srcu: Add might_sleep() annotation to synchronize_srcu()
Although synchronize_srcu() can sleep, it will not sleep if the fast
path succeeds, which means that illegal use of synchronize_rcu()
might go unnoticed. This commit therefore adds might_sleep(), which
unconditionally catches illegal use of synchronize_rcu() from atomic
context.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
diff --git a/kernel/srcu.c b/kernel/srcu.c
index c9d003b..3e43a21 100644
--- a/kernel/srcu.c
+++ b/kernel/srcu.c
@@ -421,6 +421,7 @@
!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;