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To: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] make jiffies wrap 5 min after boot
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From: Falk Hueffner <falk.hueffner@student.uni-tuebingen.de>
Date: 16 Feb 2003 12:50:34 +0100
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Muli Ben-Yehuda <mulix@mulix.org> writes:

> On Sun, Feb 16, 2003 at 01:37:40AM -0500, Robert Love wrote:
> > On Sat, 2003-02-15 at 21:43, William Lee Irwin III wrote:
> > 
> > > Can I get a vote for ~0UL instead of -1UL?
> > 
> > OK, I bite.  What is the difference?  Aren't both equivalent?
> 
> I have no idea if that's what wli meant, but -1UL is only "all ones"
> in a 2's complement binary representation. 

No. Wraparound of unsigned types is well-defined. -1UL must be the
largest possible unsigned long value, which must consist of only 1
bits (except for possible padding bits).

Of course, no machines with ones-complement (or padding bits, or
integer trap representations, or any of the other ISO braindamages)
exist, so this is mostly irrelevant anyway.

-- 
	Falk
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