Commit 3f2e4c11 authored by Bartosz Golaszewski's avatar Bartosz Golaszewski
Browse files

kfifo: provide noirqsave variants of spinlocked in and out helpers 



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

Signed-off-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: default avatarStefani Seibold <stefani@seibold.net>
parent 47203198

include/linux/kfifo.h

+42 −0
Original line number Diff line number Diff line
@@ -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)