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

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Date:   Fri, 20 Jan 2017 11:07:15 -0200
From:   Marcelo Tosatti <mtosatti@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        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 Fri, Jan 20, 2017 at 01:55:27PM +0100, Paolo Bonzini wrote:
> 
> 
> On 20/01/2017 13:20, Marcelo Tosatti wrote:
> >  kernel/time/timekeeping.c        |   79 +++++++++++++++++++++++++++++++++++++++
> 
> Why not leave this in drivers/ptp/ptp_chardev.c?

timekeeper_lock

> > +		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

gettime64 is called directly via ptp_clock_gettime.