// SPDX-License-Identifier: GPL-2.0-only
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#ifndef __LINUX_RWLOCK_TYPES_RT_H
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#define __LINUX_RWLOCK_TYPES_RT_H
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#ifndef __LINUX_SPINLOCK_TYPES_H
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#error "Do not include directly. Include spinlock_types.h instead"
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
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#else
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# define RW_DEP_MAP_INIT(lockname)
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#endif
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typedef struct rt_rw_lock rwlock_t;
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#define __RW_LOCK_UNLOCKED(name) __RWLOCK_RT_INITIALIZER(name)
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#define DEFINE_RWLOCK(name) \
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rwlock_t name = __RW_LOCK_UNLOCKED(name)
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/*
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* A reader biased implementation primarily for CPU pinning.
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*
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* Can be selected as general replacement for the single reader RT rwlock
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* variant
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*/
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struct rt_rw_lock {
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struct rt_mutex rtmutex;
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atomic_t readers;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map dep_map;
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#endif
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};
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#define READER_BIAS (1U << 31)
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#define WRITER_BIAS (1U << 30)
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#define __RWLOCK_RT_INITIALIZER(name) \
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{ \
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.readers = ATOMIC_INIT(READER_BIAS), \
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.rtmutex = __RT_MUTEX_INITIALIZER_SAVE_STATE(name.rtmutex), \
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RW_DEP_MAP_INIT(name) \
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}
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void __rwlock_biased_rt_init(struct rt_rw_lock *lock, const char *name,
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struct lock_class_key *key);
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#define rwlock_biased_rt_init(rwlock) \
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do { \
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static struct lock_class_key __key; \
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\
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__rwlock_biased_rt_init((rwlock), #rwlock, &__key); \
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} while (0)
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#endif
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