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kfifo: provide kfifo_is_empty_spinlocked()

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Provide two spinlocked versions of kfifo_is_empty() to be used with
spinlocked variants of kfifo_in() and kfifo_out().

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Stefani Seibold <stefani@seibold.net>
This commit is contained in:
Bartosz Golaszewski 2019-12-17 11:30:59 +01:00
parent 3f2e4c11e1
commit 5195a89e85
1 changed files with 31 additions and 0 deletions
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31
include/linux/kfifo.h
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@ -246,6 +246,37 @@ __kfifo_int_must_check_helper(int val)
__tmpq->kfifo.in == __tmpq->kfifo.out; \
})
/**
* kfifo_is_empty_spinlocked - returns true if the fifo is empty using
* a spinlock for locking
* @fifo: address of the fifo to be used
* @lock: spinlock to be used for locking
*/
#define kfifo_is_empty_spinlocked(fifo, lock) \
({ \
unsigned long __flags; \
bool __ret; \
spin_lock_irqsave(lock, __flags); \
__ret = kfifo_is_empty(fifo); \
spin_unlock_irqrestore(lock, __flags); \
__ret; \
})
/**
* kfifo_is_empty_spinlocked_noirqsave - returns true if the fifo is empty
* using a spinlock for locking, doesn't disable interrupts
* @fifo: address of the fifo to be used
* @lock: spinlock to be used for locking
*/
#define kfifo_is_empty_spinlocked_noirqsave(fifo, lock) \
({ \
bool __ret; \
spin_lock(lock); \
__ret = kfifo_is_empty(fifo); \
spin_unlock(lock); \
__ret; \
})
/**
* kfifo_is_full - returns true if the fifo is full
* @fifo: address of the fifo to be used