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i0SjBwBqG6fHV7IsmO4JA9CDytKbvcFCbcUZXZQlZSE3Ex+HAmRgnbgG0cVmuk0jYPJ6b2YuxP/Qd6xmyDAOAfCUKMH+PFDcfB2neqVJNieZIFiudU7WolVm0zmAI52O+k7Ev7Yh8qLAkunIi5WIeEk1NIInNoOlmifpsJy68o2xSi18IdwBLyOV0yIYaMQXMIgBUzR2xcu0Tqy/A5gDc70H++A8yX7pJNKNiZWRHJudeFT/6bWXvRVX7fgyjbQI3byha4IlaAtsibMKxrMroUecHwzDCT2+Mzx+D6JBSwrnFH+WHTPyfAIclsMbthayEr90ridDC3AQA2z140BEmq4uiDUt0eTNnbC0BhhwTyqPHWltMdBEanJ9bRhLilbhUhJROgkTqDiJV54E= 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: --af546dc83fec9019c7e7b57f9bd41bf174c52a17d3058ccb45ac78148542 Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 On Thu Jul 4, 2024 at 7:23 AM EDT, Pankaj Raghav (Samsung) wrote: > From: Luis Chamberlain > > split_folio() and split_folio_to_list() assume order 0, to support > minorder for non-anonymous folios, we must expand these to check the > folio mapping order and use that. > > Set new_order to be at least minimum folio order if it is set in > split_huge_page_to_list() so that we can maintain minimum folio order > requirement in the page cache. > > Update the debugfs write files used for testing to ensure the order > is respected as well. We simply enforce the min order when a file > mapping is used. > > Signed-off-by: Luis Chamberlain > Signed-off-by: Pankaj Raghav > Reviewed-by: Hannes Reinecke > --- > include/linux/huge_mm.h | 14 ++++++++--- > mm/huge_memory.c | 55 ++++++++++++++++++++++++++++++++++++++--- > 2 files changed, 61 insertions(+), 8 deletions(-) > > @@ -3265,6 +3277,21 @@ int split_huge_page_to_list_to_order(struct page *= page, struct list_head *list, > return ret; > } > =20 > +int split_folio_to_list(struct folio *folio, struct list_head *list) > +{ > + unsigned int min_order =3D 0; > + > + if (!folio_test_anon(folio)) { > + if (!folio->mapping && folio_test_pmd_mappable(folio)) { > + count_vm_event(THP_SPLIT_PAGE_FAILED); > + return -EBUSY; > + } This should be if (!folio->mapping) { if (folio_test_pmd_mappable(folio)) count_vm_event(THP_SPLIT_PAGE_FAILED); return -EBUSY; } Otherwise, a non PMD mappable folio with no mapping will fall through and cause NULL pointer dereference in mapping_min_folio_order(). > + min_order =3D mapping_min_folio_order(folio->mapping); > + } > + > + return split_huge_page_to_list_to_order(&folio->page, list, min_order); > +} > + > void __folio_undo_large_rmappable(struct folio *folio) > { > struct deferred_split *ds_queue; --=20 Best Regards, Yan, Zi --af546dc83fec9019c7e7b57f9bd41bf174c52a17d3058ccb45ac78148542 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQJDBAABCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmaL70EPHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhUXcMP/iccsjWcIvFQ9jDlM8/d+4avm3j5WJ6niHNw 4FgZnZk4/UOc92X4CMDrbuarZduoppsaSUulm+yp4CvL9s8i7bRct2mW74Uhyaws XE0hcwIfYa/zcxMHFAvePBVhto9gi1BsZwpcQ/baob+T8a6WYs6d44kl9Gq60Dgd XqNZ1z0EKbOw10x8o+/vQwu0MOtQRaNHsld2qBP+Y41HvM0x6oC5asDrCqxTmdbr EUvp8tB4zVrDGt2m1dq/73aUpFIysvsGTE2nArAHEDYgY/KklQUMSSBRZlq5ne5M 0COAVMVIT/EEljf4AQLf4C4/I6//Sc9vAlryU53iEoMLllKDTq/43KHoUp/HVrLf rOXp7UcW9KnIAF5+lkhUtu+U+Vv+/3+FfyBUwvoy7UvFtdAmk0w8i851Tz+9SedX qPHmF8D+sA1/NnUqVIPAL30607rjt/MSMkyeX6XjwmHAFQpr/owzd7enYTLyojDF V2UTTzf38BDd/YebEbk8zxSTVkuIwx/iMxj7LYIiPndiwuNuL/k0xUvhAWdwnzkD QkEjV4oY2o4PSjHmpZcLKOYqWOMgQdgGUnc5e51tXp+76NW0jeDPXDilaHwmslre cOYUgDsIvVmVVhwOrQLdpM+lJaHYJEGqKAsssipZCFugwnVNyl2uo4NWTfiB12bL pv7L1SkB =Gq8t -----END PGP SIGNATURE----- --af546dc83fec9019c7e7b57f9bd41bf174c52a17d3058ccb45ac78148542--