__PHYSICAL_MASK_SHIFT
phys_addr_t physical_mask = (1ULL << __PHYSICAL_MASK_SHIFT) - 1;
#define __PHYSICAL_MASK ((phys_addr_t)((1ULL << __PHYSICAL_MASK_SHIFT) - 1))
#define PGD_PAE_PHYS_MASK (((1ULL << __PHYSICAL_MASK_SHIFT)-1) & PGD_PAE_PAGE_MASK)
BUILD_BUG_ON(__PHYSICAL_MASK_SHIFT >
phys_addr_t physical_mask __ro_after_init = (1ULL << __PHYSICAL_MASK_SHIFT) - 1;