lockdep: fixup mutex annotations

The fancy mutex_lock fastpath has too many indirections to track the caller
hence all contentions are perceived to come from mutex_lock().

Avoid this by explicitly not using the fastpath code (it was disabled already
anyway).

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 0d50ea3..6a735c7 100644 (file)
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -120,14 +120,17 @@ static inline int fastcall mutex_is_locked(struct mutex *lock)
  * See kernel/mutex.c for detailed documentation of these APIs.
  * Also see Documentation/mutex-design.txt.
  */
-extern void fastcall mutex_lock(struct mutex *lock);
-extern int __must_check fastcall mutex_lock_interruptible(struct mutex *lock);
-
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 extern void mutex_lock_nested(struct mutex *lock, unsigned int subclass);
 extern int __must_check mutex_lock_interruptible_nested(struct mutex *lock,
                                        unsigned int subclass);
+
+#define mutex_lock(lock) mutex_lock_nested(lock, 0)
+#define mutex_lock_interruptible(lock) mutex_lock_interruptible_nested(lock, 0)
 #else
+extern void fastcall mutex_lock(struct mutex *lock);
+extern int __must_check fastcall mutex_lock_interruptible(struct mutex *lock);
+
 # define mutex_lock_nested(lock, subclass) mutex_lock(lock)
 # define mutex_lock_interruptible_nested(lock, subclass) mutex_lock_interruptible(lock)
 #endif

diff --git a/kernel/mutex.c b/kernel/mutex.c
index 691b865..d7fe50c 100644 (file)
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -51,6 +51,7 @@ __mutex_init(struct mutex *lock, const char *name, struct lock_class_key *key)
 
 EXPORT_SYMBOL(__mutex_init);
 
+#ifndef CONFIG_DEBUG_LOCK_ALLOC
 /*
  * We split the mutex lock/unlock logic into separate fastpath and
  * slowpath functions, to reduce the register pressure on the fastpath.
@@ -92,6 +93,7 @@ void inline fastcall __sched mutex_lock(struct mutex *lock)
 }
 
 EXPORT_SYMBOL(mutex_lock);
+#endif
 
 static void fastcall noinline __sched
 __mutex_unlock_slowpath(atomic_t *lock_count);
@@ -122,7 +124,8 @@ EXPORT_SYMBOL(mutex_unlock);
  * Lock a mutex (possibly interruptible), slowpath:
  */
 static inline int __sched
-__mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
+__mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
+               unsigned long ip)
 {
        struct task_struct *task = current;
        struct mutex_waiter waiter;
@@ -132,7 +135,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
        spin_lock_mutex(&lock->wait_lock, flags);
 
        debug_mutex_lock_common(lock, &waiter);
-       mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+       mutex_acquire(&lock->dep_map, subclass, 0, ip);
        debug_mutex_add_waiter(lock, &waiter, task_thread_info(task));
 
        /* add waiting tasks to the end of the waitqueue (FIFO): */
@@ -143,7 +146,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
        if (old_val == 1)
                goto done;
 
-       lock_contended(&lock->dep_map, _RET_IP_);
+       lock_contended(&lock->dep_map, ip);
 
        for (;;) {
                /*
@@ -166,7 +169,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
                if (unlikely(state == TASK_INTERRUPTIBLE &&
                                                signal_pending(task))) {
                        mutex_remove_waiter(lock, &waiter, task_thread_info(task));
-                       mutex_release(&lock->dep_map, 1, _RET_IP_);
+                       mutex_release(&lock->dep_map, 1, ip);
                        spin_unlock_mutex(&lock->wait_lock, flags);
 
                        debug_mutex_free_waiter(&waiter);
@@ -197,20 +200,12 @@ done:
        return 0;
 }
 
-static void fastcall noinline __sched
-__mutex_lock_slowpath(atomic_t *lock_count)
-{
-       struct mutex *lock = container_of(lock_count, struct mutex, count);
-
-       __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, 0);
-}
-
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 void __sched
 mutex_lock_nested(struct mutex *lock, unsigned int subclass)
 {
        might_sleep();
-       __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, subclass);
+       __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, subclass, _RET_IP_);
 }
 
 EXPORT_SYMBOL_GPL(mutex_lock_nested);
@@ -219,7 +214,7 @@ int __sched
 mutex_lock_interruptible_nested(struct mutex *lock, unsigned int subclass)
 {
        might_sleep();
-       return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, subclass);
+       return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, subclass, _RET_IP_);
 }
 
 EXPORT_SYMBOL_GPL(mutex_lock_interruptible_nested);
@@ -271,6 +266,7 @@ __mutex_unlock_slowpath(atomic_t *lock_count)
        __mutex_unlock_common_slowpath(lock_count, 1);
 }
 
+#ifndef CONFIG_DEBUG_LOCK_ALLOC
 /*
  * Here come the less common (and hence less performance-critical) APIs:
  * mutex_lock_interruptible() and mutex_trylock().
@@ -298,13 +294,22 @@ int fastcall __sched mutex_lock_interruptible(struct mutex *lock)
 
 EXPORT_SYMBOL(mutex_lock_interruptible);
 
+static void fastcall noinline __sched
+__mutex_lock_slowpath(atomic_t *lock_count)
+{
+       struct mutex *lock = container_of(lock_count, struct mutex, count);
+
+       __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, 0, _RET_IP_);
+}
+
 static int fastcall noinline __sched
 __mutex_lock_interruptible_slowpath(atomic_t *lock_count)
 {
        struct mutex *lock = container_of(lock_count, struct mutex, count);
 
-       return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, 0);
+       return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, 0, _RET_IP_);
 }
+#endif
 
 /*
  * Spinlock based trylock, we take the spinlock and check whether we