linux-kernel - [tip: locking/core] locking/rtmutex: Set proper wait context for lockdep

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Date:   Tue, 17 Aug 2021 20:14:37 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: locking/core] locking/rtmutex: Set proper wait context for lockdep

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

Commit-ID:     b41cda03765580caf7723b8c1b672d191c71013f
Gitweb:        https://git.kernel.org/tip/b41cda03765580caf7723b8c1b672d191c71013f
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Sun, 15 Aug 2021 23:27:38 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 17 Aug 2021 16:38:50 +02:00

locking/rtmutex: Set proper wait context for lockdep

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

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20210815211302.031014562@linutronix.de
---
 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 d1672de..87b325a 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 ad0db32..1a7e3f8 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);
 }