aboutsummaryrefslogtreecommitdiff
path: root/include/linux/lockdep.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/lockdep.h')
-rw-r--r--include/linux/lockdep.h18
1 files changed, 17 insertions, 1 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index b25d1b53df0..9ccf0e286b2 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -149,6 +149,12 @@ struct lock_list {
struct lock_class *class;
struct stack_trace trace;
int distance;
+
+ /*
+ * The parent field is used to implement breadth-first search, and the
+ * bit 0 is reused to indicate if the lock has been accessed in BFS.
+ */
+ struct lock_list *parent;
};
/*
@@ -208,10 +214,12 @@ struct held_lock {
* interrupt context:
*/
unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */
- unsigned int trylock:1;
+ unsigned int trylock:1; /* 16 bits */
+
unsigned int read:2; /* see lock_acquire() comment */
unsigned int check:2; /* see lock_acquire() comment */
unsigned int hardirqs_off:1;
+ unsigned int references:11; /* 32 bits */
};
/*
@@ -291,6 +299,10 @@ extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
extern void lock_release(struct lockdep_map *lock, int nested,
unsigned long ip);
+#define lockdep_is_held(lock) lock_is_held(&(lock)->dep_map)
+
+extern int lock_is_held(struct lockdep_map *lock);
+
extern void lock_set_class(struct lockdep_map *lock, const char *name,
struct lock_class_key *key, unsigned int subclass,
unsigned long ip);
@@ -309,6 +321,8 @@ extern void lockdep_trace_alloc(gfp_t mask);
#define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0)
+#define lockdep_assert_held(l) WARN_ON(debug_locks && !lockdep_is_held(l))
+
#else /* !LOCKDEP */
static inline void lockdep_off(void)
@@ -353,6 +367,8 @@ struct lock_class_key { };
#define lockdep_depth(tsk) (0)
+#define lockdep_assert_held(l) do { } while (0)
+
#endif /* !LOCKDEP */
#ifdef CONFIG_LOCK_STAT