__VIRTUAL_MASK    248 arch/x86/include/asm/pgtable_64.h #define	kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
__VIRTUAL_MASK    249 arch/x86/include/asm/pgtable_64.h #define	kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)