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 GHIlTDMA 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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 11/20/25 14:59, Zi Yan wrote: > min_order_for_split() returns -EBUSY when the folio is truncated and cannot > be split. In commit 77008e1b2ef7 ("mm/huge_memory: do not change > split_huge_page*() target order silently"), memory_failure() does not > handle it and pass -EBUSY to try_to_split_thp_page() directly. > try_to_split_thp_page() returns -EINVAL since -EBUSY becomes 0xfffffff0 as > new_order is unsigned int in __folio_split() and this large new_order is > rejected as an invalid input. The code does not cause a bug. > soft_offline_in_use_page() also uses min_order_for_split() but it always > passes 0 as new_order for split. > > Handle it properly by checking min_order_for_split() return value and not > calling try_to_split_thp_page() if the value is negative. Add a comment > in soft_offline_in_use_page() to clarify the possible negative new_order > value. > > Signed-off-by: Zi Yan > --- > mm/memory-failure.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/mm/memory-failure.c b/mm/memory-failure.c > index 7f908ad795ad..86582f030159 100644 > --- a/mm/memory-failure.c > +++ b/mm/memory-failure.c > @@ -2437,8 +2437,11 @@ int memory_failure(unsigned long pfn, int flags) > * or unhandlable page. The refcount is bumped iff the > * page is a valid handlable page. > */ > - folio_set_has_hwpoisoned(folio); > - err = try_to_split_thp_page(p, new_order, /* release= */ false); > + if (new_order >= 0) { > + folio_set_has_hwpoisoned(folio); if new_order < 0, do we skip setting hwpoisioned bit on the folio? > + err = try_to_split_thp_page(p, new_order, /* release= */ false); > + } else > + err = new_order; > /* > * If splitting a folio to order-0 fails, kill the process. > * Split the folio regardless to minimize unusable pages. > @@ -2779,6 +2782,7 @@ static int soft_offline_in_use_page(struct page *page) > /* > * If new_order (target split order) is not 0, do not split the > * folio at all to retain the still accessible large folio. > + * new_order can be -EBUSY, meaning the folio cannot be split. > * NOTE: if minimizing the number of soft offline pages is > * preferred, split it to non-zero new_order like it is done in > * memory_failure(). Balbir