The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x faeb2ff2c1c5cb60ce0da193580b256c941f99ca # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable@xxxxxxxxxxxxxxx>' --in-reply-to '2023081231-daintily-hurry-4b95@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^.. Possible dependencies: faeb2ff2c1c5 ("mm: memory-failure: avoid false hwpoison page mapped error info") f29623e4a599 ("mm: memory-failure: fix potential unexpected return value from unpoison_memory()") a6fddef49eef ("mm/memory-failure: convert unpoison_memory() to folios") 9637d7dfb19c ("mm/memory-failure: convert free_raw_hwp_pages() to folios") 2ff6cecee669 ("mm/memory-failure: convert hugetlb_clear_page_hwpoison to folios") bc1cfde19467 ("mm/memory-failure: convert try_memory_failure_hugetlb() to folios") 911565b82853 ("mm/hugetlb: convert destroy_compound_gigantic_page() to folios") e0ff42804233 ("mm/memory-failure.c: cleanup in unpoison_memory") cb67f4282bf9 ("mm,thp,rmap: simplify compound page mapcount handling") dad6a5eb5556 ("mm,hugetlb: use folio fields in second tail page") f074732d599e ("mm/hugetlb_cgroup: convert hugetlb_cgroup_from_page() to folios") a098c977722c ("mm/hugetlb_cgroup: convert __set_hugetlb_cgroup() to folios") 5033091de814 ("mm/hwpoison: introduce per-memory_block hwpoison counter") a46c9304b4bb ("mm/hwpoison: pass pfn to num_poisoned_pages_*()") d027122d8363 ("mm/hwpoison: move definitions of num_poisoned_pages_* to memory-failure.c") e591ef7d96d6 ("mm,hwpoison,hugetlb,memory_hotplug: hotremove memory section with hwpoisoned hugepage") b66d00dfebe7 ("mm: memory-failure: make action_result() return int") 4781593d5dba ("mm/hugetlb: unify clearing of RestoreReserve for private pages") 149562f75094 ("mm/hugetlb: add hugetlb_folio_subpool() helpers") d340625f4849 ("mm: add private field of first tail to struct page and struct folio") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From faeb2ff2c1c5cb60ce0da193580b256c941f99ca Mon Sep 17 00:00:00 2001 From: Miaohe Lin <linmiaohe@xxxxxxxxxx> Date: Thu, 27 Jul 2023 19:56:42 +0800 Subject: [PATCH] mm: memory-failure: avoid false hwpoison page mapped error info 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@xxxxxxxxxx Fixes: 230ac719c500 ("mm/hwpoison: don't try to unpoison containment-failed pages") Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Acked-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx> Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> diff --git a/mm/memory-failure.c b/mm/memory-failure.c index b32d370b5d43..9a285038d765 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -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)) {
