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kfifo: provide noirqsave variants of spinlocked in and out helpers

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Provide variants of spinlocked kfifo_in() and kfifo_out() routines which
don't disable interrupts.

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 18:48:55 +01:00
parent 47203198ed
commit 3f2e4c11e1
1 changed files with 42 additions and 0 deletions
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42
include/linux/kfifo.h
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@ -517,6 +517,26 @@ __kfifo_uint_must_check_helper( \
__ret; \
})
/**
* kfifo_in_spinlocked_noirqsave - put data into fifo using a spinlock for
* locking, don't disable interrupts
* @fifo: address of the fifo to be used
* @buf: the data to be added
* @n: number of elements to be added
* @lock: pointer to the spinlock to use for locking
*
* This is a variant of kfifo_in_spinlocked() but uses spin_lock/unlock()
* for locking and doesn't disable interrupts.
*/
#define kfifo_in_spinlocked_noirqsave(fifo, buf, n, lock) \
({ \
unsigned int __ret; \
spin_lock(lock); \
__ret = kfifo_in(fifo, buf, n); \
spin_unlock(lock); \
__ret; \
})
/* alias for kfifo_in_spinlocked, will be removed in a future release */
#define kfifo_in_locked(fifo, buf, n, lock) \
kfifo_in_spinlocked(fifo, buf, n, lock)
@ -569,6 +589,28 @@ __kfifo_uint_must_check_helper( \
}) \
)
/**
* kfifo_out_spinlocked_noirqsave - get data from the fifo using a spinlock
* for locking, don't disable interrupts
* @fifo: address of the fifo to be used
* @buf: pointer to the storage buffer
* @n: max. number of elements to get
* @lock: pointer to the spinlock to use for locking
*
* This is a variant of kfifo_out_spinlocked() which uses spin_lock/unlock()
* for locking and doesn't disable interrupts.
*/
#define kfifo_out_spinlocked_noirqsave(fifo, buf, n, lock) \
__kfifo_uint_must_check_helper( \
({ \
unsigned int __ret; \
spin_lock(lock); \
__ret = kfifo_out(fifo, buf, n); \
spin_unlock(lock); \
__ret; \
}) \
)
/* alias for kfifo_out_spinlocked, will be removed in a future release */
#define kfifo_out_locked(fifo, buf, n, lock) \
kfifo_out_spinlocked(fifo, buf, n, lock)