linux-kernel - Re: [PATCH RFC V2 4/6] time: introduce leap second functional interface

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Message-ID: <20120522042534.GA2184@netboy.at.omicron.at>
Date:	Tue, 22 May 2012 06:25:34 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH RFC V2 4/6] time: introduce leap second functional
 interface

On Mon, May 21, 2012 at 01:24:57PM -0700, John Stultz wrote:
> On 05/21/2012 12:18 PM, Richard Cochran wrote:
> Hrm.  I prefer to keep things fairly flat (even having time.h and
> timex.h bugs me somewhat).  But having such a separation could be
> useful, but maybe at a slightly more coarse level. Something like
> timekeeping-internal.h and time.h, splitting all the general
> accessors away from the non-general.

Yes, time.h is full of stuff not really for public use. When compiling
on an atom netbook as I do, it gets really noticeable and annoying
when you tweak some private prototype, and then the whole darn kernel
rebuilds.

> The locking order is pretty straight forward: timekeeper.lock ->
> ntp_lock.   This only gets messy when you require timekeeping data
> from the ntp context, but usually we provide the required data via
> the caller.  But better documentation is always welcome.

The icky part is the fact that ntp would need access to timekeeper
state while holding ntp_lock.

Richard
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