linux-kernel - Re: [patch 4/5] PTP: add PTP_SYS_OFFSET emulation via cross timestamps infrastructure

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Message-ID: <48bb2650-ed00-ec07-31bf-8780d3ab5568@redhat.com>
Date:   Fri, 20 Jan 2017 13:55:27 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Radim Krcmar <rkrcmar@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        Miroslav Lichvar <mlichvar@...hat.com>
Subject: Re: [patch 4/5] PTP: add PTP_SYS_OFFSET emulation via cross
 timestamps infrastructure



On 20/01/2017 13:20, Marcelo Tosatti wrote:
>  kernel/time/timekeeping.c        |   79 +++++++++++++++++++++++++++++++++++++++

Why not leave this in drivers/ptp/ptp_chardev.c?

> +		if (ptp->info->emulate_ptp_sys_offset_mean) {
> +			err = emulate_ptp_sys_offset(ptp->info, sysoff, arg);
> +			break;
> +		}

I think this should be simply "if (!ptp->info->gettime64)" and,
likewise, there should be an emulation based getcrosststamp in
ptp_clock_gettime.

Paolo