ZT_SIG_CONTEXT_SIZE
ZT_SIG_CONTEXT_SIZE(1));
__put_user_error(round_up(ZT_SIG_CONTEXT_SIZE(1), 16),
if (user->zt_size != ZT_SIG_CONTEXT_SIZE(1))
if (zt->head.size != ZT_SIG_CONTEXT_SIZE(zt->nregs)) {