[PATCH 06/12] kho: allow early-boot usage of the KHO radix tree

[Mike Rapoport]

On Wed, Apr 29, 2026 at 03:39:08PM +0200, Pratyush Yadav wrote:
> From: "Pratyush Yadav (Google)" <pratyush at kernel.org>
> 
> The KHO radix tree allocates memory for table pages from the buddy
> allocator using get_zeroed_page(). This is not available in early boot
> when memblock is still active.
> 
> Using the radix tree in early boot is useful for KHO to track metadata
> about its memory. One such example is for tracking free blocks for
> memory allocation when scratch runs out of space. This feature will be
> added in the following commits.
> 
> Add kho_radix_{alloc,free}_node() which allocate and free the table
> pages. They use slab_is_available() to decide which allocator to use.
> While slab_is_available() indicates availability of the slab allocator,
> it gets initialized right before buddy so it serves the same practical

                           ^ after?

> purpose.
> 
> Signed-off-by: Pratyush Yadav (Google) <pratyush at kernel.org>
> ---
>  kernel/liveupdate/kexec_handover.c | 24 ++++++++++++++++++++++--
>  1 file changed, 22 insertions(+), 2 deletions(-)

-- 
Sincerely yours,
Mike.