resolve_pa_may_alloc
pa = resolve_pa_may_alloc(addr, size, mode);
pa = resolve_pa_may_alloc(addr, size, mode);
entry = __pte(resolve_pa_may_alloc(addr, PAGE_SIZE, mode));
resolve_pa_may_alloc(addr, 0, mode),
resolve_pa_may_alloc(end - 1, 0, mode) + 1);