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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>
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@ -1908,6 +1908,8 @@ void folio_clear_hugetlb_hwpoison(struct folio *folio)
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{
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if (folio_test_hugetlb_raw_hwp_unreliable(folio))
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return;
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if (folio_test_hugetlb_vmemmap_optimized(folio))
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return;
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folio_clear_hwpoison(folio);
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folio_free_raw_hwp(folio, true);
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}
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