Re: [PATCH] mm, hugetlb: Increment the number of pages to be reset on HVO

[Muchun Song]

> On Apr 15, 2025, at 19:18, Oscar Salvador <osalvador@xxxxxxx> wrote:
> 
> commit 4eeec8c89a0c ("mm: move hugetlb specific things in folio to page[3]")
> shifted hugetlb specific stuff, and now mapping overlaps _hugetlb_cgroup field.
> 
> Upon restoring the vmemmap for HVO, only the first two tail pages are reset, and
> this causes the check in free_tail_page_prepare() to fail as it finds
> an unexpected mapping value in some tails.
> 
> Increment the number of pages to be reset to 4 (head + 3 tail pages)
> 
> Fixes: 4eeec8c89a0c ("mm: move hugetlb specific things in folio to page[3]")
> Suggested-by: David Hildenbrand <david@xxxxxxxxxx>
> Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>

Reviewed-by: Muchun Song <muchun.song@xxxxxxxxx>

Thanks.