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-rw-r--r--include/linux/mutex.h37
1 files changed, 28 insertions, 9 deletions
diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index f1ac507fa20d..27c48daa3183 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -13,6 +13,7 @@
#include <linux/list.h>
#include <linux/spinlock_types.h>
#include <linux/linkage.h>
+#include <linux/lockdep.h>
#include <asm/atomic.h>
@@ -50,11 +51,12 @@ struct mutex {
struct list_head wait_list;
#ifdef CONFIG_DEBUG_MUTEXES
struct thread_info *owner;
- struct list_head held_list;
- unsigned long acquire_ip;
const char *name;
void *magic;
#endif
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ struct lockdep_map dep_map;
+#endif
};
/*
@@ -74,24 +76,34 @@ struct mutex_waiter {
# include <linux/mutex-debug.h>
#else
# define __DEBUG_MUTEX_INITIALIZER(lockname)
-# define mutex_init(mutex) __mutex_init(mutex, NULL)
+# define mutex_init(mutex) \
+do { \
+ static struct lock_class_key __key; \
+ \
+ __mutex_init((mutex), #mutex, &__key); \
+} while (0)
# define mutex_destroy(mutex) do { } while (0)
-# define mutex_debug_show_all_locks() do { } while (0)
-# define mutex_debug_show_held_locks(p) do { } while (0)
-# define mutex_debug_check_no_locks_held(task) do { } while (0)
-# define mutex_debug_check_no_locks_freed(from, len) do { } while (0)
+#endif
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
+ , .dep_map = { .name = #lockname }
+#else
+# define __DEP_MAP_MUTEX_INITIALIZER(lockname)
#endif
#define __MUTEX_INITIALIZER(lockname) \
{ .count = ATOMIC_INIT(1) \
, .wait_lock = SPIN_LOCK_UNLOCKED \
, .wait_list = LIST_HEAD_INIT(lockname.wait_list) \
- __DEBUG_MUTEX_INITIALIZER(lockname) }
+ __DEBUG_MUTEX_INITIALIZER(lockname) \
+ __DEP_MAP_MUTEX_INITIALIZER(lockname) }
#define DEFINE_MUTEX(mutexname) \
struct mutex mutexname = __MUTEX_INITIALIZER(mutexname)
-extern void fastcall __mutex_init(struct mutex *lock, const char *name);
+extern void __mutex_init(struct mutex *lock, const char *name,
+ struct lock_class_key *key);
/***
* mutex_is_locked - is the mutex locked
@@ -110,6 +122,13 @@ static inline int fastcall mutex_is_locked(struct mutex *lock)
*/
extern void fastcall mutex_lock(struct mutex *lock);
extern int fastcall mutex_lock_interruptible(struct mutex *lock);
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+extern void mutex_lock_nested(struct mutex *lock, unsigned int subclass);
+#else
+# define mutex_lock_nested(lock, subclass) mutex_lock(lock)
+#endif
+
/*
* NOTE: mutex_trylock() follows the spin_trylock() convention,
* not the down_trylock() convention!
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