[PATCH AUTOSEL 5.14 167/252] locking/rtmutex: Set proper wait context for lockdep

[Sasha Levin]

From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

[ Upstream commit b41cda03765580caf7723b8c1b672d191c71013f ]

RT mutexes belong to the LD_WAIT_SLEEP class. Make them so.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210815211302.031014562@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 include/linux/rtmutex.h  | 19 ++++++++++++-------
 kernel/locking/rtmutex.c |  2 +-
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h
index d1672de9ca89..87b325aec508 100644
--- a/include/linux/rtmutex.h
+++ b/include/linux/rtmutex.h
@@ -52,17 +52,22 @@ do { \
 } while (0)
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
-#define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname) \
-	, .dep_map = { .name = #mutexname }
+#define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)	\
+	.dep_map = {					\
+		.name = #mutexname,			\
+		.wait_type_inner = LD_WAIT_SLEEP,	\
+	}
 #else
 #define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)
 #endif
 
-#define __RT_MUTEX_INITIALIZER(mutexname) \
-	{ .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
-	, .waiters = RB_ROOT_CACHED \
-	, .owner = NULL \
-	__DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)}
+#define __RT_MUTEX_INITIALIZER(mutexname)				\
+{									\
+	.wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock),	\
+	.waiters = RB_ROOT_CACHED,					\
+	.owner = NULL,							\
+	__DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)			\
+}
 
 #define DEFINE_RT_MUTEX(mutexname) \
 	struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index ad0db322ed3b..1a7e3f838077 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1556,7 +1556,7 @@ void __sched __rt_mutex_init(struct rt_mutex *lock, const char *name,
 		     struct lock_class_key *key)
 {
 	debug_check_no_locks_freed((void *)lock, sizeof(*lock));
-	lockdep_init_map(&lock->dep_map, name, key, 0);
+	lockdep_init_map_wait(&lock->dep_map, name, key, 0, LD_WAIT_SLEEP);
 
 	__rt_mutex_basic_init(lock);
 }
-- 
2.30.2