x86: unify pgd_page

Impact: cleanup

Unify and demacro pgd_page.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

arch/x86/include/asm/pgtable.h

@@ -495,6 +495,11 @@ static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 {
 	return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
 }
+
+static inline struct page *pgd_page(pgd_t pgd)
+{
+	return pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT);
+}
 #endif	/* PAGETABLE_LEVELS > 3 */
 
 #endif	/* __ASSEMBLY__ */

arch/x86/include/asm/pgtable_64.h

@@ -179,7 +179,6 @@ static inline int pmd_bad(pmd_t pmd)
 /*
  * Level 4 access.
  */
-#define pgd_page(pgd)		(pfn_to_page(pgd_val((pgd)) >> PAGE_SHIFT))
 static inline int pgd_large(pgd_t pgd) { return 0; }
 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)