linux-kernel - Re: [patch 2/3] ptp: Use ktime_get_clock

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Message-ID: <37183532-54ff-47c8-9955-af97005e0d46@linux.dev>
Date: Sun, 29 Jun 2025 16:50:27 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>
Cc: netdev@...r.kernel.org, Richard Cochran <richardcochran@...il.com>,
 Christopher Hall <christopher.s.hall@...el.com>,
 John Stultz <jstultz@...gle.com>, Frederic Weisbecker <frederic@...nel.org>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Miroslav Lichvar <mlichvar@...hat.com>,
 Werner Abt <werner.abt@...nberg-usa.com>,
 David Woodhouse <dwmw2@...radead.org>, Stephen Boyd <sboyd@...nel.org>,
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
 Kurt Kanzenbach <kurt@...utronix.de>, Nam Cao <namcao@...utronix.de>,
 Antoine Tenart <atenart@...nel.org>
Subject: Re: [patch 2/3] ptp: Use ktime_get_clock_ts64() for timestamping

On 26/06/2025 14:27, Thomas Gleixner wrote:
> The inlined ptp_read_system_[pre|post]ts() switch cases expand to a copious
> amount of text in drivers, e.g. ~500 bytes in e1000e. Adding auxiliary
> clock support to the inlines would increase it further.
> 
> Replace the inline switch case with a call to ktime_get_clock_ts64(), which
> reduces the code size in drivers and allows to access auxiliary clocks once
> they are enabled in the IOCTL parameter filter.
> 
> No functional change.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>   include/linux/ptp_clock_kernel.h |   34 ++++------------------------------
>   1 file changed, 4 insertions(+), 30 deletions(-)
> 
> --- a/include/linux/ptp_clock_kernel.h
> +++ b/include/linux/ptp_clock_kernel.h
> @@ -477,40 +477,14 @@ static inline ktime_t ptp_convert_timest
>   
>   static inline void ptp_read_system_prets(struct ptp_system_timestamp *sts)
>   {
> -	if (sts) {
> -		switch (sts->clockid) {
> -		case CLOCK_REALTIME:
> -			ktime_get_real_ts64(&sts->pre_ts);
> -			break;
> -		case CLOCK_MONOTONIC:
> -			ktime_get_ts64(&sts->pre_ts);
> -			break;
> -		case CLOCK_MONOTONIC_RAW:
> -			ktime_get_raw_ts64(&sts->pre_ts);
> -			break;
> -		default:
> -			break;
> -		}
> -	}
> +	if (sts)
> +		ktime_get_clock_ts64(sts->clockid, &sts->pre_ts);
>   }
>   
>   static inline void ptp_read_system_postts(struct ptp_system_timestamp *sts)
>   {
> -	if (sts) {
> -		switch (sts->clockid) {
> -		case CLOCK_REALTIME:
> -			ktime_get_real_ts64(&sts->post_ts);
> -			break;
> -		case CLOCK_MONOTONIC:
> -			ktime_get_ts64(&sts->post_ts);
> -			break;
> -		case CLOCK_MONOTONIC_RAW:
> -			ktime_get_raw_ts64(&sts->post_ts);
> -			break;
> -		default:
> -			break;
> -		}
> -	}
> +	if (sts)
> +		ktime_get_clock_ts64(sts->clockid, &sts->post_ts);
>   }
>   
>   #endif
> 
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>