linux-kernel - [PATCH] kfifo: Use "const" definitions

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Date:	Thu, 25 Jun 2009 15:34:54 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] kfifo: Use "const" definitions

From: Alan Cox <alan@...ux.intel.com>

Currently kfifo cannot be used by parts of the kernel that use "const"
properly as kfifo itself does not use const for passed data blocks which
are indeed const.

Signed-off-by: Alan Cox <alan@...ux.intel.com>
---

 include/linux/kfifo.h |    4 ++--
 kernel/kfifo.c        |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)


diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h
index 29f62e1..ad6bdf5 100644
--- a/include/linux/kfifo.h
+++ b/include/linux/kfifo.h
@@ -38,7 +38,7 @@ extern struct kfifo *kfifo_alloc(unsigned int size, gfp_t gfp_mask,
 				 spinlock_t *lock);
 extern void kfifo_free(struct kfifo *fifo);
 extern unsigned int __kfifo_put(struct kfifo *fifo,
-				unsigned char *buffer, unsigned int len);
+				const unsigned char *buffer, unsigned int len);
 extern unsigned int __kfifo_get(struct kfifo *fifo,
 				unsigned char *buffer, unsigned int len);
 
@@ -77,7 +77,7 @@ static inline void kfifo_reset(struct kfifo *fifo)
  * bytes copied.
  */
 static inline unsigned int kfifo_put(struct kfifo *fifo,
-				     unsigned char *buffer, unsigned int len)
+				const unsigned char *buffer, unsigned int len)
 {
 	unsigned long flags;
 	unsigned int ret;
diff --git a/kernel/kfifo.c b/kernel/kfifo.c
index 26539e3..3765ff3 100644
--- a/kernel/kfifo.c
+++ b/kernel/kfifo.c
@@ -117,7 +117,7 @@ EXPORT_SYMBOL(kfifo_free);
  * writer, you don't need extra locking to use these functions.
  */
 unsigned int __kfifo_put(struct kfifo *fifo,
-			 unsigned char *buffer, unsigned int len)
+			const unsigned char *buffer, unsigned int len)
 {
 	unsigned int l;
 

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