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Add kho_radix_destroy_tree() which allows destroying the radix tree and freeing all its pages. This is will be used by the upcoming scratch extension mechanism. It creates a radix tree to track free blocks and then frees them after telling memblock about them. Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com> Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org> Link: https://patch.msgid.link/20260801084833.1897543-12-pratyush@kernel.org Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>