_PAGE_OFFSET
#define PAGE_OFFSET (_PAGE_OFFSET(VA_BITS))
#define VMEMMAP_UNUSED_NPAGES ((_PAGE_OFFSET(vabits_actual) - PAGE_OFFSET) >> PAGE_SHIFT)
s64 linear_region_size = PAGE_END - _PAGE_OFFSET(vabits_actual);
memstart_addr -= _PAGE_OFFSET(vabits_actual) - _PAGE_OFFSET(52);
return (addr & ~_PAGE_OFFSET(vabits)) >> (shift + PAGE_SHIFT);
pgd_index(_PAGE_OFFSET(VA_BITS_MIN)) != PTRS_PER_PGD - 1);
phys_addr_t start_linear_pa = __pa(_PAGE_OFFSET(vabits_actual));
unsigned long lstart = _PAGE_OFFSET(vabits_actual);
{_PAGE_OFFSET(vabits_actual), ~0UL},
u64 page_offset = _PAGE_OFFSET(vabits_actual);