AN_CACHE_ALIGN_LOG2
(AP)->an_vp = swapfs_getvp(((uintptr_t)(AP) >> AN_CACHE_ALIGN_LOG2) \
AN_VPSHIFT + AN_CACHE_ALIGN_LOG2) << PAGESHIFT); \
#define AN_CACHE_ALIGN (1U << AN_CACHE_ALIGN_LOG2) /* anon address aligned */