linux-kernel - Re: [PATCH] cpuidle: stub out cpuidle_poll_state_init() without CONFIG_CPU

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Date:   Tue, 20 Feb 2018 16:18:01 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpuidle: stub out cpuidle_poll_state_init() without CONFIG_CPU_IDLE

On Tuesday, February 20, 2018 4:05:44 PM CET Arnd Bergmann wrote:
> Calling cpuidle_poll_state_init() from apm_init() results in a link
> failure since that directory is never entered without CONFIG_CPU_IDLE:
> 
> arch/x86/kernel/apm_32.o: In function `apm_init':
> apm_32.c:(.init.text+0x62c): undefined reference to `cpuidle_poll_state_init'
> 
> CONFIG_ARCH_HAS_CPU_RELAX can be set without CONFIG_CPU_IDLE but has no
> effect then, so we should treat that configuration the same as
> if CONFIG_ARCH_HAS_CPU_RELAX was not set at all.
> 
> Fixes: 34c2f65b718d ("cpuidle: Move polling state initialization code to separate file")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  include/linux/cpuidle.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
> index 871f9e21810c..0b3fc229086c 100644
> --- a/include/linux/cpuidle.h
> +++ b/include/linux/cpuidle.h
> @@ -225,7 +225,7 @@ static inline void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev,
>  }
>  #endif
>  
> -#ifdef CONFIG_ARCH_HAS_CPU_RELAX
> +#if defined(CONFIG_CPU_IDLE) && defined(CONFIG_ARCH_HAS_CPU_RELAX)
>  void cpuidle_poll_state_init(struct cpuidle_driver *drv);
>  #else
>  static inline void cpuidle_poll_state_init(struct cpuidle_driver *drv) {}
> 

https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commit/?h=pm-4.16-rc2&id=d7212cfb05ba802bea4dd6c90d61cfe6366ea224

is in the Linus' tree already.

Thanks,
Rafael