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kfifo: add kfifo_initialized

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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>
This commit is contained in:
Andi Kleen 2010-01-15 17:01:17 -08:00 committed by Linus Torvalds
parent a5b9e2c106
commit d994ffc247
1 changed files with 10 additions and 0 deletions
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10
include/linux/kfifo.h
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@ -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