diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h
index 907fa5d16494..4a674db4e1fa 100644
--- a/include/asm-generic/cacheflush.h
+++ b/include/asm-generic/cacheflush.h
@@ -2,6 +2,11 @@
 #ifndef _ASM_GENERIC_CACHEFLUSH_H
 #define _ASM_GENERIC_CACHEFLUSH_H
 
+struct mm_struct;
+struct vm_area_struct;
+struct page;
+struct address_space;
+
 /*
  * The cache doesn't need to be flushed when TLB entries change when
  * the cache is mapped to physical memory, not virtual memory