xtensa: nommu: don't build most of the cache flushing code

Most cache flushing code is only relevant for MMU. Don't build it for
nommu configuration.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/include/asm/cacheflush.h

@@ -86,7 +86,8 @@ static inline void __invalidate_icache_page_alias(unsigned long virt,
  * (see also Documentation/cachetlb.txt)
  */
 
-#if (DCACHE_WAY_SIZE > PAGE_SIZE) || defined(CONFIG_SMP)
+#if defined(CONFIG_MMU) && \
+	((DCACHE_WAY_SIZE > PAGE_SIZE) || defined(CONFIG_SMP))
 
 #ifdef CONFIG_SMP
 void flush_cache_all(void);
@@ -152,7 +153,7 @@ void local_flush_cache_page(struct vm_area_struct *vma,
 #define flush_dcache_mmap_lock(mapping)			do { } while (0)
 #define flush_dcache_mmap_unlock(mapping)		do { } while (0)
 
-#if (DCACHE_WAY_SIZE > PAGE_SIZE)
+#if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE)
 
 extern void copy_to_user_page(struct vm_area_struct*, struct page*,
 		unsigned long, void*, const void*, unsigned long);

arch/xtensa/include/asm/page.h

@@ -145,7 +145,7 @@ extern void copy_page(void *to, void *from);
  * some extra work
  */
 
-#if DCACHE_WAY_SIZE > PAGE_SIZE
+#if defined(CONFIG_MMU) && DCACHE_WAY_SIZE > PAGE_SIZE
 extern void clear_page_alias(void *vaddr, unsigned long paddr);
 extern void copy_page_alias(void *to, void *from,
 			    unsigned long to_paddr, unsigned long from_paddr);

arch/xtensa/mm/Makefile

@@ -2,6 +2,6 @@
 # Makefile for the Linux/Xtensa-specific parts of the memory manager.
 #
 
-obj-y			:= init.o cache.o misc.o
-obj-$(CONFIG_MMU)	+= fault.o mmu.o tlb.o
+obj-y			:= init.o misc.o
+obj-$(CONFIG_MMU)	+= cache.o fault.o mmu.o tlb.o
 obj-$(CONFIG_HIGHMEM)	+= highmem.o