systems with MMUs, so we don't need them. */
#define flush_cache_all() ((void)0)
#define flush_cache_mm(mm) ((void)0)
systems with MMUs, so we don't need them. */
#define flush_cache_all() ((void)0)
#define flush_cache_mm(mm) ((void)0)
#define flush_cache_vmap(start, end) ((void)0)
#define flush_cache_vunmap(start, end) ((void)0)
#define flush_cache_vmap(start, end) ((void)0)
#define flush_cache_vunmap(start, end) ((void)0)