DW_PER_PAGE
for (m = 0; m < DW_PER_PAGE; m++)
for (; m < DW_PER_PAGE; m++) {
size = min(vm->total / 2, 1024ull * DW_PER_PAGE * PAGE_SIZE);
size = round_down(size, DW_PER_PAGE * PAGE_SIZE);
obj = huge_gem_object(vm->i915, DW_PER_PAGE * PAGE_SIZE, size);
GEM_BUG_ON(!IS_ALIGNED(npages, DW_PER_PAGE));
return npages / DW_PER_PAGE;