Pass arch/os in probe

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/arch/arch-generic.h b/arch/arch-generic.h
index c7b0ca0..a0b71f8 100644
--- a/arch/arch-generic.h
+++ b/arch/arch-generic.h
@@ -1,7 +1,7 @@
 #ifndef ARCH_GENERIC_H
 #define ARCH_GENERIC_H
 
-#define ARCH	(arch_generic)
+#define FIO_ARCH	(arch_generic)
 
 #define nop			do { } while (0)
 #define read_barrier()		__asm__ __volatile__("": : :"memory")