kfifo: provide noirqsave variants of spinlocked in and out helpers (3f2e4c11) · Commits · 戴 / test

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)

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