[v3] powerpc/boot: Add OPAL console to epapr wrappers

[Michael Ellerman]

On Thu, 2016-30-06 at 14:34:37 UTC, Oliver O'Halloran wrote:
> This patch adds an OPAL console backend to the powerpc boot wrapper so
> that decompression failures inside the wrapper can be reported to the
> user. This is important since it typically indicates data corruption in
> the firmware and other nasty things.
...
> Cc: stable at vger.kernel.org

I've dropped stable, something this big needs to get some wider testing before
it goes to stable.

It was also giving me:

  arch/powerpc/boot/opal.c:30:12: warning: ‘opal_con_open’ defined but not used [-Wunused-function]

So I applied the following patch to fix it:

diff --git a/arch/powerpc/boot/opal.c b/arch/powerpc/boot/opal.c
index 3a2ce1e1f048..1f37e1c1d6d8 100644
--- a/arch/powerpc/boot/opal.c
+++ b/arch/powerpc/boot/opal.c
@@ -13,6 +13,8 @@
 #include <libfdt.h>
 #include "../include/asm/opal-api.h"
 
+#ifdef __powerpc64__
+
 /* Global OPAL struct used by opal-call.S */
 struct opal {
 	u64 base;
@@ -70,7 +72,6 @@ static void opal_init(void)
 	opal.entry = be64_to_cpu(opal.entry);
 }
 
-#ifdef __powerpc64__
 int opal_console_init(void *devp, struct serial_console_data *scdp)
 {
 	opal_init();
@@ -94,4 +95,4 @@ int opal_console_init(void *devp, struct serial_console_data *scdp)
 {
 	return -1;
 }
-#endif
+#endif /* __powerpc64__ */

cheers