On Wed, Jan 31, 2024 at 01:47:33AM +0000, Joe Damato wrote: > +struct epoll_params { > + __aligned_u64 busy_poll_usecs; > + __u16 busy_poll_budget; > + > + /* pad the struct to a multiple of 64bits for alignment on all arches */ > + __u8 __pad[6]; You HAVE to check this padding to be sure it is all 0, otherwise it can never be used in the future for anything. thanks, greg k-h