linux-kernel - Re: [PATCH] x86/xen/time: set ->min_delta_ticks and ->max_delta

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Message-ID: <129c96ff-2162-0d2e-1674-e07fa89eff42@suse.com>
Date:   Tue, 11 Apr 2017 07:09:17 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Nicolai Stange <nicstange@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     John Stultz <john.stultz@...aro.org>, linux-kernel@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH] x86/xen/time: set ->min_delta_ticks and ->max_delta_ticks

On 30/03/17 22:06, 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 x86 arch's xen 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>

Applied to xen/tip for-linus-4.12


Thanks,

Juergen