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Date: Tue, 10 Feb 2009 15:54:52 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Rodolfo Giometti <giometti@linux.it>
Cc: linux-kernel@vger.kernel.org, dwmw2@infradead.org, davej@redhat.com,
       sam@ravnborg.org, greg@kroah.com, randy.dunlap@oracle.com,
       kay.sievers@vrfy.org, alan@lxorguk.ukuu.org.uk, hpa@zytor.com,
       mingo@elte.hu, mtk.manpages@gmail.com, hch@infradead.org
Subject: Re: LinuxPPS core (Version 2): the PPS Linux implementation.
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On Tue, 10 Feb 2009 15:05:51 +0100
Rodolfo Giometti <giometti@linux.it> wrote:

> This patch adds the PPS core support into Linux.
> 
> Currently I just propose the "core" so after inclusion we can add all
> other related stuff as suggested by several people in this list. :)
> 
> PPS means "pulse per second" and its API is specified by RFC 2783
> (Pulse-Per-Second API for UNIX-like Operating Systems, Version 1.0).
> 
> The code has been tested with the NTPD program
> (http://www.eecis.udel.edu/~mills/ntp/html/index.html) and several GPS
> antennae.
> 
> 
> Changelog
> =========
> 
> Version 1 -> 2
> --------------
> 
> * fix race during PPS source registration.
> 
> * PPS_CHECK removed.
> 
> * not needed check in pps_exit() removed.
> 
> * Printing stuff on exit removed.
> 
> Version [full patchset] -> 1
> ----------------------------
> 
> * stupid filenames removed.
> 
> * kernel-doc documentation of exported symbols.
> 
> * old BKL-locked ioctl removed.
> 
> * !uarg checks in the ioctls removed.
> 
> * pps.h revisited but not splitted, since several stuff are shared between
>   kernel and user land (I hope this will not stop inclusion...)
> 

Is it hard to do this?  Just a matter of putting some things into
pps_user.h, others into pps_kernel.h and then including both into
pps.h?