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

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Message-ID: <20141021082058.GB6808@netboy>
Date:	Tue, 21 Oct 2014 10:20:58 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Jeff Epler <jepler@...ythonic.net>
Cc:	Thomas Shao <huishao@...rosoft.com>,
	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()

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.

Thanks,
Richard
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