[PATCH 01/12] kho: generalize radix tree APIs

[Jork Loeser]

On Wed, 29 Apr 2026, Pratyush Yadav wrote:

> From: "Pratyush Yadav (Google)" <pratyush at kernel.org>
>
> The KHO radix tree is a data structure that can track the presence or
> absence of an arbitrary key, with nothing inherently tied to KHO memory
> preservation tracking. This was one of the design goals of the radix
> tree. This was done to enable it to be re-used by other users of KHO.

"Arbitrary key": Not quite the complete 64-bits, rather 64 - PAGE_SIZE, 
correct?

> + * kho_radix_add_key - Add a key to the radix tree.
>  * @tree: The KHO radix tree.
> + * @key: The key to add.
>  *
> + * This function traverses the radix tree based on the key provided. It sets the
> + * corresponding bit in the leaf bitmap to mark the key as present. If
> + * intermediate nodes do not exist along the path, they are allocated and added
> + * to the tree.

Consider adding a note on the key-width limitation.

Best,
Jork