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 4K8+RiIi 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4 Feb 2026, at 22:25, Miaohe Lin wrote: > On 2026/2/5 8:56, Zi Yan wrote: >> When !CONFIG_TRANSPARENT_HUGEPAGE, a non-folio compound page can appear = in >> a userspace mapping via either vm_insert_*() functions or >> vm_operatios_struct->fault(). They are not folios, thus should not be >> considered for folio operations like split. Change memory_failure() and >> soft_offline_page() to reject these non-folio compound pages as >> EOPNOTSUPP. >> >> Add PageNonFolioCompound() helper function. This function is functionall= y >> equivalent to folio_test_large() && !folio_test_large_rmappable(), but i= t >> is supposed to be used on struct page. So open code it instead. >> >> Fixes: 689b8986776c ("mm/memory-failure: improve large block size folio = handling") >> Reported-by: =E6=98=AF=E5=8F=82=E5=B7=AE >> Closes: https://lore.kernel.org/all/PS1PPF7E1D7501F1E4F4441E7ECD056DEADA= B98A@PS1PPF7E1D7501F.apcprd02.prod.outlook.com/ >> Signed-off-by: Zi Yan >> --- >> include/linux/page-flags.h | 16 ++++++++++++++++ >> mm/memory-failure.c | 9 ++++++--- >> 2 files changed, 22 insertions(+), 3 deletions(-) >> >> diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h >> index f7a0e4af0c73..2fe8047f42a3 100644 >> --- a/include/linux/page-flags.h >> +++ b/include/linux/page-flags.h >> @@ -1102,6 +1102,22 @@ static inline bool folio_contain_hwpoisoned_page(= struct folio *folio) >> >> bool is_free_buddy_page(const struct page *page); >> >> +static inline bool PageNonFolioCompound(const struct page *page) >> +{ >> + if (PageCompound(page)) { >> + const struct page *head =3D compound_head(page); >> + >> + /* >> + * Without CONFIG_TRANSPARENT_HUGEPAGE, PG_large_rmappable >> + * should not be set/used. >> + */ >> + return !IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) || >> + !test_bit(PG_large_rmappable, &head[1].flags.f); >> + } >> + >> + return false; >> +} >> + >> #ifdef CONFIG_MIGRATION >> /* >> * This page is migratable through movable_ops (for selected typed page= s >> diff --git a/mm/memory-failure.c b/mm/memory-failure.c >> index cf0d526e6d41..8b6b5950bb66 100644 >> --- a/mm/memory-failure.c >> +++ b/mm/memory-failure.c >> @@ -2440,9 +2440,12 @@ int memory_failure(unsigned long pfn, int flags) >> >> folio =3D page_folio(p); >> >> - /* filter pages that are protected from hwpoison test by users */ >> + /* >> + * filter pages that are protected from hwpoison test by users or >> + * unsupported non folio compound ones >> + */ >> folio_lock(folio); >> - if (hwpoison_filter(p)) { >> + if (hwpoison_filter(p) || PageNonFolioCompound(p)) { >> ClearPageHWPoison(p); >> folio_unlock(folio); >> folio_put(folio); >> @@ -2945,7 +2948,7 @@ int soft_offline_page(unsigned long pfn, int flags= ) >> ret =3D get_hwpoison_page(page, flags | MF_SOFT_OFFLINE); >> put_online_mems(); >> >> - if (hwpoison_filter(page)) { >> + if (hwpoison_filter(page) || PageNonFolioCompound(page)) { > > There should be no problem in soft_offline_page(). HWPoisonHandlable() ch= eck will be used > by get_hwpoison_page() to reject PageNonFolioCompound folios. Or am I mis= s something? I did not know that. Why does memory_failure() not call HWPosonHandlable() = to check the input page? It looks to me that HWPosonHandlable() is more appropriate than PageN= onFolioCompound() here. -- Best Regards, Yan, Zi