linux-kernel - Re: [PATCH 6/6] ARM: imx: select ARM_CPU

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Date:	Thu, 23 Aug 2012 10:41:23 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Russell King <rmk+kernel@....linux.org.uk>,
	linux-kernel@...r.kernel.org, Eric Miao <eric.miao@...aro.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH 6/6] ARM: imx: select ARM_CPU_SUSPEND when necessary

On Wed, Aug 22, 2012 at 05:13:10PM +0200, Arnd Bergmann wrote:
> On i.MX6, we select ARM_CPU_SUSPEND when building with power management
> support, but for some reason this was omitted on i.MX5. Normally we
> build kernels for both together so the error only showed up in
> randconfig tests.
> 
> Without this patch, building imx5 standalone results in:
> 
> arch/arm/mach-imx/built-in.o: In function `v7_cpu_resume':
> arch/arm/mach-imx/head-v7.S:104: undefined reference to `cpu_resume'
> 
So far, none of the functions in head-v7.S is used on imx5.  Also
since imx5 SoCs implement State Retention Power Gating in hardware,
ARM_CPU_SUSPEND support will never be used on imx5.

Maybe we should make head-v7.S only compile for imx6?

Regards,
Shawn

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Cc: Eric Miao <eric.miao@...aro.org>
> Cc: Shawn Guo <shawn.guo@...aro.org>
> Cc: stable@...r.kernel.org
> ---
>  arch/arm/mach-imx/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
> index afd542a..8e96573 100644
> --- a/arch/arm/mach-imx/Kconfig
> +++ b/arch/arm/mach-imx/Kconfig
> @@ -89,6 +89,7 @@ config SOC_IMX5
>  	select ARCH_MXC_IOMUX_V3
>  	select ARCH_HAS_CPUFREQ
>  	select ARCH_MX5
> +	select ARM_CPU_SUSPEND if PM
>  	bool
>  
>  config SOC_IMX50
> -- 
> 1.7.10
> 
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