ARM: 8380/1: bpf: fix NOMMU build

arch/arm/net/built-in.o: In function `bpf_jit_compile':
:(.text+0x2758): undefined reference to `set_memory_ro'
arch/arm/net/built-in.o: In function `bpf_jit_free':
:(.text+0x27ac): undefined reference to `set_memory_rw'

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/cacheflush.h

@@ -482,10 +482,17 @@ static inline void __sync_cache_range_r(volatile void *p, size_t size)
 	: : : "r0","r1","r2","r3","r4","r5","r6","r7", \
 	      "r9","r10","lr","memory" )
 
+#ifdef CONFIG_MMU
 int set_memory_ro(unsigned long addr, int numpages);
 int set_memory_rw(unsigned long addr, int numpages);
 int set_memory_x(unsigned long addr, int numpages);
 int set_memory_nx(unsigned long addr, int numpages);
+#else
+static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
+static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
+static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
+static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
+#endif
 
 #ifdef CONFIG_DEBUG_RODATA
 void mark_rodata_ro(void);