summaryrefslogtreecommitdiffstats
path: root/net/core/skbuff.c
diff options
context:
space:
mode:
authorIlpo Järvinen <ilpo.jarvinen@helsinki.fi>2008-03-28 01:52:40 +0100
committerDavid S. Miller <davem@davemloft.net>2008-03-28 01:52:40 +0100
commitc2aa270ad73d385bd6cdebf5d741bdf18a3e17ad (patch)
tree1e8de0edce4f149a9918505f495550c8ac9bac56 /net/core/skbuff.c
parent[NET]: uninline dev_alloc_skb, de-bloats a lot (diff)
downloadlinux-c2aa270ad73d385bd6cdebf5d741bdf18a3e17ad.tar.xz
linux-c2aa270ad73d385bd6cdebf5d741bdf18a3e17ad.zip
[NET]: uninline skb_push, de-bloats a lot
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 <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/skbuff.c')
-rw-r--r--net/core/skbuff.c19
1 files changed, 19 insertions, 0 deletions
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
@@ -897,6 +897,25 @@ 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->data<skb->head))
+ 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
* @len: amount of data to remove