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

[Jianyong Wu (Arm Technology China)]

Hi Richard,

> -----Original Message-----
> From: Richard Cochran <richardcochran@xxxxxxxxx>
> Sent: Wednesday, September 18, 2019 11:43 AM
> To: Jianyong Wu (Arm Technology China) <Jianyong.Wu@xxxxxxx>
> Cc: netdev@xxxxxxxxxxxxxxx; pbonzini@xxxxxxxxxx;
> sean.j.christopherson@xxxxxxxxx; maz@xxxxxxxxxx; Mark Rutland
> <Mark.Rutland@xxxxxxx>; Will Deacon <Will.Deacon@xxxxxxx>; Suzuki
> Poulose <Suzuki.Poulose@xxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx; Steve
> Capper <Steve.Capper@xxxxxxx>; Kaly Xin (Arm Technology China)
> <Kaly.Xin@xxxxxxx>; Justin He (Arm Technology China)
> <Justin.He@xxxxxxx>; nd <nd@xxxxxxx>; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx
> 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@xxxxxxxxxx>
> > Signed-off-by: Jianyong Wu <jianyong.wu@xxxxxxx>
> > ---
> >  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