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I checked the inputs= from >> debugfs and also inside split_huge_page_to_list_to_order(). >> >> diff --git a/mm/huge_memory.c b/mm/huge_memory.c >> index a81a09236c16..4d21e57a7d07 100644 >> --- a/mm/huge_memory.c >> +++ b/mm/huge_memory.c >> @@ -3052,6 +3052,9 @@ int split_huge_page_to_list_to_order(struct page= *page, struct list_head *list, >> VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio); >> VM_BUG_ON_FOLIO(!folio_test_large(folio), folio); >> >> + if (new_order >=3D folio_order(folio)) >> + return -EINVAL; >> + >> /* Cannot split anonymous THP to order-1 */ >> if (new_order =3D=3D 1 && folio_test_anon(folio)) { >> VM_WARN_ONCE(1, "Cannot split to order-1 folio"); > > From a static analysis perspective I think just this is sufficient? Bu= t > I don't really know the code and don't object to the other parts of > this path either. You are right. The other two changes are in debugfs to avoid unnecessary folio locking operations. They are more like an optimization. -- Best Regards, Yan, Zi --=_MailMate_93C2A5D4-6736-4FBD-91FB-A8AE9D76EEC4_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmXp0g0PHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhUSwsP/2PJQulrdPevZQLcj6+lnddp/2gyNkBj0YKy ijDOMQZ6AsuT6O5n2XLG76bNUiBfkn8K/M/8kqAs6ZToHFkcJ/kdHrvz9LL5plaa KpxAHuMRwsYAoY0vnOb17b7NamszD957tL11ldGZib/OOV/3tVUr7zPjsIPOAWia KE12UIgcrgSyci3WsoXKZh0kIwFxffBKLocxQDrKcEChHn8xpzUzln+0P4X6wGqB KH7b16swqUpJSa0/E6SjYl5XDPqEtFDcMQfN/uu2w+2/y8LSO9Tg5dhwXu+EFZzp E3sxeYFzrqkw+TtbKm6JFVX9+LFw8OGQUxH9d5knaUUMMsuYySEqpdMq+zrRgD6+ +TZUR+eI92lx/IDR5++HwzqilIVEMpPJ6qV2qogmvBagToPHFpETC9ApcDlDwCk4 qvbAqatT5PqL3ldDVxL3cpe802fQw3+oxQfUzqTSHuVSpMEQkI/XhKu4kw5SxVEO Xn8rO1uqqe6b1UJCXxiAiKs3o+029Xdox8SRjXjpwEp0E49GxLLxx2jCECRHicj7 2dwo8tjDoi4ubkHyxbcb0A2S7gQHaJgrbrMF3YoUonsBlWbkD2Ao3gdDVOvrzkCW qPwhBgWIXDVYmBUqETqE9zoQuHhKw0wdMGUrV2EvEyUALeYjcYXCpRCaqtabT55P o94HWWR5 =OS/8 -----END PGP SIGNATURE----- --=_MailMate_93C2A5D4-6736-4FBD-91FB-A8AE9D76EEC4_=--