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

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Date:   Thu, 14 Oct 2021 16:41:48 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
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

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.

        Arnd