netdev - RE: [PATCH 3/6] Timer: expose monotonic clock and counter value

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Message-ID: <HE1PR0801MB1676AD8E5E50B70F1E3CD9F5F48E0@HE1PR0801MB1676.eurprd08.prod.outlook.com>
Date:   Wed, 18 Sep 2019 06:01:34 +0000
From:   "Jianyong Wu (Arm Technology China)" <Jianyong.Wu@....com>
To:     Richard Cochran <richardcochran@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
        "maz@...nel.org" <maz@...nel.org>,
        Mark Rutland <Mark.Rutland@....com>,
        Will Deacon <Will.Deacon@....com>,
        Suzuki Poulose <Suzuki.Poulose@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Steve Capper <Steve.Capper@....com>,
        "Kaly Xin (Arm Technology China)" <Kaly.Xin@....com>,
        "Justin He (Arm Technology China)" <Justin.He@....com>,
        nd <nd@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 3/6] Timer: expose monotonic clock and counter value

Hi Richard,

> -----Original Message-----
> From: Richard Cochran <richardcochran@...il.com>
> Sent: Wednesday, September 18, 2019 11:43 AM
> To: Jianyong Wu (Arm Technology China) <Jianyong.Wu@....com>
> Cc: netdev@...r.kernel.org; pbonzini@...hat.com;
> sean.j.christopherson@...el.com; maz@...nel.org; Mark Rutland
> <Mark.Rutland@....com>; Will Deacon <Will.Deacon@....com>; Suzuki
> Poulose <Suzuki.Poulose@....com>; linux-kernel@...r.kernel.org; Steve
> Capper <Steve.Capper@....com>; Kaly Xin (Arm Technology China)
> <Kaly.Xin@....com>; Justin He (Arm Technology China)
> <Justin.He@....com>; nd <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, I will.

Thanks
Jianyong Wu

> Thanks,
> Richard