linux-kernel - Re: [PATCH] PM: Kconfig: fix unmet dependency for PM_SLEEP

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Date:   Mon, 22 Mar 2021 14:32:26 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Necip Fazil Yildiran <fazilyildiran@...il.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Zhang, Rui" <rui.zhang@...el.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        paul@...zz.com, jeho@...utexas.edu, julianbraha@...il.com
Subject: Re: [PATCH] PM: Kconfig: fix unmet dependency for PM_SLEEP_SMP

On Sun, Mar 21, 2021 at 9:20 PM Necip Fazil Yildiran
<fazilyildiran@...il.com> wrote:
>
> When PM_SLEEP_SMP is enabled and HOTPLUG_CPU is disabled, it results in the
> following Kbuild warning:
>
> WARNING: unmet direct dependencies detected for HOTPLUG_CPU
>   Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
>   Selected by [y]:
>   - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=n] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]
>
> The reason is that PM_SLEEP_SMP selects HOTPLUG_CPU without depending on or
> selecting HOTPLUG_CPU's dependencies.

This needs to be fixed.

HOTPLUG_CPU needs to be selected automatically by PM_SLEEP_SMP as it is now.

> Let PM_SLEEP_SMP depend on HOTPLUG_CPU instead to avoid Kbuild issues.
>
> Signed-off-by: Necip Fazil Yildiran <fazilyildiran@...il.com>
> ---
>  kernel/power/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
> index 6bfe3ead10ad..8b53c9b61347 100644
> --- a/kernel/power/Kconfig
> +++ b/kernel/power/Kconfig
> @@ -125,7 +125,7 @@ config PM_SLEEP_SMP
>         depends on SMP
>         depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
>         depends on PM_SLEEP
> -       select HOTPLUG_CPU
> +       depends on HOTPLUG_CPU
>
>  config PM_SLEEP_SMP_NONZERO_CPU
>         def_bool y
> --
> 2.25.1
>