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Date: Thu, 1 Nov 2001 13:34:41 -0500
From: Benjamin LaHaise <bcrl@redhat.com>
To: "Richard B. Johnson" <root@chaos.analogic.com>
Cc: vda <vda@port.imtp.ilyichevsk.odessa.ua>,
        Tim Schmielau <tim@physik3.uni-rostock.de>,
        Andreas Dilger <adilger@turbolabs.com>, linux-kernel@vger.kernel.org,
        J Sloan <jjs@lexus.com>
Subject: Re: [Patch] Re: Nasty suprise with uptime
Message-ID: <20011101133441.E11773@redhat.com>
In-Reply-To: <20011101120222.B11773@redhat.com> <Pine.LNX.3.95.1011101125206.1496A-100000@chaos.analogic.com>
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In-Reply-To: <Pine.LNX.3.95.1011101125206.1496A-100000@chaos.analogic.com>; from root@chaos.analogic.com on Thu, Nov 01, 2001 at 01:03:32PM -0500
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On Thu, Nov 01, 2001 at 01:03:32PM -0500, Richard B. Johnson wrote:
> does the jumps on condition and tests for zero, even after the
> flags have been set by the previous operation, I tested what
> the result was. It turns out that it's only a couple of clock
> cycles, not the 6 extra clocks that the hand calculation shows.

*sigh*  You're not testing any of the effects on available execution 
resources within the processor.

> So, if you leave jiffies alone, but bump another variable when it
> wraps, you get to eat your cake and keep it too.

As Linus pointed out, using casting tricks with a long long will just 
work for this case.  Sounds good to me.

		-ben
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