Commit d994ffc2 authored Jan 15, 2010 by Andi Kleen Committed by Linus Torvalds Jan 16, 2010

kfifo: add kfifo_initialized



Simple inline that checks if kfifo_init() has been executed on a fifo.

This is useful for walking all per CPU fifos, when some of them might not
have been brought up yet.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Stefani Seibold <stefani@seibold.net>
Cc: Roland Dreier <rdreier@cisco.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Andy Walls <awalls@radix.net>
Cc: Vikram Dhillon <dhillonv10@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent a5b9e2c1

include/linux/kfifo.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -116,6 +116,16 @@ extern __must_check unsigned int kfifo_out(struct kfifo *fifo,
		extern __must_check unsigned int kfifo_out_peek(struct kfifo *fifo,
		void *to, unsigned int len, unsigned offset);

		/**
		* kfifo_initialized - Check if kfifo is initialized.
		* @fifo: fifo to check
		* Return %true if FIFO is initialized, otherwise %false.
		* Assumes the fifo was 0 before.
		*/
		static inline bool kfifo_initialized(struct kfifo *fifo)
		{
		return fifo->buffer != 0;
		}

		/**
		* kfifo_reset - removes the entire FIFO contents