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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 Mon Oct 26, 2026 at 7:17 PM EDT, David Hildenbrand (Arm) wrote: > From: Chris Mason > > A PMD migration entry can refer to a device-private folio. Right, set_pmd_migration_entry() does that when a device private folio is migrated back to system memory. > zap_huge_pmd_folio() checks the folio type instead of the entry type, > so it treats such a migration entry as a device-private entry. > > Installing the migration entry already removed the reverse mapping and > dropped the mapping reference. Zapping it must not repeat those > operations. Concurrent MADV_DONTNEED during migration back to system > memory can trigger this. > > Check the PMD entry type using pmd_is_device_private_entry(). > > Fix generated by an LLM and sent by Chris Mason in private. > > Fixes: 368076f52ebe ("mm/huge_memory: add device-private THP support to P= MD operations") > Cc: stable@vger.kernel.org > Signed-off-by: Chris Mason > [ david: simplify description ] > Signed-off-by: David Hildenbrand (Arm) > --- > mm/huge_memory.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi