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Re: [Xen-devel] [timer/ticks related] dom0 hang during boot on large 1TB

To: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>, Steve Ofsthun <steve.ofsthun@xxxxxxxxxx>
Subject: Re: [Xen-devel] [timer/ticks related] dom0 hang during boot on large 1TB system
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 22 Dec 2009 08:05:28 +0000
Cc: Hackel <kurt.hackel@xxxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "Xen-devel@xxxxxxxxxxxxxxxxxxx" <Xen-devel@xxxxxxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "Kurt@xxxxxxxxxxxxxxxxxxxx" <Kurt@xxxxxxxxxxxxxxxxxxxx>
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On 22/12/2009 07:59, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote:

>> For wrapping, unsigned comparision must be done, which is also the jiffies
>> data type. 
> If you do 32-bit unsigned comparisons, that is broken by jiffies wrapping,
> the fixing of which was the whole point of the comparison macros.

I'm talking about '(ulong)b<(ulong)a' here of course. '(ulong)b-(ulong)a<0'
would always be false, which is even less useful.

 -- Keir

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