linux-kernel - Re: [PATCH v2 2/9] rbtree: optimize fetching of sibling node

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Message-ID: <1344263015.27828.58.camel@twins>
Date:	Mon, 06 Aug 2012 16:23:35 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	riel@...hat.com, daniel.santos@...ox.com, aarcange@...hat.com,
	dwmw2@...radead.org, akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH v2 2/9] rbtree: optimize fetching of sibling node

On Thu, 2012-08-02 at 15:34 -0700, Michel Lespinasse wrote:

> +		tmp = gparent->rb_right;
> +		if (parent != tmp) {	/* parent == gparent->rb_left */

> +			tmp = parent->rb_right;
> +			if (node == tmp) {

> +			tmp = parent->rb_left;
> +			if (node == tmp) {

> +		sibling = parent->rb_right;
> +		if (node != sibling) {	/* node == parent->rb_left */


Half of them got a comment, the other half didn't.. is there any
particular reason for that?
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