can't boot mpc5200, powerpc: Enable AT_BASE_PLATFORM aux vector

[Nathan Lynch]

Commit 9115d13453dee22473a1e8cacc90a8d64a9c4bc9 ("powerpc: Enable
AT_BASE_PLATFORM aux vector") broke boot on 32-bit powerpc systems; we
have to use PTRRELOC to initialize powerpc_base_platform this early in
boot.

Bug reported by Jon Smirl.

Signed-off-by: Nathan Lynch <ntl at pobox.com>
---
Benjamin Herrenschmidt wrote:
> if (RELOC(powerpc_base_platform))
> 	RELOC(powerpc_base_platform) = t->platform;
> 
> try that.

Maybe this?  (RELOC isn't defined in any header AFAICT).

 arch/powerpc/kernel/cputable.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index 25a052c..25c273c 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -1660,8 +1660,8 @@ struct cpu_spec * __init identify_cpu(unsigned long offset, unsigned int pvr)
 			 * Set the base platform string once; assumes
 			 * we're called with real pvr first.
 			 */
-			if (powerpc_base_platform == NULL)
-				powerpc_base_platform = t->platform;
+			if (*PTRRELOC(&powerpc_base_platform) == NULL)
+				*PTRRELOC(&powerpc_base_platform) = t->platform;
 
 #if defined(CONFIG_PPC64) || defined(CONFIG_BOOKE)
 			/* ppc64 and booke expect identify_cpu to also call
-- 
1.5.6.2