From: Davidlohr Bueso <dave@stgolabs.net>
Date: Wed, 8 Jan 2020 01:33:04 +0000 (-0800)
Subject: locking/percpu-rwsem: Add might_sleep() for writer locking
X-Git-Tag: v5.7-rc1~181^2~35
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=41f0e29190ac9e38099a37abd1a8a4cb1dc21233;p=thirdparty%2Fkernel%2Flinux.git

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@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Waiman Long <longman@redhat.com>
Link: https://lkml.kernel.org/r/20200108013305.7732-1-dave@stgolabs.net
---

diff --git a/kernel/locking/percpu-rwsem.c b/kernel/locking/percpu-rwsem.c
index 8048a9a255d5e..183a3aaa85099 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. */