linux-kernel - [PATCH 1/2] kfifo: implement missing __kfifo_skip

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Message-Id: <1281627158-9461-1-git-send-email-arighi@develer.com>
Date:	Thu, 12 Aug 2010 17:32:37 +0200
From:	Andrea Righi <arighi@...eler.com>
To:	Stefani Seibold <stefani@...bold.net>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] kfifo: implement missing __kfifo_skip_r()

kfifo_skip() is currently broken, due to the missing of the internal
helper function. Add it.

Signed-off-by: Andrea Righi <arighi@...eler.com>
---
 include/linux/kfifo.h |    2 ++
 kernel/kfifo.c        |    9 +++++++++
 2 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h
index 311f875..4aa95f2 100644
--- a/include/linux/kfifo.h
+++ b/include/linux/kfifo.h
@@ -836,6 +836,8 @@ extern void __kfifo_dma_out_finish_r(struct __kfifo *fifo, size_t recsize);
 
 extern unsigned int __kfifo_len_r(struct __kfifo *fifo, size_t recsize);
 
+extern void __kfifo_skip_r(struct __kfifo *fifo, size_t recsize);
+
 extern unsigned int __kfifo_out_peek_r(struct __kfifo *fifo,
 	void *buf, unsigned int len, size_t recsize);
 
diff --git a/kernel/kfifo.c b/kernel/kfifo.c
index 02192dd..06d6eee 100644
--- a/kernel/kfifo.c
+++ b/kernel/kfifo.c
@@ -504,6 +504,15 @@ unsigned int __kfifo_out_r(struct __kfifo *fifo, void *buf,
 }
 EXPORT_SYMBOL(__kfifo_out_r);
 
+void __kfifo_skip_r(struct __kfifo *fifo, size_t recsize)
+{
+	unsigned int n;
+
+	n = __kfifo_peek_n(fifo, recsize);
+	fifo->out += n + recsize;
+}
+EXPORT_SYMBOL(__kfifo_skip_r);
+
 int __kfifo_from_user_r(struct __kfifo *fifo, const void __user *from,
 	unsigned long len, unsigned int *copied, size_t recsize)
 {
-- 
1.7.0.4

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