MM_CID_UNSET
.mm_cid = { .cid = MM_CID_UNSET, },
tsk->mm_cid.cid = MM_CID_UNSET;
WARN_ON_ONCE(t->mm_cid.cid != MM_CID_UNSET);
t->mm_cid.cid = MM_CID_UNSET;
return MM_CID_UNSET;
return MM_CID_UNSET;
while (cid == MM_CID_UNSET) {
if (new_cid != MM_CID_UNSET) {
prev->mm_cid.cid = MM_CID_UNSET;