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net: make struct net_device::min_header_len 8-bit 

This field is never big enough to warrant 16-bitness.

8-bit accesses enjoy shorted encoding on i386/x86_64 than 16-bit
accesses:

	add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-10 (-10)
	function                                     old     new   delta
	loopback_setup                               169     164      -5
	ether_setup                                  148     143      -5

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Dobriyan 2017-04-10 11:25:26 +03:00 committed by David S. Miller
parent 5b3dc2f37d
commit d92be7a41e
1 changed files with 1 additions and 1 deletions
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2
include/linux/netdevice.h
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@ -1715,7 +1715,7 @@ struct net_device {
unsigned int max_mtu;
unsigned short type;
unsigned short hard_header_len;
unsigned short min_header_len;
unsigned char min_header_len;
unsigned short needed_headroom;
unsigned short needed_tailroom;