Pass arch/os in probe

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/arch/arch-ppc.h b/arch/arch-ppc.h
index d495a1b..b790a55 100644
--- a/arch/arch-ppc.h
+++ b/arch/arch-ppc.h
@@ -1,7 +1,7 @@
 #ifndef ARCH_PPC_H
 #define ARCH_PPH_H
 
-#define ARCH	(arch_ppc)
+#define FIO_ARCH	(arch_ppc)
 
 #ifndef __NR_ioprio_set
 #define __NR_ioprio_set		273