From c2aa270ad73d385bd6cdebf5d741bdf18a3e17ad Mon Sep 17 00:00:00 2001 From: Ilpo Järvinen Date: Thu, 27 Mar 2008 17:52:40 -0700 Subject: [NET]: uninline skb_push, de-bloats a lot MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Allyesconfig (v2.6.24-mm1): -21593 356 funcs, 2418 +, 24011 -, diff: -21593 --- skb_push Without many debug related CONFIGs (v2.6.25-rc2-mm1): -13890 341 funcs, 189 +, 14079 -, diff: -13890 --- skb_push skb_push | +46 Signed-off-by: Ilpo Järvinen Signed-off-by: David S. Miller --- net/core/skbuff.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'net/core') diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 0daf5c0e5b8d..a37127b5899c 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -896,6 +896,25 @@ unsigned char *skb_put(struct sk_buff *skb, unsigned int len) } EXPORT_SYMBOL(skb_put); +/** + * skb_push - add data to the start of a buffer + * @skb: buffer to use + * @len: amount of data to add + * + * This function extends the used data area of the buffer at the buffer + * start. If this would exceed the total buffer headroom the kernel will + * panic. A pointer to the first byte of the extra data is returned. + */ +unsigned char *skb_push(struct sk_buff *skb, unsigned int len) +{ + skb->data -= len; + skb->len += len; + if (unlikely(skb->datahead)) + skb_under_panic(skb, len, __builtin_return_address(0)); + return skb->data; +} +EXPORT_SYMBOL(skb_push); + /** * skb_pull - remove data from the start of a buffer * @skb: buffer to use -- cgit v1.2.3