[PATCH] ia64 PTRS_PER_PGD build fix

mm/memory.c:1944:6: missing binary operator before token "long"

The preprocessor doesn't like the typecast....

PTRS_PER_PGD isn't used in assembly code, so this looks to be safe enough..

This patch helps, but the ia64 build is still broken.  There is no
implementation of __pmd_alloc().

Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-ia64/pgtable.h

@@ -91,7 +91,7 @@
 #define PGDIR_SHIFT		(PAGE_SHIFT + 2*(PAGE_SHIFT-3))
 #define PGDIR_SIZE		(__IA64_UL(1) << PGDIR_SHIFT)
 #define PGDIR_MASK		(~(PGDIR_SIZE-1))
-#define PTRS_PER_PGD		(__IA64_UL(1) << (PAGE_SHIFT-3))
+#define PTRS_PER_PGD		(1UL << (PAGE_SHIFT-3))
 #define USER_PTRS_PER_PGD	(5*PTRS_PER_PGD/8)	/* regions 0-4 are user regions */
 #define FIRST_USER_PGD_NR	0