linux-kernel - Re: [PATCH NET-NEXT 01/10] clocksource: allow usage independent of timekeeping.c

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Message-Id: <1233775542.6994.13.camel@localhost.localdomain>
Date:	Wed, 04 Feb 2009 11:25:42 -0800
From:	john stultz <johnstul@...ibm.com>
To:	Daniel Walker <dwalker@...o99.com>
Cc:	Patrick Ohly <patrick.ohly@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH NET-NEXT 01/10] clocksource: allow usage independent of
	timekeeping.c

On Wed, 2009-02-04 at 07:09 -0800, Daniel Walker wrote:
> On Wed, 2009-02-04 at 15:46 +0100, Patrick Ohly wrote:
> > In an earlier revision of the patch I had adapted clocksource itself so
> > that it could be used outside of the time keeping code; John wanted me
> > to use these smaller structs instead that you now find in the current
> > patch.
> 
> Well, I think your original idea was better.. I don't think we need the
> duplication of underlying clocksource mechanics.
> 
> > Eventually John wants to refactor clocksource so that it uses them and
> > just adds additional elements in clocksource. Right now clocksource is a
> > mixture of different concepts. Breaking out cyclecounter and timecounter
> > is a first step towards that cleanup.
> 
> The problem I see is that your putting off the cleanup of struct
> clocksource with duplication.. It should go in reverse , you should use
> clocksources for your patch set. Which will motivate John to clean up
> the clocksource structure.

I strongly disagree. Misusing a established structure for unintended use
is just bad. What Patrick wants to use the counters for has very
different semantics then how clocksources are used.

I think having a bit of redundancy in two structures is good motivation
for me to clean up the clocksources to use cyclecounters.

thanks
-john

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