54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/*
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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 <mingo@redhat.com>
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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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