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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Kevin Brodsky , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v8 2/4] kselftest: mm: replace usage of /proc/self/smaps for __check_pmd_huge() Date: Tue, 29 Sep 2026 11:20:31 -0400 X-Mailer: MailMate (3.0r7032) Message-ID: <45251B39-898B-4628-9EDF-4346D91399F2@nvidia.com> In-Reply-To: <20260924-fix_split-v8-2-cba7359d882a@arm.com> References: <20260924-fix_split-v8-0-cba7359d882a@arm.com> <20260924-fix_split-v8-2-cba7359d882a@arm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-MS-Reactions: disallow X-ClientProxiedBy: CH0PR04CA0108.namprd04.prod.outlook.com (2603:10b6:610:75::23) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|IA1PR12MB6113:EE_ X-MS-Office365-Filtering-Correlation-Id: 739d2a42-7a2a-4320-ed45-08df1e3d353f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|23010399003|7416014|1800799024|6133799003|10067099003|56012099006|11063799006|4143699003|22082099003|18002099003; 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Furthermore, a subsequent > madvise(MADV_HUGEPAGE) call does not split the VMA because the flag is > already set. > > This causes split_huge_page_test to fail because the check_pmd_huge() > helpers incorrectly require the address returned by memalign() to > match the VMA start address reported in /proc/self/smaps. > > Instead of relying on /proc/self/smaps, use /proc/self/pagemap and > /proc/kpageflags to detect huge-page mappings checking PAGE_IS_HUGE > and PAGE_IS_FILE accroding to type of huge page. > > Since shmem pages are also file-backed, simply check whether the page > is file-backed. > > Fixes: 642bc52aed9 ("selftests: vm: bring common functions to a new file") > Suggested-by: David Hildenbrand (Arm) > Signed-off-by: Yeoreum Yun > --- > tools/testing/selftests/mm/vm_util.c | 78 ++++++++++++++++++++++-------------- > 1 file changed, 49 insertions(+), 29 deletions(-) > LGTM. Acked-by: Zi Yan Best Regards, Yan, Zi