kernel/locking/mutex-debug.h

   1 /*
   2  * Mutexes: blocking mutual exclusion locks
   3  *
   4  * started by Ingo Molnar:
   5  *
   6  *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
   7  *
   8  * This file contains mutex debugging related internal declarations,
   9  * prototypes and inline functions, for the CONFIG_DEBUG_MUTEXES case.
  10  * More details are in kernel/mutex-debug.c.
  11  */
  12
  13 /*
  14  * This must be called with lock->wait_lock held.
  15  */
  16 extern void debug_mutex_lock_common(struct mutex *lock,
  17                                     struct mutex_waiter *waiter);
  18 extern void debug_mutex_wake_waiter(struct mutex *lock,
  19                                     struct mutex_waiter *waiter);
  20 extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
  21 extern void debug_mutex_add_waiter(struct mutex *lock,
  22                                    struct mutex_waiter *waiter,
  23                                    struct task_struct *task);
  24 extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
  25                                 struct task_struct *task);
  26 extern void debug_mutex_unlock(struct mutex *lock);
  27 extern void debug_mutex_init(struct mutex *lock, const char *name,
  28                              struct lock_class_key *key);
  29
  30 static inline void mutex_set_owner(struct mutex *lock)
  31 {
  32         WRITE_ONCE(lock->owner, current);
  33 }
  34
  35 static inline void mutex_clear_owner(struct mutex *lock)
  36 {
  37         WRITE_ONCE(lock->owner, NULL);
  38 }
  39
  40 #define spin_lock_mutex(lock, flags)                    \
  41         do {                                            \
  42                 struct mutex *l = container_of(lock, struct mutex, wait_lock); \
  43                                                         \
  44                 DEBUG_LOCKS_WARN_ON(in_interrupt());    \
  45                 local_irq_save(flags);                  \
  46                 arch_spin_lock(&(lock)->rlock.raw_lock);\
  47                 DEBUG_LOCKS_WARN_ON(l->magic != l);     \
  48         } while (0)
  49
  50 #define spin_unlock_mutex(lock, flags)                          \
  51         do {                                                    \
  52                 arch_spin_unlock(&(lock)->rlock.raw_lock);      \
  53                 local_irq_restore(flags);                       \
  54                 preempt_check_resched();                        \
  55         } while (0)