[PATCH] Make pud_alloc() and pmd_alloc() non-existant on !MMU

This makes the general pud_alloc() and pmd_alloc() inline functions
unavailable if CONFIG_MMU is not defined. 
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/mm.h

@@ -659,6 +659,7 @@ extern void remove_shrinker(struct shrinker *shrinker);
  * The following ifdef needed to get the 4level-fixup.h header to work.
  * Remove it when 4level-fixup.h has been removed.
  */
+#ifdef CONFIG_MMU
 #ifndef __ARCH_HAS_4LEVEL_HACK 
 static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
 {
@@ -674,6 +675,7 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
 	return pmd_offset(pud, address);
 }
 #endif
+#endif /* CONFIG_MMU */
 
 extern void free_area_init(unsigned long * zones_size);
 extern void free_area_init_node(int nid, pg_data_t *pgdat,