MAX_ARCH_PFN     1047 arch/x86/kernel/e820.c #  define MAX_ARCH_PFN		(1ULL<<(36-PAGE_SHIFT))
MAX_ARCH_PFN     1049 arch/x86/kernel/e820.c #  define MAX_ARCH_PFN		(1ULL<<(32-PAGE_SHIFT))
MAX_ARCH_PFN     1052 arch/x86/kernel/e820.c # define MAX_ARCH_PFN MAXMEM>>PAGE_SHIFT