why INITIAL_JIFFIES is -300 * HZ?

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Subject: why INITIAL_JIFFIES is -300 * HZ?
From: Nagaprabhanjan Bellari <nagp.knb@xxxxxxxxx>
Date: Tue, 20 Apr 2010 11:09:43 +0530

I am curious to know why jiffies is initialized with INITIAL_JIFFIES which is -300 * HZ? It is mentioned in the source that jiffies, when initialized with this value, will make it overflow in 5 minutes.

Can somebody tell me how it helps in dealing with jiffy overflow issues at a later point in time?

Thanks,

-nagp

Follow-Ups:
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  - From: Robert P. J. Day
- Re: why INITIAL_JIFFIES is -300 * HZ?
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