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authorJohannes Berg <johannes@sipsolutions.net>2009-01-29 16:03:20 +0100
committerIngo Molnar <mingo@elte.hu>2009-02-14 23:25:52 +0100
commit6f2b9b9a9d750a9175dc79c74bfed5add840983c (patch)
tree176fda4698f3ee6dfa4f35febe9fb959f584d353 /include/linux/timer.h
parent673f8205914a12e928c65afbcd78ae748f78df53 (diff)
timer: implement lockdep deadlock detection
This modifies the timer code in a way to allow lockdep to detect deadlocks resulting from a lock being taken in the timer function as well as around the del_timer_sync() call. Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Diffstat (limited to 'include/linux/timer.h')
-rw-r--r--include/linux/timer.h93
1 files changed, 84 insertions, 9 deletions
diff --git a/include/linux/timer.h b/include/linux/timer.h
index daf9685b861..51774eb87cc 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -5,6 +5,7 @@
#include <linux/ktime.h>
#include <linux/stddef.h>
#include <linux/debugobjects.h>
+#include <linux/stringify.h>
struct tvec_base;
@@ -21,52 +22,126 @@ struct timer_list {
char start_comm[16];
int start_pid;
#endif
+#ifdef CONFIG_LOCKDEP
+ struct lockdep_map lockdep_map;
+#endif
};
extern struct tvec_base boot_tvec_bases;
+#ifdef CONFIG_LOCKDEP
+/*
+ * NB: because we have to copy the lockdep_map, setting the lockdep_map key
+ * (second argument) here is required, otherwise it could be initialised to
+ * the copy of the lockdep_map later! We use the pointer to and the string
+ * "<file>:<line>" as the key resp. the name of the lockdep_map.
+ */
+#define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn) \
+ .lockdep_map = STATIC_LOCKDEP_MAP_INIT(_kn, &_kn),
+#else
+#define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn)
+#endif
+
#define TIMER_INITIALIZER(_function, _expires, _data) { \
.entry = { .prev = TIMER_ENTRY_STATIC }, \
.function = (_function), \
.expires = (_expires), \
.data = (_data), \
.base = &boot_tvec_bases, \
+ __TIMER_LOCKDEP_MAP_INITIALIZER( \
+ __FILE__ ":" __stringify(__LINE__)) \
}
#define DEFINE_TIMER(_name, _function, _expires, _data) \
struct timer_list _name = \
TIMER_INITIALIZER(_function, _expires, _data)
-void init_timer(struct timer_list *timer);
-void init_timer_deferrable(struct timer_list *timer);
+void init_timer_key(struct timer_list *timer,
+ const char *name,
+ struct lock_class_key *key);
+void init_timer_deferrable_key(struct timer_list *timer,
+ const char *name,
+ struct lock_class_key *key);
+
+#ifdef CONFIG_LOCKDEP
+#define init_timer(timer) \
+ do { \
+ static struct lock_class_key __key; \
+ init_timer_key((timer), #timer, &__key); \
+ } while (0)
+
+#define init_timer_deferrable(timer) \
+ do { \
+ static struct lock_class_key __key; \
+ init_timer_deferrable_key((timer), #timer, &__key); \
+ } while (0)
+
+#define init_timer_on_stack(timer) \
+ do { \
+ static struct lock_class_key __key; \
+ init_timer_on_stack_key((timer), #timer, &__key); \
+ } while (0)
+
+#define setup_timer(timer, fn, data) \
+ do { \
+ static struct lock_class_key __key; \
+ setup_timer_key((timer), #timer, &__key, (fn), (data));\
+ } while (0)
+
+#define setup_timer_on_stack(timer, fn, data) \
+ do { \
+ static struct lock_class_key __key; \
+ setup_timer_on_stack_key((timer), #timer, &__key, \
+ (fn), (data)); \
+ } while (0)
+#else
+#define init_timer(timer)\
+ init_timer_key((timer), NULL, NULL)
+#define init_timer_deferrable(timer)\
+ init_timer_deferrable_key((timer), NULL, NULL)
+#define init_timer_on_stack(timer)\
+ init_timer_on_stack_key((timer), NULL, NULL)
+#define setup_timer(timer, fn, data)\
+ setup_timer_key((timer), NULL, NULL, (fn), (data))
+#define setup_timer_on_stack(timer, fn, data)\
+ setup_timer_on_stack_key((timer), NULL, NULL, (fn), (data))
+#endif
#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
-extern void init_timer_on_stack(struct timer_list *timer);
+extern void init_timer_on_stack_key(struct timer_list *timer,
+ const char *name,
+ struct lock_class_key *key);
extern void destroy_timer_on_stack(struct timer_list *timer);
#else
static inline void destroy_timer_on_stack(struct timer_list *timer) { }
-static inline void init_timer_on_stack(struct timer_list *timer)
+static inline void init_timer_on_stack_key(struct timer_list *timer,
+ const char *name,
+ struct lock_class_key *key)
{
- init_timer(timer);
+ init_timer_key(timer, name, key);
}
#endif
-static inline void setup_timer(struct timer_list * timer,
+static inline void setup_timer_key(struct timer_list * timer,
+ const char *name,
+ struct lock_class_key *key,
void (*function)(unsigned long),
unsigned long data)
{
timer->function = function;
timer->data = data;
- init_timer(timer);
+ init_timer_key(timer, name, key);
}
-static inline void setup_timer_on_stack(struct timer_list *timer,
+static inline void setup_timer_on_stack_key(struct timer_list *timer,
+ const char *name,
+ struct lock_class_key *key,
void (*function)(unsigned long),
unsigned long data)
{
timer->function = function;
timer->data = data;
- init_timer_on_stack(timer);
+ init_timer_on_stack_key(timer, name, key);
}
/**