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Mon, 23 Sep 2019 04:57:58 +0000 Received: from HE1PR0801MB1676.eurprd08.prod.outlook.com ([fe80::4d35:2b8f:1786:84cd]) by HE1PR0801MB1676.eurprd08.prod.outlook.com ([fe80::4d35:2b8f:1786:84cd%3]) with mapi id 15.20.2284.023; Mon, 23 Sep 2019 04:57:57 +0000 From: "Jianyong Wu (Arm Technology China)" To: Paolo Bonzini , "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 , Will Deacon , Suzuki Poulose Subject: RE: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm. Thread-Topic: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm. 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Justin He \(Arm Technology China\)" , "kvm@vger.kernel.org" , Steve Capper , "linux-kernel@vger.kernel.org" , "Kaly Xin \(Arm Technology China\)" , nd , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Paolo, Marc > -----Original Message----- > From: Paolo Bonzini > Sent: Thursday, September 19, 2019 7:07 PM > To: Jianyong Wu (Arm Technology China) ; > 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 ; Will > Deacon ; Suzuki Poulose > > Cc: linux-kernel@vger.kernel.org; kvm@vger.kernel.org; Steve Capper > ; Kaly Xin (Arm Technology China) > ; Justin He (Arm Technology China) > ; nd ; 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel