Commit 6e6f1b30 authored by Lai Jiangshan's avatar Lai Jiangshan Committed by Paul E. McKenney
Browse files

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: default avatarLai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 5a41344a

kernel/srcu.c

+1 −0
Original line number Diff line number Diff line
@@ -421,6 +421,7 @@ 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;