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54 lines
1.5 KiB
54 lines
1.5 KiB
/* |
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* Mutexes: blocking mutual exclusion locks |
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* |
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* started by Ingo Molnar: |
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* |
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* Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <[email protected]> |
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* |
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* This file contains mutex debugging related internal prototypes, for the |
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* !CONFIG_DEBUG_MUTEXES case. Most of them are NOPs: |
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*/ |
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#define spin_lock_mutex(lock, flags) \ |
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do { spin_lock(lock); (void)(flags); } while (0) |
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#define spin_unlock_mutex(lock, flags) \ |
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do { spin_unlock(lock); (void)(flags); } while (0) |
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#define mutex_remove_waiter(lock, waiter, task) \ |
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__list_del((waiter)->list.prev, (waiter)->list.next) |
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#ifdef CONFIG_MUTEX_SPIN_ON_OWNER |
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/* |
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* The mutex owner can get read and written to locklessly. |
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* We should use WRITE_ONCE when writing the owner value to |
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* avoid store tearing, otherwise, a thread could potentially |
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* read a partially written and incomplete owner value. |
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*/ |
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static inline void mutex_set_owner(struct mutex *lock) |
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{ |
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WRITE_ONCE(lock->owner, current); |
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} |
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static inline void mutex_clear_owner(struct mutex *lock) |
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{ |
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WRITE_ONCE(lock->owner, NULL); |
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} |
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#else |
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static inline void mutex_set_owner(struct mutex *lock) |
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{ |
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} |
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static inline void mutex_clear_owner(struct mutex *lock) |
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{ |
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} |
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#endif |
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#define debug_mutex_wake_waiter(lock, waiter) do { } while (0) |
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#define debug_mutex_free_waiter(waiter) do { } while (0) |
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#define debug_mutex_add_waiter(lock, waiter, ti) do { } while (0) |
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#define debug_mutex_unlock(lock) do { } while (0) |
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#define debug_mutex_init(lock, name, key) do { } while (0) |
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static inline void |
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debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter) |
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{ |
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}
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