mmap_legacy_base
*legacy_base = mmap_legacy_base(random_factor, task_size);
arch_pick_mmap_base(&mm->mmap_base, &mm->mmap_legacy_base,
return is_legacy ? mm->mmap_legacy_base : mm->mmap_base;
unsigned long mmap_legacy_base; /* base of mmap area in bottom-up allocations */
mm->mmap_base, mm->mmap_legacy_base,