linux-kernel - Re: [PATCH 1/2] ptp_clock: allow for it to be optional

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Date:   Mon, 19 Sep 2016 19:04:15 +0200
From:   Jiri Benc <jbenc@...hat.com>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Richard Cochran <richardcochran@...il.com>,
        Josh Triplett <josh@...htriplett.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ptp_clock: allow for it to be optional

On Mon, 19 Sep 2016 10:10:21 -0400 (EDT), Nicolas Pitre wrote:
> --- a/include/linux/ptp_clock_kernel.h
> +++ b/include/linux/ptp_clock_kernel.h
> @@ -207,7 +207,16 @@ int ptp_find_pin(struct ptp_clock *ptp,
>  #else
>  static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
>  						   struct device *parent)
> -{ return NULL; }
> +{
> +	if (IS_MODULE(CONFIG_PTP_1588_CLOCK)) {
> +		pr_warn("%s is built-in while PTP clock subsystem is modular, "
> +			"PTP clock ignored\n", KBUILD_MODNAME);
> +	} else {
> +		pr_warn("ignoring PTP clock from %s as PTP clock subsystem "
> +			"is configured out\n", KBUILD_MODNAME);
> +	}
> +	return NULL;
> +}

I think the else part is not needed. If PTP is disabled, it is
disabled, nobody should be surprised by that. Looks good otherwise.

Thanks,

 Jiri