memtype_reserve
extern int memtype_reserve(u64 start, u64 end,
retval = memtype_reserve(phys_addr, (u64)phys_addr + size,
ret = memtype_reserve(start, end, req_type, &new_type);
ret = memtype_reserve(paddr, paddr + size, want_pcm, &pcm);
ret = memtype_reserve(__pa(addr), __pa(addr) + numpages * PAGE_SIZE,
ret = memtype_reserve(__pa(addr), __pa(addr) + numpages * PAGE_SIZE,
if (memtype_reserve(start, end, new_type, NULL))