TUNABLE_QUAD_FETCH
if (TUNABLE_QUAD_FETCH(buf, &j))
if (TUNABLE_QUAD_FETCH("hw.physmem", &physmem_tunable))
TUNABLE_QUAD_FETCH("hw.xsave_mask", &xsave_mask_user);
TUNABLE_QUAD_FETCH(d->path, d->var);
TUNABLE_QUAD_FETCH("kern.ipc.maxmbufmem", &maxmbufmem);