[PATCH] net: neigh: make ->hh_len 32-bit

[Alexey Dobriyan]

Using 16-bit ->hh_len doesn't save any memory, save some .text instead:

        add/remove: 0/0 grow/shrink: 1/6 up/down: 2/-19 (-17)
        function                                     old     new   delta
        neigh_update                                2312    2314      +2
        fwnet_header_cache                           199     197      -2
        eth_header_cache                             101      99      -2
        ip6_finish_output2                          2371    2368      -3
        vrf_finish_output6                          1522    1518      -4
        vrf_finish_output                           1413    1409      -4
        ip_finish_output2                           1627    1623      -4

Signed-off-by: Alexey Dobriyan <adobri...@gmail.com>
---

 include/linux/netdevice.h |    3 +--
 include/net/neighbour.h   |    4 ++--
 2 files changed, 3 insertions(+), 4 deletions(-)

--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -237,8 +237,7 @@ struct netdev_hw_addr_list {
        netdev_hw_addr_list_for_each(ha, &(dev)->mc)
 
 struct hh_cache {
-       u16             hh_len;
-       u16             __pad;
+       unsigned int    hh_len;
        seqlock_t       hh_lock;
 
        /* cached hardware header; allow for machine alignment needs.        */
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -450,7 +450,7 @@ static inline int neigh_hh_bridge(struct hh_cache *hh, 
struct sk_buff *skb)
 static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff 
*skb)
 {
        unsigned int seq;
-       int hh_len;
+       unsigned int hh_len;
 
        do {
                seq = read_seqbegin(&hh->hh_lock);
@@ -459,7 +459,7 @@ static inline int neigh_hh_output(const struct hh_cache 
*hh, struct sk_buff *skb
                        /* this is inlined by gcc */
                        memcpy(skb->data - HH_DATA_MOD, hh->hh_data, 
HH_DATA_MOD);
                } else {
-                       int hh_alen = HH_DATA_ALIGN(hh_len);
+                       unsigned int hh_alen = HH_DATA_ALIGN(hh_len);
 
                        memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
                }