> struct skb_shared_info {
> + unsigned short _unused;
> unsigned char nr_frags;
This makes _all_ fields to be accessed with offset, but if you move
padding down, at least ->nr_frags will enjoy clean and simple [R64]
addressing.
On allyesconfig-ish kernel:
before: +542 = 720-178
after: -158 = 53-211 (negative, because 16-bit field became 32-bit)
You may want to add configurable redzone there instead of padding
if that what you want. 2 bytes is nothing.
