linux-kernel - Re: [PATCH] LinuxPPS (with new syscalls API)

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Message-Id: <1184145467.17833.24.camel@pmac.infradead.org>
Date:	Wed, 11 Jul 2007 10:17:47 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Rodolfo Giometti <giometti@...eenne.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] LinuxPPS (with new syscalls API) - new version

On Tue, 2007-07-10 at 18:38 +0200, Rodolfo Giometti wrote:
> On Tue, Jul 10, 2007 at 05:05:47PM +0100, David Woodhouse wrote:
> > 
> > I'm sure the version with 'volatile' will also be broken then. Sounds
> > like the right answer is to fix the locking.
> 
> But wish avoiding locking at all since this may delay the time stamp
> recording. We (the LinuxPPS guys) niticed that just a single
> instruction my degrade the time setting about 50%!
> 
> I avoid locking just using a pointer and setting it to a dummy
> structure when not used... is that wrong? :-o

Almost certainly (admittedly said without looking).

-- 
dwmw2

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