linux-kernel - Re: [patch] radix-tree: use indirect bit

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Message-Id: <20070806114055.704b78d8.akpm@linux-foundation.org>
Date:	Mon, 6 Aug 2007 11:40:55 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch] radix-tree: use indirect bit

On Thu, 2 Aug 2007 07:24:46 +0200 Nick Piggin <npiggin@...e.de> wrote:

> Rather than sign direct radix-tree pointers with a special bit, sign
> the indirect one that hangs off the root. This means that, given a
> lookup_slot operation, the invalid result will be differentiated from
> the valid (previously, valid results could have the bit either set or
> clear).
> 
> This does not affect slot lookups which occur under lock -- they
> can never return an invalid result. Is needed in future for lockless
> pagecache.

so.. we added 30 bytes of text to radix-tree.o for no purpose?
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