From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tom Rini <trini@ti.com>
Date: Thu, 28 Jun 2012 07:57:49 -0700
Subject: [U-Boot] [PATCH v2] arm: bugfix: save_boot_params_default
 accesses uninitalized stack when -O0
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	<20120627174015.GC28055@bill-the-cat>
	<4FEBAFE2.4000906@kmckk.co.jp> <4FEC4195.1020400@kmckk.co.jp>
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On 06/28/2012 04:35 AM, Tetsuyuki Kobayashi wrote:
> 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)

The usual form (here and kernel) is:
void __naked save_boot_params_default(...)

Same for __weak and so on.  Thanks!

-- 
Tom