linux-kernel - Re: [PATCH 1/7] cpuidle-haltpoll: Make boot_option_idle

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Date:   Thu, 10 Aug 2023 21:22:30 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Mihai Carabas <mihai.carabas@...cle.com>
Cc:     Joao Martins <joao.m.martins@...cle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Juerg Haefliger <juerg.haefliger@...onical.com>,
        Mickaël Salaün <mic@...ikod.net>,
        Arnd Bergmann <arnd@...db.de>,
        Ankur Arora <ankur.a.arora@...cle.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvm@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 1/7] cpuidle-haltpoll: Make boot_option_idle_override
 check X86 specific

On Wed, Aug 9, 2023 at 2:52 PM Mihai Carabas <mihai.carabas@...cle.com> wrote:
>
> From: Joao Martins <joao.m.martins@...cle.com>
>
> In the pursuit of letting it build on ARM let's not include what is x86
> specific.
>
> Signed-off-by: Joao Martins <joao.m.martins@...cle.com>
> Signed-off-by: Mihai Carabas <mihai.carabas@...cle.com>
> ---
>  drivers/cpuidle/cpuidle-haltpoll.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/cpuidle/cpuidle-haltpoll.c b/drivers/cpuidle/cpuidle-haltpoll.c
> index e66df22f9695..0ca3c8422eb6 100644
> --- a/drivers/cpuidle/cpuidle-haltpoll.c
> +++ b/drivers/cpuidle/cpuidle-haltpoll.c
> @@ -104,9 +104,11 @@ static int __init haltpoll_init(void)
>         int ret;
>         struct cpuidle_driver *drv = &haltpoll_driver;
>
> +#ifdef CONFIG_X86
>         /* Do not load haltpoll if idle= is passed */
>         if (boot_option_idle_override != IDLE_NO_OVERRIDE)
>                 return -ENODEV;
> +#endif

I'm sure that adding this #ifdef to the function body is avoidable.

>         if (!kvm_para_available() || !haltpoll_want())
>                 return -ENODEV;
> --