Re: [PATCH] radix-tree: optimization for radix_tree_init_maxnodes

[Matthew Wilcox]

On Sun, Sep 09, 2018 at 09:21:00PM +0800, Wang Long wrote:
> if i == 0, height_to_maxnodes[i] = 0,
> if i >= 1, height_to_maxnodes[i] = height_to_maxnodes[i-1]
> 				+ __maxindex(i-1) + 1.
> 
> so delete height_to_maxindex and optimize the calculation of
> height_to_maxnodes array.

Thanks for your patch.  Unfortunately, this entire function is scheduled
for deletion, so I won't be applying it.

If you're interested in the radix tree, I'd recommend looking at its
replacement, the XArray.  The current version is at
http://git.infradead.org/users/willy/linux-dax.git/shortlog/refs/heads/xarray
but I'll be pushing another version out in the next few days.