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srcu: Add might_sleep() annotation to synchronize_srcu()

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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>
This commit is contained in:
Lai Jiangshan 2012-11-29 16:46:03 +08:00 committed by Paul E. McKenney
parent 5a41344a3d
commit 6e6f1b307e
1 changed files with 1 additions and 0 deletions
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kernel/srcu.c
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@ -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;