Re: [PATCH v5 10/12] mm/sparse-vmemmap: drop the extra tail page from device DAX reservation

[David Hildenbrand (Arm)]

On 9/27/26 04:54, Muchun Song wrote:
> The device DAX vmemmap population still reserves one extra tail vmemmap
> page after the head page.
> 
> Drop that extra reservation and let the shared tail page cover all tail
> vmemmap pages after the head page, so DAX follows the same reservation
> model as HugeTLB.
> 
> This reduces the reserved vmemmap pages for optimized DAX mappings to
> one and removes the now-unneeded first-tail population from the generic
> and powerpc paths to simplify the code as well.
> 
> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> Acked-by: Qi Zheng <qi.zheng@xxxxxxxxx>
> ---

Acked-by: David Hildenbrand (Arm) <david@xxxxxxxxxx>

-- 
Cheers,

David