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).
This patch removes save_boot_params_default() and put the equivalent in start.S

Signed-off-by: Tetsuyuki Kobayashi <koba@kmckk.co.jp>
Acked-by: Tom Rini <trini@ti.com>

arch/arm/cpu/armv7/cpu.c

@@ -38,13 +38,6 @@
 #include <asm/armv7.h>
 #include <linux/compiler.h>
 
-void save_boot_params_default(u32 r0, u32 r1, u32 r2, u32 r3)
-{
-}
-
-void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3)
-	__attribute__((weak, alias("save_boot_params_default")));
-
 void __weak cpu_cache_initialization(void){}
 
 int cleanup_before_linux(void)

arch/arm/cpu/armv7/start.S

@@ -305,6 +305,20 @@ ENDPROC(relocate_code)
 
 /*************************************************************************
  *
+ * void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3)
+ *	__attribute__((weak));
+ *
+ * Stack pointer is not yet initialized at this moment
+ * Don't save anything to stack even if compiled with -O0
+ *
+ *************************************************************************/
+ENTRY(save_boot_params)
+	bx	lr			@ back to my caller
+ENDPROC(save_boot_params)
+	.weak	save_boot_params
+
+/*************************************************************************
+ *
  * cpu_init_cp15
  *
  * Setup CP15 registers (cache, MMU, TLBs). The I-cache is turned on unless