linux-kernel - Re: [PATCH] Change ZERO_SIZE_PTR to point at unmapped space

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Message-ID: <alpine.LFD.2.01.0905301528540.3435@localhost.localdomain>
Date:	Sat, 30 May 2009 15:29:39 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Larry H." <research@...reption.com>
cc:	linux-mm@...ck.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Change ZERO_SIZE_PTR to point at unmapped space



On Sat, 30 May 2009, Larry H. wrote:
> 
> The ZERO_OR_NULL_PTR macro is changed accordingly. This patch does
> not modify its behavior nor has any performance nor functionality
> impact.

I'm sure it makes a code generation difference, with (a) big constants and 
(b) no longer possible to merge the conditional into one single one.

		Linus
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