From: Eric Dumazet <edumazet@google.com>
Date: Wed, 1 Oct 2014 22:27:15 +0000 (-0700)
Subject: net: avoid one atomic operation in skb_clone()
X-Git-Tag: fixes-against-v3.18-rc2~144^2~71
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ce1a4ea3f125863bfbcb1afb76590ee2b7b93fbf;p=pandora-kernel.git

net: avoid one atomic operation in skb_clone()

Fast clone cloning can actually avoid an atomic_inc(), if we
guarantee prior clone_ref value is 1.

This requires a change kfree_skbmem(), to perform the
atomic_dec_and_test() on clone_ref before setting fclone to
SKB_FCLONE_UNAVAILABLE.

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