linux-kernel - Re: [PATCH] power: supply: olpc_battery: remove unnecessary CONFIG_PM

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Date:   Thu, 29 Oct 2020 11:04:36 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Coiby Xu <coiby.xu@...il.com>, Ingo Molnar <mingo@...hat.com>,
        Darren Hart <dvhart@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Andy Shevchenko <andy@...radead.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "open list:X86 PLATFORM DRIVERS - ARCH" 
        <platform-driver-x86@...r.kernel.org>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] power: supply: olpc_battery: remove unnecessary
 CONFIG_PM_SLEEP

Hi,

On 10/29/20 8:41 AM, Coiby Xu wrote:
> SIMPLE_DEV_PM_OPS has already took good care of CONFIG_PM_CONFIG.

No it does not, when CONFIG_PM_SLEEP is not set then the
SET_SYSTEM_SLEEP_PM_OPS macro which SIMPLE_DEV_PM_OPS uses
is a no-op, so nothing will reference xo15_sci_resume leading to
a compiler warning when CONFIG_PM_SLEEP is not set.

You could drop the ifdef and add __maybe_unused to the definition
of xo15_sci_resume, but that feels like needless churn, best to
just keep this as is IMHO.

Also s/CONFIG_PM_CONFIG/CONFIG_PM_SLEEP/ in the commit message.

Regards,

Hans


> 
> Signed-off-by: Coiby Xu <coiby.xu@...il.com>
> ---
>  arch/x86/platform/olpc/olpc-xo15-sci.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/arch/x86/platform/olpc/olpc-xo15-sci.c b/arch/x86/platform/olpc/olpc-xo15-sci.c
> index 85f4638764d6..716eefd735a4 100644
> --- a/arch/x86/platform/olpc/olpc-xo15-sci.c
> +++ b/arch/x86/platform/olpc/olpc-xo15-sci.c
> @@ -192,7 +192,6 @@ static int xo15_sci_remove(struct acpi_device *device)
>  	return 0;
>  }
>  
> -#ifdef CONFIG_PM_SLEEP
>  static int xo15_sci_resume(struct device *dev)
>  {
>  	/* Enable all EC events */
> @@ -204,7 +203,6 @@ static int xo15_sci_resume(struct device *dev)
>  
>  	return 0;
>  }
> -#endif
>  
>  static SIMPLE_DEV_PM_OPS(xo15_sci_pm, NULL, xo15_sci_resume);
>  
>