powerpc/boot: Fix build failure in 32-bit boot wrapper
OPAL is not callable from 32-bit mode and the assembly code for it
may not even build (depending on how binutils was configured).
References: https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpcspe&ver=4.8.7-1&stamp=1479203712
Fixes: 656ad58ef19e ("powerpc/boot: Add OPAL console to epapr wrappers")
Cc: stable@vger.kernel.org # v4.8+
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/boot/opal.c b/arch/powerpc/boot/opal.c
index d7b4fd4..0272570 100644
--- a/arch/powerpc/boot/opal.c
+++ b/arch/powerpc/boot/opal.c
@@ -13,7 +13,7 @@
#include <libfdt.h>
#include "../include/asm/opal-api.h"
-#ifdef __powerpc64__
+#ifdef CONFIG_PPC64_BOOT_WRAPPER
/* Global OPAL struct used by opal-call.S */
struct opal {