Re: [PATCH v2 4/5] mm: hugetlb: avoid recursive CMA allocation during migration

[Jose A. Perez de Azpillaga]

On 10/22/26 9:31 AM, Qi Zheng wrote:
> From: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
> 
> Contiguous allocation can migrate allocated HugeTLB folios or replace free
> HugeTLB folios while holding a CMA allocation mutex. Allocating a
> replacement through CMA would recurse into that allocation path once
> non-gigantic HugeTLB pages can use CMA.
> 
> Pass allow_cma through the migration and fresh allocation helpers, and
> disable it for MR_CONTIG_RANGE and free folio replacement. Move the CMA
> attempt into the common allocation path, retaining the gigantic size
> restriction. Honor hugetlb_cma_only even when allow_cma is false.
> 
> The existing gigantic migration restriction is unchanged.
> 
> Assisted-by: LLM
> Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
LGTM so:

Reviewed-by: Jose A. Perez de Azpillaga <azpijr@xxxxxxxxx>

-- 
cheers,
jose a. p-a