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Zi Yan
77008e1b2e
Page cache folios from a file system that support large block size (LBS) can have minimal folio order greater than 0, thus a high order folio might not be able to be split down to order-0. Commite220917fa5("mm: split a folio in minimum folio order chunks") bumps the target order of split_huge_page*() to the minimum allowed order when splitting a LBS folio. This causes confusion for some split_huge_page*() callers like memory failure handling code, since they expect after-split folios all have order-0 when split succeeds but in reality get min_order_for_split() order folios and give warnings. Fix it by failing a split if the folio cannot be split to the target order. Rename try_folio_split() to try_folio_split_to_order() to reflect the added new_order parameter. Remove its unused list parameter. [The test poisons LBS folios, which cannot be split to order-0 folios, and also tries to poison all memory. The non split LBS folios take more memory than the test anticipated, leading to OOM. The patch fixed the kernel warning and the test needs some change to avoid OOM.] Link: https://lkml.kernel.org/r/[email protected] Fixes:e220917fa5("mm: split a folio in minimum folio order chunks") Signed-off-by: Zi Yan <[email protected]> Reported-by: [email protected] Closes: https://lore.kernel.org/all/[email protected]/ Reviewed-by: Luis Chamberlain <[email protected]> Reviewed-by: Pankaj Raghav <[email protected]> Reviewed-by: Wei Yang <[email protected]> Acked-by: David Hildenbrand <[email protected]> Reviewed-by: Lorenzo Stoakes <[email protected]> Reviewed-by: Miaohe Lin <[email protected]> Cc: Baolin Wang <[email protected]> Cc: Barry Song <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: Dev Jain <[email protected]> Cc: Jane Chu <[email protected]> Cc: Lance Yang <[email protected]> Cc: Liam Howlett <[email protected]> Cc: Mariano Pache <[email protected]> Cc: Matthew Wilcox (Oracle) <[email protected]> Cc: Naoya Horiguchi <[email protected]> Cc: Ryan Roberts <[email protected]> Cc: Christian Brauner <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]>