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

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Message-ID: <20170124053243.GA1906@localhost.localdomain>
Date:   Tue, 24 Jan 2017 06:32:43 +0100
From:   Richard Cochran <richardcochran@...il.com>
To:     Marcelo Tosatti <mtosatti@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Miroslav Lichvar <mlichvar@...hat.com>
Subject: Re: [patch 4/5] PTP: add PTP_SYS_OFFSET emulation via cross
 timestamps infrastructure

On Mon, Jan 23, 2017 at 09:06:20PM -0200, Marcelo Tosatti wrote:
> Can you please describe what problem exists with this scheme?

This new kernel code exists just because chrony doesn't implement the
PRECISE ioctl.  Instead of adding new "fake" modes, just teach chrony
about the better method.

I prefer to have kernel interfaces whose behavior is clear and
consistent.

Thanks,
Richard