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Shutemov\"" , Ryan Roberts , linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] mm/huge_memory: check new folio order when split a folio Date: Thu, 07 Mar 2024 15:09:40 -0500 X-Mailer: MailMate (1.14r6018) Message-ID: <90B3461F-3A95-46F9-92F5-EA222A65D739@nvidia.com> In-Reply-To: <20240307120224.0e627784a13cff1121048ae4@linux-foundation.org> References: <20240307181854.138928-1-zi.yan@sent.com> <20240307120224.0e627784a13cff1121048ae4@linux-foundation.org> Content-Type: multipart/signed; boundary="=_MailMate_2A49FE18-2452-44CF-9610-9E13B2CC0FC6_="; micalg=pgp-sha512; protocol="application/pgp-signature" X-ClientProxiedBy: BLAPR05CA0036.namprd05.prod.outlook.com (2603:10b6:208:335::17) To DS7PR12MB5744.namprd12.prod.outlook.com (2603:10b6:8:73::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB5744:EE_|CH3PR12MB8904:EE_ X-MS-Office365-Filtering-Correlation-Id: 760da89b-3ee9-4529-c1c0-08dc3ee286a6 X-MS-Exchange-SenderADCheck: 1 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U2FsdGVkX18ppsq803cOcTX5fwcJjZCOy0Muk3HyMi/P75kfdgdvDSJvcDrKjdILDjYCblYG6g6VQ++29d94wxgnjpPUxZdWaLjfpgoTjnjwATsde6fG31sy6sGIrf1nA4MkHA0Z/1cWuc3+GZnAo0rQfTcYRJojr0OwCofqwgUk3fn1mK2nP20p5Wmu6hJJJTnLqqo/Fm482uffMT2sr0DRhU2J9H5z20ilWDN3WCfiCKI62m6LQyLcZKr988ep6CcadfMDNkzk9oLStp0fdMFzyJpl+kGlo0l917Ufe/hH5anNeNmIcq6ZOKYQ+3lz+h5P7+v931BQa9REH97+J0G2qAXmuT12TI0X++Mnr8IUzL8yyMZ9HAAVsBGQ4XXFonNcefkXBrYovDIaE58deORxPdk2H0y7Llwm+3/dLq2QkyT+4NsiMxu9hl9Xj4bPsoHDi2EbsGzXHb5nmrzng2Gww+L0f0+zZ6rkTKlaREhorO1Yay/Pobx3BHmgwrld4rO2xv6xTwxox7F+krnbNF53NG9eQH65u0K/1Op7LJTqGUKPBgZA+gjqx7DKFHrGbfmXmkoR8GtDuXyYweBkp0tYLzxlxr9VyaS5bk0bSjK+5Ko6GuOCzBOYa77yof1j34xcjo2TOqvuaXkeBi3GRl/vfpIcJxSJ75td+wxTyfbFbmA1tTIK3ujefLAzzzGisjI05/chffn5Ue/f2ftQ6v1eXlphWi6OjBdsAJFWbjHXlvr3lV7CVTKQ0pdLwguBuIbRf7P81Q/bJa7bh5oQcoM1S9v9Kokw0Mm6jnpGIkBdmZBLAGfBnLrSDQAROsbyFfM4hCszJiWxj6fsIEDNkHWRpglH6SKXdrXqbz0sVti1EeF6cdowxQJu6+TwI5c+aky9GSrxWe6v9yAUZVL482bpsLPPd+wIIxuzcUV55XtbHtyfqR8QDFACaki1UYn7hKpK4DYxWKtbUV48JIL 4sfUbp6i 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Check new_order to make sure >> it is smaller than input folio order. > > It isn't clear what's being fixed here. Presumably something is > passing in such folios, but what and where and why and what are the > effects? > > Might it be that these folios are being caused by the debugfs > interface? Or something else? Since there is no new_order checks in debugfs before, any new_order can be passed via debugfs into split_huge_page_to_list_to_order(). I did not explicitly mention it here as the debugfs is added in the commit after the Fixes one. > > So I'll add it, but I do think more information and context would > improve the patch, please. Suitable Reported-by:, Closes: and Link: > tags, perhaps. -- Best Regards, Yan, Zi --=_MailMate_2A49FE18-2452-44CF-9610-9E13B2CC0FC6_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmXqHwQPHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhU4rEP/iTi+57j+NZ6c3icFzIHW9gCDjPDozkdMN9A hbFAhClLyGpvR8Trehkrlc7tygT0OEvRyAIU+qhvWeW1fcGkloobuUhD50jUarA6 U11MTQd7smQ3CKn02WhowXq3EfpXSkZ/n6o3TgmJCAKTGnE8p+DMd8RXa7R9s9Kr lauMo2vIz8ejbkrt+VNQJxfO7LqT+y+1Nt6dekNUC5ZKQ0BpKHBuZglrBQoEVXRe znqCy4CyVb3Sb3Pc8d4SHKnm/wy7JJqSVCLT6emf8R06kPSOzQEo9AyxQL9aRTSk UBsttd7BUzgxXv2N1j4LBz5y7l2W9I0JAZz2xXgNHskI0Sw/EQ3q/NhAZBnAjo/7 oy2fbRNYVuCH3fLxsaJuBLPDkApvmgZCh+tyh7ht5nLc+n1Ay0ZSm24HU8hOAEWo i1B9ZEAAKbf7/UXMBxleEmwR51DgCnpK0QW6ns+JuBjUX4o15H09BjJuBDrNBZWq TyR5M4M60DCgMD54snWkYVaxK8conHh6srMX55gXcxtO5UiiWaAGp2cSouRC+DGO C5p8FDA+sT2oqULHDkiiOBvxw4Q5mQF2Dl4RuG8kyAYk/BThIsAEdJjHu8ye7byC PJCU8dAqlKm/SRMx19WZFOQIrPeBOuJi07QvDO5phOLm6NxAusExCxhwZ29a2anV dno7m7Xj =z91I -----END PGP SIGNATURE----- --=_MailMate_2A49FE18-2452-44CF-9610-9E13B2CC0FC6_=--