[U-Boot] [PATCH v2] arm: bugfix: save_boot_params_default accesses uninitalized stack when -O0

[Tetsuyuki Kobayashi <koba@kmckk.co.jp>]

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>
---
Changes for v2:
 - include <linux/compiler.h> and use __naked instead of __attribute__((naked))


 arch/arm/cpu/armv7/cpu.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/cpu/armv7/cpu.c b/arch/arm/cpu/armv7/cpu.c
index c6fa8ef..3e2a75c 100644
--- a/arch/arm/cpu/armv7/cpu.c
+++ b/arch/arm/cpu/armv7/cpu.c
@@ -36,9 +36,13 @@
 #include <asm/system.h>
 #include <asm/cache.h>
 #include <asm/armv7.h>
+#include <linux/compiler.h>
 
+__naked /* don't save anything to stack even if compiled with -O0 */
 void save_boot_params_default(u32 r0, u32 r1, u32 r2, u32 r3)
 {
+	/* stack is not yet initialized */
+	asm("bx lr");
 }
 
 void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3)
-- 
1.7.9.5