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    SubjectRE: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm.
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    Hi Paolo, Marc

    > -----Original Message-----
    > From: Paolo Bonzini <pbonzini@redhat.com>
    > Sent: Thursday, September 19, 2019 7:07 PM
    > To: Jianyong Wu (Arm Technology China) <Jianyong.Wu@arm.com>;
    > netdev@vger.kernel.org; yangbo.lu@nxp.com; john.stultz@linaro.org;
    > tglx@linutronix.de; sean.j.christopherson@intel.com; maz@kernel.org;
    > richardcochran@gmail.com; Mark Rutland <Mark.Rutland@arm.com>; Will
    > Deacon <Will.Deacon@arm.com>; Suzuki Poulose
    > <Suzuki.Poulose@arm.com>
    > Cc: linux-kernel@vger.kernel.org; kvm@vger.kernel.org; Steve Capper
    > <Steve.Capper@arm.com>; Kaly Xin (Arm Technology China)
    > <Kaly.Xin@arm.com>; Justin He (Arm Technology China)
    > <Justin.He@arm.com>; nd <nd@arm.com>; linux-arm-
    > kernel@lists.infradead.org
    > Subject: Re: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm.
    >
    > On 19/09/19 11:46, Jianyong Wu (Arm Technology China) wrote:
    > >> On 18/09/19 11:57, Jianyong Wu (Arm Technology China) wrote:
    > >>> Paolo Bonzini wrote:
    > >>>> This is not Y2038-safe. Please use ktime_get_real_ts64 instead,
    > >>>> and split the 64-bit seconds value between val[0] and val[1].
    > >
    > > Val[] should be long not u32 I think, so in arm64 I can avoid that
    > > Y2038_safe, but also need rewrite for arm32.
    >
    > I don't think there's anything inherently wrong with u32 val[], and as you
    > notice it lets you reuse code between arm and arm64. It's up to you and
    > Marc to decide.
    >
    To compatible 32-bit, Integrates second value and nanosecond value as a nanosecond value then split it into val[0] and val[1] and split cycle value into val[2] and val[3],
    In this way, time will overflow at Y2262.
    WDYT?

    Thanks
    Jianyong Wu

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