The definition of fast_mb() is the same in both the Octeon & non-Octeon
cases, so remove the duplication & define it only once.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-kernel@vger.kernel.org
 }
 #define wmb wmb
 
+#define fast_mb()      __sync()
+
 #define __fast_iob()                           \
        __asm__ __volatile__(                   \
                ".set   push\n\t"               \
                : "m" (*(int *)CKSEG1)          \
                : "memory")
 #ifdef CONFIG_CPU_CAVIUM_OCTEON
-# define fast_mb()     __sync()
 # define fast_iob()    do { } while (0)
 #else /* ! CONFIG_CPU_CAVIUM_OCTEON */
-# define fast_mb()     __sync()
 # ifdef CONFIG_SGI_IP28
 #  define fast_iob()                           \
        __asm__ __volatile__(                   \