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[PATCH 1/2] mm: decrement MTHP_STAT_NR_ANON in free_zone_device_folio() Cc: , , "Oscar Salvador" , "Andrew Morton" , "Matthew Brost" , "Joshua Hahn" , "Rakie Kim" , "Byungchul Park" , "Gregory Price" , "Ying Huang" , "Alistair Popple" To: "Nico Pache" , "Barry Song" , "David Hildenbrand" , , , From: "Zi Yan" X-Mailer: aerc 0.21.0 References: <20260702172548.37075-1-npache@redhat.com> <20260702172548.37075-2-npache@redhat.com> In-Reply-To: <20260702172548.37075-2-npache@redhat.com> X-ClientProxiedBy: CH3P221CA0012.NAMP221.PROD.OUTLOOK.COM (2603:10b6:610:1e7::26) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|CH3PR12MB9395:EE_ X-MS-Office365-Filtering-Correlation-Id: cefc28c8-fdff-4add-67c2-08ded85fbec1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu Jul 2, 2026 at 1:25 PM EDT, Nico Pache wrote: > When a zone device folio is mapped as anonymous, folio_add_new_anon_rmap(= ) > increments MTHP_STAT_NR_ANON. The corresponding decrement lives in > __free_pages_prepare() in page_alloc.c, but zone device folios are freed > via free_zone_device_folio() which never calls __free_pages_prepare(). > This causes nr_anon to remain permanently elevated after zone device > folios are freed. > > Add the missing mod_mthp_stat() decrement to free_zone_device_folio() > so that the counter is properly balanced. > > Fixes: 5d65c8d758f2 ("mm: count the number of anonymous THPs per size") > Co-developed-by: David Hildenbrand > Signed-off-by: David Hildenbrand > Signed-off-by: Nico Pache > --- > mm/memremap.c | 1 + > 1 file changed, 1 insertion(+) > LGTM. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi