[HMM 07/15] mm/hmm: heterogeneous memory management (HMM for short) v2

HMM provides 3 separate types of functionality: - Mirroring: synchronize CPU page table and device page table - Device memory: allocating struct page for device memory - Migration: migrating regular memory to device memory This patch introduces some common helpers and definitions to

[HMM 07/15] mm/hmm: heterogeneous memory management (HMM for short) v2

HMM provides 3 separate types of functionality: - Mirroring: synchronize CPU page table and device page table - Device memory: allocating struct page for device memory - Migration: migrating regular memory to device memory This patch introduces some common helpers and definitions to