linux-kernel - Re: [PATCH] cpuidle: tegra: add ARCH_SUSPEND

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Date:   Fri, 15 Oct 2021 09:49:20 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thierry Reding <treding@...dia.com>,
        Arnd Bergmann <arnd@...db.de>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        He Ying <heying24@...wei.com>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpuidle: tegra: add ARCH_SUSPEND_POSSIBLE dependency

14.10.2021 17:41, Arnd Bergmann пишет:
> On Thu, Oct 14, 2021 at 12:25 AM Dmitry Osipenko <digetx@...il.com> wrote:
>>
>> 13.10.2021 19:01, Arnd Bergmann пишет:
>>> From: Arnd Bergmann <arnd@...db.de>
>>>
>>> Some StrongARM processors don't support suspend, which leads
>>> to a build failure with the tegra cpuidle driver:
>>>
>>> WARNING: unmet direct dependencies detected for ARM_CPU_SUSPEND
>>>   Depends on [n]: ARCH_SUSPEND_POSSIBLE [=n]
>>>   Selected by [y]:
>>>   - ARM_TEGRA_CPUIDLE [=y] && CPU_IDLE [=y] && (ARM [=y] || ARM64) && (ARCH_TEGRA [=n] || COMPILE_TEST [=y]) && !ARM64 && MMU [=y]
>>>
>>> arch/arm/kernel/sleep.o: in function `__cpu_suspend':
>>> (.text+0x68): undefined reference to `cpu_sa110_suspend_size'
>>>
>>> Add an explicit dependency to make randconfig builds avoid
>>> this combination.
>>>
>>> Fixes: faae6c9f2e68 ("cpuidle: tegra: Enable compile testing")
>>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>>> ---
>>>  drivers/cpuidle/Kconfig.arm | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
>>> index 2cc3c208a180..af97992eaa82 100644
>>> --- a/drivers/cpuidle/Kconfig.arm
>>> +++ b/drivers/cpuidle/Kconfig.arm
>>> @@ -100,6 +100,7 @@ config ARM_MVEBU_V7_CPUIDLE
>>>  config ARM_TEGRA_CPUIDLE
>>>       bool "CPU Idle Driver for NVIDIA Tegra SoCs"
>>>       depends on (ARCH_TEGRA || COMPILE_TEST) && !ARM64 && MMU
>>> +     depends on ARCH_SUSPEND_POSSIBLE
>>>       select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP
>>>       select ARM_CPU_SUSPEND
>>>       help
>>>
>>
>> Reviewed-by: Dmitry Osipenko <digetx@...il.com>
> 
> Thanks!
> 
> I realized now that we should drop the '&& MMU' after my fix, for both
> the tegra and qualcomm drivers, reverting the change from 498ba2a8a275
> ("cpuidle: Fix ARM_QCOM_SPM_CPUIDLE configuration") that got failed
> to fix this problem. I'll resend it as a series of three patches with your R-b
> on this patch.
> 
> On a related note, I now see that the "||COMPILE_TEST" bit for the
> arm-specific cpuidle drivers is not all that useful because we can curently
> not hit that on non-ARM machines at all. I'll try changing that as well, but
> this is probably nontrivial.

Ack