+--- a/arch/mips/include/asm/cacheflush.h
++++ b/arch/mips/include/asm/cacheflush.h
+@@ -32,7 +32,7 @@
+ extern void (*flush_cache_all)(void);
+ extern void (*__flush_cache_all)(void);
+ extern void (*flush_cache_mm)(struct mm_struct *mm);
+-#define flush_cache_dup_mm(mm) do { (void) (mm); } while (0)
++#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
+ extern void (*flush_cache_range)(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end);
+ extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);