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Subject: Re: [PATCH v5 12/12] mm/mmzone: remove zonelist_node_idx() Cc: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , To: "Gregory Price (Meta)" , X-Mailer: aerc 0.22.0 References: <20261101021340.2251928-1-gourry@gourry.net> <20261101021340.2251928-13-gourry@gourry.net> In-Reply-To: <20261101021340.2251928-13-gourry@gourry.net> X-ClientProxiedBy: YQ1P288CA0024.CANP288.PROD.OUTLOOK.COM (2603:10b6:c01:9e::7) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) X-Archived-By: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|DM6PR12MB4091:EE_ X-MS-Office365-Filtering-Correlation-Id: 677dfba0-e73a-49c1-2497-08df3958ca34 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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 uQUSyMgF 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Sat Oct 31, 2026 at 10:13 PM EDT, Gregory Price (Meta) wrote: > zonelist_node_idx() looks like it returns a field of the zoneref, as > zonelist_zone_idx() does, but it loads the zone from the slot again. > > Memory hotplug rewrites zonelists in place, so a caller that has already > checked the slot can get a different zone, or the NULL terminator, from > that second load. > > __next_zones_zonelist() and mempolicy_slab_node() had this bug. > > Remove the helper and open-code it in its two remaining callers, neither > of which can race with a rebuild. local_memory_node() runs either inside > __build_all_zonelists() or during CPU bring-up, which holds > cpu_hotplug_lock for write and so excludes mem_hotplug_begin(). > > The lookup in mpol_misplaced() is unreachable: it needs a policy with > MPOL_F_MOF but not MPOL_F_MORON, and nothing sets one without the other. > > Signed-off-by: Gregory Price (Meta) > --- > include/linux/mmzone.h | 6 ------ > mm/mempolicy.c | 2 +- > mm/page_alloc.c | 2 +- > 3 files changed, 2 insertions(+), 8 deletions(-) > LGTM. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi