/srcu.c
+++ b/kernel/srcu.c
@@ -417,6 +417,7 @@ static void __synchronize_srcu(struct srcu_struct *sp, int trycount)
 			   !lock_is_held(&rcu_sched_lock_map),
 			   "Illegal synchronize_srcu() in same-type SRCU (or RCU) read-side critical section");
 
+	might_sleep();
 	init_completion(&rcu.completion);
 
 	head->next = NULL;
-- 
1.7.4.4