linux-kernel - Re: [PATCH] hexagon/time: set ->min_delta_ticks and ->max_delta

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Message-ID: <20170403154916.GA19890@codeaurora.org>
Date:   Mon, 3 Apr 2017 10:49:16 -0500
From:   Richard Kuo <rkuo@...eaurora.org>
To:     Nicolai Stange <nicstange@...il.com>
Cc:     John Stultz <john.stultz@...aro.org>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-hexagon@...r.kernel.org
Subject: Re: [PATCH] hexagon/time: set ->min_delta_ticks and ->max_delta_ticks

On Thu, Mar 30, 2017 at 09:43:32PM +0200, Nicolai Stange wrote:
> In preparation for making the clockevents core NTP correction aware,
> all clockevent device drivers must set ->min_delta_ticks and
> ->max_delta_ticks rather than ->min_delta_ns and ->max_delta_ns: a
> clockevent device's rate is going to change dynamically and thus, the
> ratio of ns to ticks ceases to stay invariant.
> 
> Make the hexagon arch's clockevent driver initialize these fields
> properly.
> 
> This patch alone doesn't introduce any change in functionality as the
> clockevents core still looks exclusively at the (untouched) ->min_delta_ns
> and ->max_delta_ns. As soon as this has changed, a followup patch will
> purge the initialization of ->min_delta_ns and ->max_delta_ns from this
> driver.
> 
> Signed-off-by: Nicolai Stange <nicstange@...il.com>
> ---
> 
> Notes:
>     This prerequisite patch is part of a larger effort to feed NTP
>     corrections into the clockevent devices' frequencies and thus
>     avoiding their notion of time to diverge from the system's
>     one. If you're interested, the current state of the whole series
>     can be found at [1].
>     
>     If you haven't got any objections and these prerequisites get
>     merged by 4.12 everywhere, I'll proceed with the remainder of
>     this series in 4.13.
>     
>     Applicable to next-20170324 as well as to John' Stultz tree [2].
>     
>     [1]
>       git://nicst.de/linux.git cev-freq-adj.v10.fortglx-4.12-time
>       https://nicst.de/git/?p=linux.git;a=shortlog;h=refs/heads/cev-freq-adj.v10.fortglx-4.12-time
>     
>     [2]
>       https://git.linaro.org/people/john.stultz/linux.git fortglx/4.12/time
> 
>  arch/hexagon/kernel/time.c | 2 ++
>  1 file changed, 2 insertions(+)

Acked-by: Richard Kuo <rkuo@...eaurora.org>


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