| 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 thread_info *ti); |
| 24 | extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter, |
| 25 | struct thread_info *ti); |
| 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 | lock->owner = current; |
| 33 | } |
| 34 | |
| 35 | static inline void mutex_clear_owner(struct mutex *lock) |
| 36 | { |
| 37 | lock->owner = NULL; |
| 38 | } |
| 39 | #include <linux/aee.h> |
| 40 | #define MT_DEBUG_LOCKS_WARN_ON(c) \ |
| 41 | ({ \ |
| 42 | int __ret = 0; \ |
| 43 | \ |
| 44 | if (!oops_in_progress && unlikely(c)) { \ |
| 45 | aee_kernel_warning(#c,"Mutex Debug\n");\ |
| 46 | if (debug_locks_off() && !debug_locks_silent) \ |
| 47 | WARN_ON(1); \ |
| 48 | else \ |
| 49 | dump_stack();\ |
| 50 | __ret = 1; \ |
| 51 | } \ |
| 52 | __ret; \ |
| 53 | }) |
| 54 | |
| 55 | #ifdef DEBUG_LOCKS_WARN_ON |
| 56 | #undef DEBUG_LOCKS_WARN_ON |
| 57 | #define DEBUG_LOCKS_WARN_ON(c) MT_DEBUG_LOCKS_WARN_ON(c) |
| 58 | #endif |
| 59 | |
| 60 | #define spin_lock_mutex(lock, flags) \ |
| 61 | do { \ |
| 62 | struct mutex *l = container_of(lock, struct mutex, wait_lock); \ |
| 63 | \ |
| 64 | if(DEBUG_LOCKS_WARN_ON(in_interrupt())){ \ |
| 65 | printk("[MUTEX WARN!!] mutex lock in interrupt context!\n");\ |
| 66 | }\ |
| 67 | local_irq_save(flags); \ |
| 68 | arch_spin_lock(&(lock)->rlock.raw_lock);\ |
| 69 | DEBUG_LOCKS_WARN_ON(l->magic != l); \ |
| 70 | } while (0) |
| 71 | |
| 72 | #define spin_unlock_mutex(lock, flags) \ |
| 73 | do { \ |
| 74 | arch_spin_unlock(&(lock)->rlock.raw_lock); \ |
| 75 | local_irq_restore(flags); \ |
| 76 | preempt_check_resched(); \ |
| 77 | } while (0) |