From fa042186b932e9b9ee9a2fd8a04a3acf7c70d224 Mon Sep 17 00:00:00 2001
From: Tetsuyuki Kobayashi <koba@kmckk.co.jp>
Date: Thu, 28 Jun 2012 23:36:21 +0000
Subject: [PATCH] arm: bugfix: save_boot_params_default accesses uninitalized
 stack when -O0

save_boot_params_default() in cpu.c accesses uninitialized stack area
when it compiled with -O0 (not optimized).

Signed-off-by: Tetsuyuki Kobayashi <koba@kmckk.co.jp>
Acked-by: Tom Rini <trini@ti.com>
---
 arch/arm/cpu/armv7/cpu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm/cpu/armv7/cpu.c b/arch/arm/cpu/armv7/cpu.c
index c6fa8ef..9eb484a 100644
--- a/arch/arm/cpu/armv7/cpu.c
+++ b/arch/arm/cpu/armv7/cpu.c
@@ -36,9 +36,15 @@
 #include <asm/system.h>
 #include <asm/cache.h>
 #include <asm/armv7.h>
+#include <linux/compiler.h>
 
-void save_boot_params_default(u32 r0, u32 r1, u32 r2, u32 r3)
+void __naked save_boot_params_default(u32 r0, u32 r1, u32 r2, u32 r3)
 {
+	/*
+	 * Stack pointer is not yet initialized
+	 * Don't save anything to stack even if compiled with -O0
+	 */
+	asm("bx lr");
 }
 
 void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3)
-- 
2.7.4