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authorAndi Kleen <andi@firstfloor.org>2010-01-15 17:01:16 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-01-16 12:15:38 -0800
commita5b9e2c1063046421ce01dcf5ddd7ec12567f3e1 (patch)
tree09cef2a043af96491497db380abe89af2aee5176 /include
parent64ce1037c5434b1d036cd99ecaee6e00496bc2e9 (diff)
downloadlinux-linaro-android-a5b9e2c1063046421ce01dcf5ddd7ec12567f3e1.tar.gz
kfifo: add kfifo_out_peek
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kfifo.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h
index 86ad50a900c..7ad6d32dd67 100644
--- a/include/linux/kfifo.h
+++ b/include/linux/kfifo.h
@@ -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