[PATCH] i386 pgd_index() doesn't parenthesize its arg

Patch from William Lee Irwin III <wli@holomorphy.com>

PAE's pte_none() and pte_pfn() evaluate their arguments twice;
analogous fixes have been made to other things; c.f. pgtable.h's long
list of one-line inlines with parentheses still around their args.

include/asm-i386/pgtable-3level.h

@@ -89,8 +89,17 @@ static inline int pte_same(pte_t a, pte_t b)
 }
 
 #define pte_page(x)	pfn_to_page(pte_pfn(x))
-#define pte_none(x)	(!(x).pte_low && !(x).pte_high)
-#define pte_pfn(x)	(((x).pte_low >> PAGE_SHIFT) | ((x).pte_high << (32 - PAGE_SHIFT)))
+
+static inline int pte_none(pte_t pte)
+{
+	return !pte.pte_low && !pte.pte_high;
+}
+
+static inline unsigned long pte_pfn(pte_t pte)
+{
+	return (pte.pte_low >> PAGE_SHIFT) |
+		(pte.pte_high << (32 - PAGE_SHIFT));
+}
 
 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 {