From: Eric Dumazet <edumazet@google.com>
Date: Mon, 22 Sep 2014 23:29:32 +0000 (-0700)
Subject: net: introduce __skb_header_release()
X-Git-Tag: fixes-against-v3.18-rc2~144^2~142
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f4a775d14489a801a5b8b0540e23ab82e2703091;p=pandora-kernel.git

net: introduce __skb_header_release()

While profiling TCP stack, I noticed one useless atomic operation
in tcp_sendmsg(), caused by skb_header_release().

It turns out all current skb_header_release() users have a fresh skb,
that no other user can see, so we can avoid one atomic operation.

Introduce __skb_header_release() to clearly document this.

This gave me a 1.5 % improvement on TCP_RR workload.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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