net: don't reallocate skb->head unless the current one hasn't the needed extra size or is shared
skb head being allocated by kmalloc(), it might be larger than what actually requested because of discrete kmem caches sizes. Before reallocating a new skb head, check if the current one has the needed extra size. Do this check only if skb head is not shared. Signed-off-by: NChangli Gao <xiaosuo@gmail.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: NEric Dumazet <eric.dumazet@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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