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mm: memory-failure: ensure moving HWPoison flag to the raw error pages 

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.

Link: https://lkml.kernel.org/r/20230711055016.2286677-3-linmiaohe@huawei.com
Fixes: ac5fcde0a9 ("mm, hwpoison: make unpoison aware of raw error info in hwpoisoned hugepage")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2023-07-11 13:50:10 +08:00 committed by Andrew Morton
parent dbe70dbb41
commit 92a025a790
1 changed files with 2 additions and 0 deletions
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2
mm/memory-failure.c
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@ -1908,6 +1908,8 @@ void folio_clear_hugetlb_hwpoison(struct folio *folio)
{
if (folio_test_hugetlb_raw_hwp_unreliable(folio))
return;
if (folio_test_hugetlb_vmemmap_optimized(folio))
return;
folio_clear_hwpoison(folio);
folio_free_raw_hwp(folio, true);
}