linux-kernel - Re: [PATCH] Attempt to clarify "Augmented Trees" section of Documentation/rbtree.txt

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Message-ID: <1302864730.2388.237.camel@twins>
Date:	Fri, 15 Apr 2011 12:52:10 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rob Landley <rlandley@...allels.com>
Cc:	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Pallipadi Venkatesh <venkatesh.pallipadi@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH] Attempt to clarify "Augmented Trees" section of
 Documentation/rbtree.txt

On Thu, 2011-04-14 at 14:22 -0500, Rob Landley wrote:
> +This function is called when either of a node's children change.  It is not
> +called recursively: the callback function is responsible for traversing parent
> +nodes and updating their information as necessary. 

static void rb_augment_path(struct rb_node *node, rb_augment_f func, void *data)
{
        struct rb_node *parent;

up:
        func(node, data);
        parent = rb_parent(node);
        if (!parent)
                return;

        if (node == parent->rb_left && parent->rb_right)
                func(parent->rb_right, data);
        else if (parent->rb_left)
                func(parent->rb_left, data);

        node = parent;
        goto up;
}

Uhm, what?
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