forked from mirrors/linux
52e0874fc1
The sleeping locks on PREEMPT_RT (rt_spin_lock() and friends) lack sparse annotation. Therefore a missing spin_unlock() won't be spotted by sparse in a PREEMPT_RT build while it is noticed on a !PREEMPT_RT build. Add the __acquires/__releases macros to the lock/ unlock functions. The trylock functions already use the __cond_lock() wrapper. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20240812104200.2239232-2-bigeasy@linutronix.de
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#ifndef __LINUX_RWLOCK_RT_H
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#define __LINUX_RWLOCK_RT_H
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#ifndef __LINUX_SPINLOCK_RT_H
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#error Do not #include directly. Use <linux/spinlock.h>.
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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extern void __rt_rwlock_init(rwlock_t *rwlock, const char *name,
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struct lock_class_key *key);
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#else
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static inline void __rt_rwlock_init(rwlock_t *rwlock, char *name,
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struct lock_class_key *key)
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{
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}
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#endif
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#define rwlock_init(rwl) \
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do { \
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static struct lock_class_key __key; \
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\
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init_rwbase_rt(&(rwl)->rwbase); \
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__rt_rwlock_init(rwl, #rwl, &__key); \
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} while (0)
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extern void rt_read_lock(rwlock_t *rwlock) __acquires(rwlock);
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extern int rt_read_trylock(rwlock_t *rwlock);
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extern void rt_read_unlock(rwlock_t *rwlock) __releases(rwlock);
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extern void rt_write_lock(rwlock_t *rwlock) __acquires(rwlock);
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extern void rt_write_lock_nested(rwlock_t *rwlock, int subclass) __acquires(rwlock);
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extern int rt_write_trylock(rwlock_t *rwlock);
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extern void rt_write_unlock(rwlock_t *rwlock) __releases(rwlock);
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static __always_inline void read_lock(rwlock_t *rwlock)
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{
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rt_read_lock(rwlock);
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}
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static __always_inline void read_lock_bh(rwlock_t *rwlock)
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{
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local_bh_disable();
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rt_read_lock(rwlock);
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}
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static __always_inline void read_lock_irq(rwlock_t *rwlock)
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{
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rt_read_lock(rwlock);
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}
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#define read_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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rt_read_lock(lock); \
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flags = 0; \
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} while (0)
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#define read_trylock(lock) __cond_lock(lock, rt_read_trylock(lock))
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static __always_inline void read_unlock(rwlock_t *rwlock)
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{
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rt_read_unlock(rwlock);
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}
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static __always_inline void read_unlock_bh(rwlock_t *rwlock)
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{
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rt_read_unlock(rwlock);
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local_bh_enable();
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}
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static __always_inline void read_unlock_irq(rwlock_t *rwlock)
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{
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rt_read_unlock(rwlock);
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}
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static __always_inline void read_unlock_irqrestore(rwlock_t *rwlock,
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unsigned long flags)
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{
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rt_read_unlock(rwlock);
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}
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static __always_inline void write_lock(rwlock_t *rwlock)
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{
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rt_write_lock(rwlock);
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}
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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static __always_inline void write_lock_nested(rwlock_t *rwlock, int subclass)
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{
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rt_write_lock_nested(rwlock, subclass);
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}
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#else
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#define write_lock_nested(lock, subclass) rt_write_lock(((void)(subclass), (lock)))
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#endif
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static __always_inline void write_lock_bh(rwlock_t *rwlock)
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{
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local_bh_disable();
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rt_write_lock(rwlock);
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}
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static __always_inline void write_lock_irq(rwlock_t *rwlock)
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{
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rt_write_lock(rwlock);
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}
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#define write_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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rt_write_lock(lock); \
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flags = 0; \
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} while (0)
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#define write_trylock(lock) __cond_lock(lock, rt_write_trylock(lock))
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#define write_trylock_irqsave(lock, flags) \
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({ \
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int __locked; \
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\
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typecheck(unsigned long, flags); \
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flags = 0; \
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__locked = write_trylock(lock); \
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__locked; \
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})
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static __always_inline void write_unlock(rwlock_t *rwlock)
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{
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rt_write_unlock(rwlock);
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}
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static __always_inline void write_unlock_bh(rwlock_t *rwlock)
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{
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rt_write_unlock(rwlock);
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local_bh_enable();
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}
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static __always_inline void write_unlock_irq(rwlock_t *rwlock)
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{
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rt_write_unlock(rwlock);
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}
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static __always_inline void write_unlock_irqrestore(rwlock_t *rwlock,
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unsigned long flags)
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{
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rt_write_unlock(rwlock);
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}
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#define rwlock_is_contended(lock) (((void)(lock), 0))
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#endif /* __LINUX_RWLOCK_RT_H */
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