linux-kernel - [PATCH 2/2] Add "const" attribute to kfifo input buffer pointers

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Date:	Fri, 14 Aug 2009 13:02:54 -0700
From:	David VomLehn <dvomlehn@...co.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, greg@...ah.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] Add "const" attribute to kfifo input buffer pointers

Change the input buffer arguments for kfifo_put() and __kfifo_put() to have
the "const" attribute.

Signed-off-by: David VomLehn
diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h
index 29f62e1..38d4578 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 +77,8 @@ 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..1082952 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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