netdev - [RFC PATCH 1/8] [NET]: uninline skb

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Date:	Wed, 20 Feb 2008 15:47:11 +0200
From:	"Ilpo JÃ¤rvinen" <ilpo.jarvinen@...sinki.fi>
To:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	David Miller <davem@...emloft.net>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Subject: [RFC PATCH 1/8] [NET]: uninline skb_put, de-bloats a lot

~500 files changed
...
kernel/uninlined.c:
  skb_put                       | +104
 1 function changed, 104 bytes added, diff: +104

vmlinux.o:
 869 functions changed, 198 bytes added, 111003 bytes removed, diff: -110805

This change is INCOMPLETE, I think that the call to current_text_addr()
should be rethought but I don't have a clue how to do that.

Signed-off-by: Ilpo JÃ¤rvinen <ilpo.jarvinen@...sinki.fi>
---
 include/linux/skbuff.h |   20 +-------------------
 net/core/skbuff.c      |   21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 19 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 412672a..5925435 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -896,25 +896,7 @@ static inline unsigned char *__skb_put(struct sk_buff *skb, unsigned int len)
 	return tmp;
 }
 
-/**
- *	skb_put - add data to a buffer
- *	@skb: buffer to use
- *	@len: amount of data to add
- *
- *	This function extends the used data area of the buffer. If this would
- *	exceed the total buffer size the kernel will panic. A pointer to the
- *	first byte of the extra data is returned.
- */
-static inline unsigned char *skb_put(struct sk_buff *skb, unsigned int len)
-{
-	unsigned char *tmp = skb_tail_pointer(skb);
-	SKB_LINEAR_ASSERT(skb);
-	skb->tail += len;
-	skb->len  += len;
-	if (unlikely(skb->tail > skb->end))
-		skb_over_panic(skb, len, current_text_addr());
-	return tmp;
-}
+extern unsigned char *skb_put(struct sk_buff *skb, unsigned int len);
 
 static inline unsigned char *__skb_push(struct sk_buff *skb, unsigned int len)
 {
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 4e35422..661d439 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -857,6 +857,27 @@ free_skb:
 	return err;
 }
 
+/**
+ *	skb_put - add data to a buffer
+ *	@skb: buffer to use
+ *	@len: amount of data to add
+ *
+ *	This function extends the used data area of the buffer. If this would
+ *	exceed the total buffer size the kernel will panic. A pointer to the
+ *	first byte of the extra data is returned.
+ */
+unsigned char *skb_put(struct sk_buff *skb, unsigned int len)
+{
+	unsigned char *tmp = skb_tail_pointer(skb);
+	SKB_LINEAR_ASSERT(skb);
+	skb->tail += len;
+	skb->len  += len;
+	if (unlikely(skb->tail > skb->end))
+		skb_over_panic(skb, len, current_text_addr());
+	return tmp;
+}
+EXPORT_SYMBOL(skb_put);
+
 /* Trims skb to length len. It can change skb pointers.
  */
 
-- 
1.5.2.2

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