RE: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for do_adjtimex()

[Thomas Shao]

> -----Original Message-----
> From: linux-kernel-owner@xxxxxxxxxxxxxxx [mailto:linux-kernel-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Richard Cochran
> Sent: Tuesday, October 21, 2014 4:21 PM
> To: Jeff Epler
> Cc: Thomas Shao; Thomas Gleixner; gregkh@xxxxxxxxxxxxxxxxxxx; LKML;
> devel@xxxxxxxxxxxxxxxxxxxxxx; olaf@xxxxxxxxx; apw@xxxxxxxxxxxxx;
> jasowang@xxxxxxxxxx; 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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