Messages in this thread | | | From | "Jianyong Wu (Arm Technology China)" <> | Subject | RE: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm. | Date | Mon, 23 Sep 2019 04:57:57 +0000 |
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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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