linux-kernel - RE: [ 011/171] ptp: update adjfreq callback description

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Date:	Mon, 26 Nov 2012 21:16:56 +0000
From:	"Keller, Jacob E" <jacob.e.keller@...el.com>
To:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>,
	Richard Cochran <richard.cochran@...il.com>,
	John Stultz <john.stultz@...aro.org>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: RE: [ 011/171] ptp: update adjfreq callback description

> -----Original Message-----
> From: Herton Ronaldo Krzesinski [mailto:herton.krzesinski@...onical.com]
> Sent: Friday, November 23, 2012 4:27 PM
> To: Greg Kroah-Hartman
> Cc: linux-kernel@...r.kernel.org; stable@...r.kernel.org;
> alan@...rguk.ukuu.org.uk; Keller, Jacob E; Richard Cochran; John Stultz;
> Kirsher, Jeffrey T; David S. Miller
> Subject: Re: [ 011/171] ptp: update adjfreq callback description
> 
> On Wed, Nov 21, 2012 at 04:39:17PM -0800, Greg Kroah-Hartman wrote:
> > 3.4-stable review patch.  If anyone has any objections, please let me
> know.
> >
> > ------------------
> >
> > From: Jacob Keller <jacob.e.keller@...el.com>
> >
> > commit 87f4d7c1d36f44b0822053b7e5dedc31fdd0ab99 upstream.
> >
> > This patch updates the adjfreq callback description to include a note
> that the
> > delta in ppb is always relative to the base frequency, and not to the
> current
> > frequency of the hardware clock.
> >
> > Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
> > CC: Richard Cochran <richard.cochran@...il.com>
> > CC: John Stultz <john.stultz@...aro.org>
> > Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> > Signed-off-by: David S. Miller <davem@...emloft.net>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> >
> > ---
> >  include/linux/ptp_clock_kernel.h |    3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > --- a/include/linux/ptp_clock_kernel.h
> > +++ b/include/linux/ptp_clock_kernel.h
> > @@ -50,7 +50,8 @@ struct ptp_clock_request {
> >   * clock operations
> >   *
> >   * @adjfreq:  Adjusts the frequency of the hardware clock.
> > - *            parameter delta: Desired period change in parts per
> billion.
> > + *            parameter delta: Desired frequency offset from nominal
> frequency
> > + *            in parts per billion
> >   *
> >   * @adjtime:  Shifts the time of the hardware clock.
> >   *            parameter delta: Desired change in nanoseconds.
> >
> 
> This was marked for only 3.5 or later on the original changelog:
> "CC: stable@...r.kernel.org [v3.5+]"
> 
> --
> []'s
> Herton

Originally didn't notice how far back PTP went.

-Jake
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