Blackfin arch: Update some inline assembly, tweak some register constraints

Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/include/asm/system.h b/arch/blackfin/include/asm/system.h
index dea9203..aa7d87b 100644
--- a/arch/blackfin/include/asm/system.h
+++ b/arch/blackfin/include/asm/system.h
@@ -44,10 +44,10 @@
 /*
  * Force strict CPU ordering.
  */
-#define nop()  asm volatile ("nop;\n\t"::)
-#define mb()   asm volatile (""   : : :"memory")
-#define rmb()  asm volatile (""   : : :"memory")
-#define wmb()  asm volatile (""   : : :"memory")
+#define nop()  __asm__ __volatile__ ("nop;\n\t" : : )
+#define mb()   __asm__ __volatile__ (""   : : : "memory")
+#define rmb()  __asm__ __volatile__ (""   : : : "memory")
+#define wmb()  __asm__ __volatile__ (""   : : : "memory")
 #define set_mb(var, value) do { (void) xchg(&var, value); } while (0)
 #define read_barrier_depends() 		do { } while(0)