rlimit_max
: rlimit_max(RLIMIT_STACK);
long rlimit_max[UCOUNT_RLIMIT_COUNTS];
return READ_ONCE(ns->rlimit_max[type]);
ns->rlimit_max[type] = max <= LONG_MAX ? max : LONG_MAX;
mm->data_vm + npages <= rlimit_max(RLIMIT_DATA) >> PAGE_SHIFT)