Pass arch/os in probe

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/arch/arch-s390.h b/arch/arch-s390.h
index 0647750..fe51791 100644
--- a/arch/arch-s390.h
+++ b/arch/arch-s390.h
@@ -1,7 +1,7 @@
 #ifndef ARCH_S390_H
 #define ARCH_S390_H
 
-#define ARCH	(arch_s390)
+#define FIO_ARCH	(arch_s390)
 
 #ifndef __NR_ioprio_set
 #define __NR_ioprio_set		282