linux-kernel - Re: [PATCH] pcmcia: Guard yenta_dev_{resume,suspend}_noirq() on CONFIG_PM

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Date:   Wed, 12 Jan 2022 05:56:20 +0100
From:   Dominik Brodowski <linux@...inikbrodowski.net>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Cai Huoqing <caihuoqing@...du.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pcmcia: Guard yenta_dev_{resume,suspend}_noirq() on
 CONFIG_PM_SLEEP

Am Tue, Jan 11, 2022 at 09:50:04AM -0700 schrieb Nathan Chancellor:
> When building without CONFIG_PM_SLEEP:
> 
> drivers/pcmcia/yenta_socket.c:1322:12: error: ‘yenta_dev_resume_noirq’ defined but not used [-Werror=unused-function]
>  1322 | static int yenta_dev_resume_noirq(struct device *dev)
>       |            ^~~~~~~~~~~~~~~~~~~~~~
> drivers/pcmcia/yenta_socket.c:1303:12: error: ‘yenta_dev_suspend_noirq’ defined but not used [-Werror=unused-function]
>  1303 | static int yenta_dev_suspend_noirq(struct device *dev)
>       |            ^~~~~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> 
> SET_NOIRQ_SYSTEM_SLEEP_PM_OPS evaluates to an empty macro when
> CONFIG_PM_SLEEP is not set. Every callback in yenta_pm_ops depends on
> CONFIG_PM_SLEEP to work properly so just guard this whole block on
> CONFIG_PM_SLEEP, rather than CONFIG_PM, which CONFIG_PM_SLEEP will
> select.
> 
> Fixes: 3daaf2c7aae8 ("pcmcia: Make use of the helper macro SET_NOIRQ_SYSTEM_SLEEP_PM_OPS()")
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

Thanks! An equivalent patch by Paul E. McKenney was hand-picked by Linus in
the meantime:
	https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=579f3a6d32a9c3d1cf5c2b1bd66817a2db31a968

Thanks again,
	Dominik

> ---
>  drivers/pcmcia/yenta_socket.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
> index 837877daed62..3966a6ceb1ac 100644
> --- a/drivers/pcmcia/yenta_socket.c
> +++ b/drivers/pcmcia/yenta_socket.c
> @@ -1299,7 +1299,7 @@ static int yenta_probe(struct pci_dev *dev, const struct pci_device_id *id)
>  	return ret;
>  }
>  
> -#ifdef CONFIG_PM
> +#ifdef CONFIG_PM_SLEEP
>  static int yenta_dev_suspend_noirq(struct device *dev)
>  {
>  	struct pci_dev *pdev = to_pci_dev(dev);
> 
> base-commit: fbb3485f1f931102d8ba606f1c28123f5b48afa3
> -- 
> 2.34.1
>