net: make struct dst_entry::dev first member

struct dst_entry::dev is used most often. Move it so it can be
accessed without imm8 offset on x86_64.

	add/remove: 0/0 grow/shrink: 9/239 up/down: 52/-413 (-361)
	function                                     old     new   delta
	dst_rcu_free                                 126     138     +12
	fnhe_flush_routes                            211     219      +8
	rt_set_nexthop                               747     754      +7
	rt_cache_route                                85      91      +6
	rt6_release                                  209     215      +6
	dst_release                                  107     111      +4
	dst_destroy_rcu                               29      33      +4
	dn_dst_check_expire                          329     333      +4
	dn_insert_route                              484     485      +1
	xfrm_resolve_and_create_bundle              2991    2990      -1
					...
	ip_route_me_harder                          1163    1157      -6
	__ip_append_data.isra                       2730    2724      -6
	ip6_forward                                 3052    3045      -7
	callforward_do_filter                        659     651      -8
	dst_gc_task                                  571     549     -22

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/dst.h b/include/net/dst.h
index 049af33da3b6c95897d544670cea65c542317673..755a0eedffdefadc5f505f43f79186800cac24bb 100644 (file)
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -31,9 +31,9 @@
 struct sk_buff;
 
 struct dst_entry {
+       struct net_device       *dev;
        struct rcu_head         rcu_head;
        struct dst_entry        *child;
-       struct net_device       *dev;
        struct  dst_ops         *ops;
        unsigned long           _metrics;
        unsigned long           expires;