[PATCH] ARM: v7-M: Use ret_to_user_from_irq in PendSV handler

[Uwe Kleine-König]

On Sun, Oct 25, 2015 at 09:10:52PM -0300, Ezequiel Garcia wrote:
> The PendSV handler calls v7m_exception_entry which
> disables IRQs. Therefore, since IRQs are already disabled,
> the PendSV handler can return using ret_to_user_from_irq.
> 
> Signed-off-by: Ezequiel Garcia <ezequiel at vanguardiasur.com.ar>
Looks right. How did you notice this?

Acked-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>

Best regards
Uwe

> ---
> Tested on a NXP LPC43xx platform.
> 
>  arch/arm/kernel/entry-v7m.S | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/kernel/entry-v7m.S b/arch/arm/kernel/entry-v7m.S
> index b6c8bb9315e7..907534f97053 100644
> --- a/arch/arm/kernel/entry-v7m.S
> +++ b/arch/arm/kernel/entry-v7m.S
> @@ -88,7 +88,7 @@ __pendsv_entry:
>  	@ execute the pending work, including reschedule
>  	get_thread_info tsk
>  	mov	why, #0
> -	b	ret_to_user
> +	b	ret_to_user_from_irq
>  ENDPROC(__pendsv_entry)
>  
>  /*
> -- 
> 2.5.2
> 
> 

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