linux-kernel - Re: [PATCH 3/6] Timer: expose monotonic clock and counter value

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Message-ID: <20190918034235.GA1469@localhost>
Date:   Tue, 17 Sep 2019 20:42:35 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Jianyong Wu <jianyong.wu@....com>
Cc:     netdev@...r.kernel.org, pbonzini@...hat.com,
        sean.j.christopherson@...el.com, maz@...nel.org,
        Mark.Rutland@....com, Will.Deacon@....com, suzuki.poulose@....com,
        linux-kernel@...r.kernel.org, Steve.Capper@....com,
        Kaly.Xin@....com, justin.he@....com, nd@....com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/6] Timer: expose monotonic clock and counter value

On Tue, Sep 17, 2019 at 07:24:27AM -0400, Jianyong Wu wrote:
> A number of PTP drivers (such as ptp-kvm) are assuming what the
> current clock source is, which could lead to interesting effects on
> systems where the clocksource can change depending on external events.
> 
> For this purpose, add a new API that retrives both the current
> monotonic clock as well as its counter value.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Signed-off-by: Jianyong Wu <jianyong.wu@....com>
> ---
>  include/linux/timekeeping.h |  3 +++
>  kernel/time/timekeeping.c   | 13 +++++++++++++
>  2 files changed, 16 insertions(+)

For core time keeping changes, you must CC lkml, tglx, and John Stultz.

Thanks,
Richard