linux-kernel - RE: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for do

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Date:	Tue, 21 Oct 2014 10:11:36 +0000
From:	Thomas Shao <huishao@...rosoft.com>
To:	Richard Cochran <richardcochran@...il.com>,
	Jeff Epler <jepler@...ythonic.net>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>,
	John Stultz <john.stultz@...aro.org>,
	Richard Cochran <rcochran@...utronix.de>
Subject: RE: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
 do_adjtimex()


> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
> owner@...r.kernel.org] On Behalf Of Richard Cochran
> Sent: Tuesday, October 21, 2014 4:21 PM
> To: Jeff Epler
> Cc: Thomas Shao; Thomas Gleixner; gregkh@...uxfoundation.org; LKML;
> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> jasowang@...hat.com; KY Srinivasan; John Stultz; Richard Cochran
> Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
> do_adjtimex()
> 
> On Mon, Oct 20, 2014 at 11:02:13PM -0500, Jeff Epler wrote:
> > It's interesting to imagine that a virtualization host could present a
> > time service to the guest *userspace*, even when the guest is not
> > otherwise exposed to the internet at large.  This could take the form
> > of an NTP server on a private network, or as an implementation of a
> > time source directly usable by ntpd in the guest, for instance as an
> > emulated serial port with synthetic NEMA GPS signal + PPS signal, for
> instance.
> 
> If the idea is to avoid bothering the guest user space, in order to be
> convenient, then the host can provide a synthetic PPS, to be used by the
> kernel's hardpps logic.
> 

This is something I should consider.  I'll do more investigation for this. Thanks Richard.

> Thanks,
> Richard
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