Re: [PATCH 2/8] mm: memory-failure: ensure moving HWPoison flag to the raw error pages

[Naoya Horiguchi]

On Sat, Jul 08, 2023 at 04:57:38PM +0800, Miaohe Lin wrote:
> If hugetlb_vmemmap_optimized is enabled, folio_clear_hugetlb_hwpoison()
> called from try_memory_failure_hugetlb() won't transfer HWPoison flag to
> subpages while folio's HWPoison flag is cleared. So when trying to free
> this hugetlb page into buddy, folio_clear_hugetlb_hwpoison() is not called
> to move HWPoison flag from head page to the raw error pages even if now
> hugetlb_vmemmap_optimized is cleared. This will results in HWPoisoned page
> being used again and raw_hwp_page leak.
> 
> Fixes: ac5fcde0a96a ("mm, hwpoison: make unpoison aware of raw error info in hwpoisoned hugepage")
> Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>

Acked-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>