Re: [PATCH 02/16] radixtree: sync with mainline

[Wu Fengguang <wfg@mail.ustc.edu.cn>]

On Mon, Dec 05, 2005 at 09:24:18AM -0800, Christoph Lameter wrote:
> On Mon, 5 Dec 2005, Wu Fengguang wrote:
> 
> >         return slot;
> > 
> > It should be
> > 
> >         return &slot;
> 
> That wont work. slot is a local variable. Drop this patch please.

Thanks. Sorry for the careless mistake.

But your patch do fit well in my patch :)

void *radix_tree_lookup_node(struct radix_tree_root *root,
                                unsigned long index, unsigned int level)
{
        unsigned int height, shift;
        struct radix_tree_node *slot;

        height = root->height;
        if (index > radix_tree_maxindex(height))
                return NULL;

        shift = (height-1) * RADIX_TREE_MAP_SHIFT;
        slot = root->rnode;

        while (height > level) {
                if (slot == NULL)
                        return NULL;

                slot = slot->slots[(index >> shift) & RADIX_TREE_MAP_MASK];
                shift -= RADIX_TREE_MAP_SHIFT;
                height--;
        }

        return slot;
}

void **radix_tree_lookup_slot(struct radix_tree_root *root, unsigned long index)
{
        struct radix_tree_node *node;

        node = radix_tree_lookup_node(root, index, 1);
        return node->slots + (index & RADIX_TREE_MAP_MASK);
}
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