linux-kernel - Re: [PATCH RFC] struct list

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Message-ID: <alpine.LFD.0.98.0706101317090.14121@woody.linux-foundation.org>
Date:	Sun, 10 Jun 2007 13:19:36 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] struct list_node

On Sun, 10 Jun 2007, Linus Torvalds wrote:
> 
> The Linux kernel list.h is _better_ than most stupid list implementations 
> that think that a head node is different from the list node. Exactly 
> because it very naturally supports the notion of "this structure exists in 
> a 'ring of entries'" where each node is 100% equivalent to any other node, 
> and there _is_ no head.

Btw, to extend a bit on this: there actually *is* a "list with a head" 
implementation in <linux/list.h>, called "hlist".

Now, the "h" actually historically stands for "hash", but if you prefer, 
you can think of it as standing for "head", and be happy.

And if you want a head, you really do want to use "hlist", since the head 
is smaller than a list entry (a single pointer rather than two).

And yes, I'm sure we could change some "struct list" users to "struct 
hlist" if you wanted to.

		Linus
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