[tip: locking/core] locking/percpu-rwsem: Add might_sleep() for writer locking

[tip-bot2 for Davidlohr Bueso]

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     41f0e29190ac9e38099a37abd1a8a4cb1dc21233
Gitweb:        https://git.kernel.org/tip/41f0e29190ac9e38099a37abd1a8a4cb1dc21233
Author:        Davidlohr Bueso <dave@xxxxxxxxxxxx>
AuthorDate:    Tue, 07 Jan 2020 17:33:04 -08:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Tue, 11 Feb 2020 13:11:02 +01:00

locking/percpu-rwsem: Add might_sleep() for writer locking

We are missing this annotation in percpu_down_write(). Correct
this.

Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Acked-by: Will Deacon <will@xxxxxxxxxx>
Acked-by: Waiman Long <longman@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20200108013305.7732-1-dave@xxxxxxxxxxxx
---
 kernel/locking/percpu-rwsem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/locking/percpu-rwsem.c b/kernel/locking/percpu-rwsem.c
index 8048a9a..183a3aa 100644
--- a/kernel/locking/percpu-rwsem.c
+++ b/kernel/locking/percpu-rwsem.c
@@ -212,6 +212,7 @@ static bool readers_active_check(struct percpu_rw_semaphore *sem)
 
 void percpu_down_write(struct percpu_rw_semaphore *sem)
 {
+	might_sleep();
 	rwsem_acquire(&sem->dep_map, 0, 0, _RET_IP_);
 
 	/* Notify readers to take the slow path. */