Merge branch 'v2.6.24-rc7-lockdep' of git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-lockdep

* 'v2.6.24-rc7-lockdep' of git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-lockdep:
lockdep: more hardirq annotations for notify_die()
lockdep: fix workqueue creation API lockdep interaction
lockdep: fix internal double unlock during self-test

arch/x86/kernel/traps_32.c

···
 	info.si_errno = 0; \
 	info.si_code = sicode; \
 	info.si_addr = (void __user *)siaddr; \
+	trace_hardirqs_fixup(); \
 	if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
 						== NOTIFY_STOP) \
 		return; \

arch/x86/kernel/traps_64.c

···
 	info.si_errno = 0; \
 	info.si_code = sicode; \
 	info.si_addr = (void __user *)siaddr; \
+	trace_hardirqs_fixup(); \
 	if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
 							== NOTIFY_STOP) \
 		return; \

include/linux/workqueue.h

···
 
 extern struct workqueue_struct *
 __create_workqueue_key(const char *name, int singlethread,
-		       int freezeable, struct lock_class_key *key);
+		       int freezeable, struct lock_class_key *key,
+		       const char *lock_name);
 
 #ifdef CONFIG_LOCKDEP
 #define __create_workqueue(name, singlethread, freezeable)	\
 ({								\
 	static struct lock_class_key __key;			\
+	const char *__lock_name;				\
+								\
+	if (__builtin_constant_p(name))				\
+		__lock_name = (name);				\
+	else							\
+		__lock_name = #name;				\
 								\
 	__create_workqueue_key((name), (singlethread),		\
-			       (freezeable), &__key);		\
+			       (freezeable), &__key,		\
+			       __lock_name);			\
 })
 #else
 #define __create_workqueue(name, singlethread, freezeable)	\
-	__create_workqueue_key((name), (singlethread), (freezeable), NULL)
+	__create_workqueue_key((name), (singlethread), (freezeable), NULL, NULL)
 #endif
 
 #define create_workqueue(name) __create_workqueue((name), 0, 0)

kernel/lockdep.c

···
 	struct list_head *head;
 	unsigned long flags;
 	int i;
+	int locked;
 
 	raw_local_irq_save(flags);
-	graph_lock();
+	locked = graph_lock();
 
 	/*
 	 * Unhash all classes that were created by this module:
···
 				zap_class(class);
 	}
 
-	graph_unlock();
+	if (locked)
+		graph_unlock();
 	raw_local_irq_restore(flags);
 }
 
···
 	struct list_head *head;
 	unsigned long flags;
 	int i, j;
+	int locked;
 
 	raw_local_irq_save(flags);
 
···
 	 * Debug check: in the end all mapped classes should
 	 * be gone.
 	 */
-	graph_lock();
+	locked = graph_lock();
 	for (i = 0; i < CLASSHASH_SIZE; i++) {
 		head = classhash_table + i;
 		if (list_empty(head))
···
 			}
 		}
 	}
-	graph_unlock();
+	if (locked)
+		graph_unlock();
 
 out_restore:
 	raw_local_irq_restore(flags);

kernel/workqueue.c

···
 struct workqueue_struct *__create_workqueue_key(const char *name,
 						int singlethread,
 						int freezeable,
-						struct lock_class_key *key)
+						struct lock_class_key *key,
+						const char *lock_name)
 {
 	struct workqueue_struct *wq;
 	struct cpu_workqueue_struct *cwq;
···
 	}
 
 	wq->name = name;
-	lockdep_init_map(&wq->lockdep_map, name, key, 0);
+	lockdep_init_map(&wq->lockdep_map, lock_name, key, 0);
 	wq->singlethread = singlethread;
 	wq->freezeable = freezeable;
 	INIT_LIST_HEAD(&wq->list);