x86: unify pgd_present

Impact: cleanup

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

arch/x86/include/asm/pgtable.h

@@ -452,6 +452,13 @@ static inline int pud_present(pud_t pud)
 }
 #endif	/* PAGETABLE_LEVELS > 2 */
 
+#if PAGETABLE_LEVELS > 3
+static inline int pgd_present(pgd_t pgd)
+{
+	return pgd_val(pgd) & _PAGE_PRESENT;
+}
+#endif	/* PAGETABLE_LEVELS > 3 */
+
 #endif	/* __ASSEMBLY__ */
 
 #ifdef CONFIG_X86_32

arch/x86/include/asm/pgtable_64.h

@@ -182,7 +182,6 @@ static inline int pmd_bad(pmd_t pmd)
 #define pgd_page_vaddr(pgd)						\
 	((unsigned long)__va((unsigned long)pgd_val((pgd)) & PTE_PFN_MASK))
 #define pgd_page(pgd)		(pfn_to_page(pgd_val((pgd)) >> PAGE_SHIFT))
-#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
 static inline int pgd_large(pgd_t pgd) { return 0; }
 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)