linux-kernel - Re: [PATCH v1 1/1] arm64: Early boot time stamps

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Message-ID: <20181120150327.kc5bbkfecmfwbgzn@soleen.tm1wkky2jk1uhgkn0ivaxijq1c.bx.internal.cloudapp.net>
Date:   Tue, 20 Nov 2018 15:03:27 +0000
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     catalin.marinas@....com, will.deacon@....com,
        Andrew Morton <akpm@...ux-foundation.org>,
        rppt@...ux.vnet.ibm.com, Michal Hocko <mhocko@...e.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        andrew.murray@....com, james.morse@....com, sboyd@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/1] arm64: Early boot time stamps

On 18-11-20 14:55:23, Marc Zyngier wrote:
> > Yeah, I saw 56 is used in arm_arch_timer.c, but I could not find where
> > this minimum is defined in aarch64 specs. I will change it to 56.
> 
> See D10.1.2 (The system counter) in the ARM ARM[1], which says:
> 
> <quote>
> The Generic Timer provides a system counter with the following
> specification:
> Width	At least 56 bits wide.
> 	The value returned by any 64-bit read of the counter is
> 	zero-extended to 64 bits.
> </quote>
> 
> This is not AArch64-specific though, and 32bit systems implementing the
> generic timers have the exact same requirements.

Thank you, makes sense. I was thinking there could be AArch64 specific
minimum limit.

> 
> > I will send v2 soon.
> 
> Please wait a bit and give others a chance to review this too.

I already sent, but will wait in the future before sending v3.

> 
> Thanks,
> 
> 	M.
> 
> [1] https://static.docs.arm.com/ddi0487/da/DDI0487D_a_armv8_arm.pdf
> -- 
> Jazz is not dead. It just smells funny...