x86: increase max physical memory size of 64-bit

Increase the maximum physical address size of x86_64 system
to 44-bits. This is in preparation for future chips that
support larger physical memory sizes.
Signed-off-by: NJack Steiner <steiner@sgi.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

include/asm-x86/sparsemem.h

@@ -26,8 +26,8 @@
 # endif
 #else /* CONFIG_X86_32 */
 # define SECTION_SIZE_BITS	27 /* matt - 128 is convenient right now */
-# define MAX_PHYSADDR_BITS	40
-# define MAX_PHYSMEM_BITS	40
+# define MAX_PHYSADDR_BITS	44
+# define MAX_PHYSMEM_BITS	44
 #endif
 
 #endif /* CONFIG_SPARSEMEM */