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mm: memory-failure: avoid false hwpoison page mapped error info

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folio->_mapcount is overloaded in SLAB, so folio_mapped() has to be done
after folio_test_slab() is checked. Otherwise slab folio might be treated
as a mapped folio leading to false 'Someone maps the hwpoison page' error
info.

Link: https://lkml.kernel.org/r/20230727115643.639741-4-linmiaohe@huawei.com
Fixes: 230ac719c5 ("mm/hwpoison: don't try to unpoison containment-failed pages")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2023-07-27 19:56:42 +08:00 committed by Andrew Morton
parent f29623e4a5
commit faeb2ff2c1
1 changed files with 7 additions and 3 deletions
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10
mm/memory-failure.c
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@ -2499,6 +2499,13 @@ int unpoison_memory(unsigned long pfn)
goto unlock_mutex;
}
if (folio_test_slab(folio) || PageTable(&folio->page) || folio_test_reserved(folio))
goto unlock_mutex;
/*
* Note that folio->_mapcount is overloaded in SLAB, so the simple test
* in folio_mapped() has to be done after folio_test_slab() is checked.
*/
if (folio_mapped(folio)) {
unpoison_pr_info("Unpoison: Someone maps the hwpoison page %#lx\n",
pfn, &unpoison_rs);
@ -2511,9 +2518,6 @@ int unpoison_memory(unsigned long pfn)
goto unlock_mutex;
}
if (folio_test_slab(folio) || PageTable(&folio->page) || folio_test_reserved(folio))
goto unlock_mutex;
ghp = get_hwpoison_page(p, MF_UNPOISON);
if (!ghp) {
if (PageHuge(p)) {