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Subject: Re: [PATCH] Attempt to clarify "Augmented Trees" section of
 Documentation/rbtree.txt
From: Peter Zijlstra <peterz@infradead.org>
To: Rob Landley <rlandley@parallels.com>
Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
        Pallipadi Venkatesh <venkatesh.pallipadi@intel.com>,
        Suresh Siddha <suresh.b.siddha@intel.com>,
        Randy Dunlap <rdunlap@xenotime.net>
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Date: Fri, 15 Apr 2011 12:52:10 +0200
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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?