PIN_OFFSET_GUARD
flags |= PIN_OFFSET_GUARD | (guard * I915_GTT_PAGE_SIZE);
if (flags & PIN_OFFSET_GUARD &&
GEM_BUG_ON(hweight64(flags & (PIN_OFFSET_GUARD | PIN_OFFSET_FIXED | PIN_OFFSET_BIAS)) > 1);
if (flags & PIN_OFFSET_GUARD) {