Re: + net-uninline-skb_put.patch added to -mm tree

[David Miller <davem@davemloft.net>]

From: akpm@osdl.org
Date: Fri, 03 Nov 2006 14:18:29 -0800

> Subject: net: uninline skb_put()
> From: Andrew Morton <akpm@osdl.org>
> 
> It has 34 callsites for a total of 2650 bytes.
> 
> Cc: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
> Signed-off-by: Andrew Morton <akpm@osdl.org>

A more accurate figure would probably be:

davem@sunset:~/src/GIT/net-2.6$ git grep skb_put | grep -v __skb_put | wc -l
1167

:-)

Half of the cost of this interface are the assertions, which while
useful are obviously over the top for such an oft-used routine in
packet processing.

Without the assertion checks it's merely:

	unsigned char *tmp = skb->tail;
	skb->tail += len;
	skb->len  += len;
	return tmp;

And even with 1167 call sites that is definitely something which
should be inlined.