DISM_PG_LOCKED
if (!(shmd->shm_vpage[anon_index] & DISM_PG_LOCKED)) {
shmd->shm_vpage[anon_index] |= DISM_PG_LOCKED;
if (shmd->shm_vpage[anon_index] & DISM_PG_LOCKED) {
shmd->shm_vpage[anon_index] &= ~DISM_PG_LOCKED;
if (shmd->shm_vpage[anon_index] & DISM_PG_LOCKED) {