linux-kernel - Re: [PATCH] ARM: imx: build v7_cpu

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Date:   Mon, 17 Feb 2020 08:41:37 +0100
From:   Rouven Czerwinski <r.czerwinski@...gutronix.de>
To:     s.hauer@...gutronix.de, shawnguo@...nel.org
Cc:     Ahmad Fatoum <a.fatoum@...gutronix.de>,
        linux-kernel@...r.kernel.org, linux-imx@....com,
        kernel@...gutronix.de, festevam@...il.com,
        linux-arm-kernel@...ts.infradead.org,
        Lucas Stach <l.stach@...gutronix.de>
Subject: Re: [PATCH] ARM: imx: build v7_cpu_resume() unconditionally

Hi Shawn,

On Thu, 2020-01-16 at 15:18 +0100, Rouven Czerwinski wrote:
> From: Ahmad Fatoum <a.fatoum@...gutronix.de>
> 
> This function is not only needed by the platform suspend code, but is
> also
> reused as the CPU resume function when the ARM cores can be powered
> down
> completely in deep idle, which is the case on i.MX6SX and i.MX6UL(L).
> 
> Providing the static inline stub whenever CONFIG_SUSPEND is disabled
> means
> that those platforms will hang on resume from cpuidle if suspend is
> disabled.
> 
> So there are two problems:
> 
>   - The static inline stub masks the linker error
>   - The function is not available where needed
> 
> Fix both by just building the function unconditionally, when
> CONFIG_SOC_IMX6 is enabled. The actual code is three instructions
> long,
> so it's arguably ok to just leave it in for all i.MX6 kernel
> configurations.
> 
> Fixes: 05136f0897b5 ("ARM: imx: support arm power off in cpuidle for
> i.mx6sx")
> Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
> Signed-off-by: Rouven Czerwinski <r.czerwinski@...gutronix.de>
> ---
>  arch/arm/mach-imx/Makefile       |  2 ++
>  arch/arm/mach-imx/common.h       |  4 ++--
>  arch/arm/mach-imx/resume-imx6.S  | 24 ++++++++++++++++++++++++
>  arch/arm/mach-imx/suspend-imx6.S | 14 --------------
>  4 files changed, 28 insertions(+), 16 deletions(-)
>  create mode 100644 arch/arm/mach-imx/resume-imx6.S

Gentle ping.

Can be found on patchwork: https://patchwork.kernel.org/patch/11337147/

Thanks,
Rouven Czerwinski