linux-kernel - Re: [GIT PULL] core kernel fixes

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Message-ID: <20090713145256.GI19087@amd.com>
Date:	Mon, 13 Jul 2009 16:52:56 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [GIT PULL] core kernel fixes

On Fri, Jul 10, 2009 at 12:06:23PM -0700, Linus Torvalds wrote:
> What am I missing (apart from the fact that all those variables are 
> horribly badly named)?
> 
> Also, the tests make no sense. That's not how you are supposed to check 
> for overlap to begin with.

The tests made sense in my brain when I wrote that function ;-) My code
checked for possible overlap scenarios. I havn't thought about doing it
much much simpler...

> 
> Isn't it easier to test for _not_ overlapping?
> 
> 	/* range1 is fully before range2 */
> 	(end1 <= start2 || 
> 	/* range1 is fully after range2 */
> 	start1 >= end2)

... by checking for non-overlap and negating the result. But now I know
better :-)

	Joerg


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