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

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Message-ID: <alpine.LFD.2.01.0907101249060.3352@localhost.localdomain>
Date:	Fri, 10 Jul 2009 12:52:18 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Joerg Roedel <joerg.roedel@....com>
Subject: Re: [GIT PULL] core kernel fixes

On Fri, 10 Jul 2009, Ingo Molnar wrote:
> > 
> > but I really migth have done soemthing wrong there. It's a simple 
> > function, but somebody needs to double-check that I haven't made 
> > it worse.
> 
> Looks correct to me.

Note, I didn't look at how 'end' works, and it really does matter if 'end' 
is an "inclusive" or "exclusive" end pointer address. So my replacement 
overlap() function was written more as a conceptual patch - I did not 
check the exact semantics of the arguments passed in.

If 'end' is exclusive, then 'b1' should be calculated as 'a1+size-1', 
because the ranges must have the same rules. And then you should use the 
'strict inequality' operators for testing the ranges.

		Linus
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