zero_checksum     276 mm/ksm.c       static unsigned int zero_checksum __read_mostly;
zero_checksum    2110 mm/ksm.c       	if (ksm_use_zero_pages && (checksum == zero_checksum)) {
zero_checksum    3186 mm/ksm.c       	zero_checksum = calc_checksum(ZERO_PAGE(0));