Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] [5/6] kfifo: Add kfifo_initialized | Date | Sun, 27 Dec 2009 22:03:15 +0100 (CET) |
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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>
--- include/linux/kfifo.h | 10 ++++++++++ 1 file changed, 10 insertions(+)
Index: linux/include/linux/kfifo.h =================================================================== --- linux.orig/include/linux/kfifo.h +++ linux/include/linux/kfifo.h @@ -117,6 +117,16 @@ extern __must_check unsigned int kfifo_o 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
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