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arp: make arp_hdr_len() return unsigned int

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Negative ARP header length are not a thing.

Constify arguments while I'm at it.

Space savings:

	add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-3 (-3)
	function                        old     new   delta
	arpt_do_table                  1163    1160      -3

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Dobriyan
2017-09-26 23:12:28 +03:00
committed by David S. Miller
parent bbdc9e687f
commit 6ade97da60
2 changed files with 3 additions and 2 deletions
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2
include/linux/if_arp.h
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@@ -31,7 +31,7 @@ static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
return (struct arphdr *)skb_network_header(skb);
}
static inline int arp_hdr_len(struct net_device *dev)
static inline unsigned int arp_hdr_len(const struct net_device *dev)
{
switch (dev->type) {
#if IS_ENABLED(CONFIG_FIREWIRE_NET)