x86: fix warning on 32-bit non-PAE

Fix the warning:

include2/asm/pgtable.h: In function `pte_modify':
include2/asm/pgtable.h:290: warning: left shift count >= width of type

On 32-bit PAE the virtual and physical addresses are both 32-bits,
so it ends up evaluating 1<<32.  Do the shift as a 64-bit shift then
cast to the appropriate size.  This should all be done at compile time,
and so have no effect on generated code.
Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Tested-by: NHugh Dickins <hugh@veritas.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/asm-x86/page.h

@@ -29,7 +29,7 @@
 /* to align the pointer to the (next) page boundary */
 #define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)
 
-#define __PHYSICAL_MASK		((((phys_addr_t)1) << __PHYSICAL_MASK_SHIFT) - 1)
+#define __PHYSICAL_MASK		((phys_addr_t)(1ULL << __PHYSICAL_MASK_SHIFT) - 1)
 #define __VIRTUAL_MASK		((1UL << __VIRTUAL_MASK_SHIFT) - 1)
 
 #ifndef __ASSEMBLY__