linux-kernel - Re: [PATCH v2 07/25] timekeeping: Move shadow_timekeeper into tk

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Message-ID: <CANDhNCrpOGnNXg0Q5QtWi3EzoyB=nO4BNqSk=oL5P-Qqy+301w@mail.gmail.com>
Date: Thu, 24 Oct 2024 14:11:11 -0700
From: John Stultz <jstultz@...gle.com>
To: Anna-Maria Behnsen <anna-maria@...utronix.de>
Cc: Frederic Weisbecker <frederic@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	Miroslav Lichvar <mlichvar@...hat.com>, Richard Cochran <richardcochran@...il.com>, 
	Christopher S Hall <christopher.s.hall@...el.com>
Subject: Re: [PATCH v2 07/25] timekeeping: Move shadow_timekeeper into tk_core

On Wed, Oct 9, 2024 at 1:29 AM Anna-Maria Behnsen
<anna-maria@...utronix.de> wrote:
>
> From: Thomas Gleixner <tglx@...utronix.de>
>
> From: Thomas Gleixner <tglx@...utronix.de>
>
> tk_core requires shadow_timekeeper to allow timekeeping_advance() updating
> without holding the timekeeper sequence count write locked. This allows the
> readers to make progress up to the actual update where the shadow
> timekeeper is copied over to the real timekeeper.
>
> As long as there is only a single timekeeper, having them separate is
> fine. But when the timekeeper infrastructure will be reused for per ptp
> clock timekeepers, shadow_timekeeper needs to be part of tk_core.
>
> No functional change.
>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de>

Acked-by: John Stultz <jstultz@...gle.com>