Fix compiler warning in arch/x86/mm/init_32.c

Signed-off-by: NIngo Brueckl <ib@wupperonline.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/x86/mm/init_32.c

@@ -435,8 +435,12 @@ static void __init set_highmem_pages_init(void)
 #endif /* !CONFIG_NUMA */
 
 #else
-# define permanent_kmaps_init(pgd_base)		do { } while (0)
-# define set_highmem_pages_init()	do { } while (0)
+static inline void permanent_kmaps_init(pgd_t *pgd_base)
+{
+}
+static inline void set_highmem_pages_init(void)
+{
+}
 #endif /* CONFIG_HIGHMEM */
 
 void __init native_pagetable_setup_start(pgd_t *base)