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kfifo: add kfifo_out_peek

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In some upcoming code it's useful to peek into a FIFO without permanentely
removing data.  This patch implements a new kfifo_out_peek() to do this.

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 17:01:16 -08:00
committed by Linus Torvalds
parent 64ce1037c5
commit a5b9e2c106
2 changed files with 24 additions and 0 deletions
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3
include/linux/kfifo.h
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@ -113,6 +113,9 @@ extern unsigned int kfifo_in(struct kfifo *fifo,
const void *from, unsigned int len);
extern __must_check unsigned int kfifo_out(struct kfifo *fifo,
void *to, unsigned int len);
extern __must_check unsigned int kfifo_out_peek(struct kfifo *fifo,
void *to, unsigned int len, unsigned offset);
/**
* kfifo_reset - removes the entire FIFO contents