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 PWeQ1mGC 2c2XqgbR69B2EyCBYYAoIlYmkFTF7EeDEs0xzFmkE7ij8JHegXw72GUqynedeyJujPF0AjzfKiy6dX5Uo6sCFV2mMbg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 11/13/25 23:07, David Hildenbrand (Red Hat) wrote: > On 13.11.25 12:56, Lorenzo Stoakes wrote: >> On Thu, Nov 13, 2025 at 04:13:52PM +1100, Balbir Singh wrote: >>> The softleaf changes exposed a BUG in remove_rmap_pmd() where the >>> migration entry was being overridden when the folio is device private. >>> >>> Use scope local entry for creating the device private pmde. Make the >>> pmde writable if the migration entry is writable by moving the check >>> softleaf_is_migration_write() prior to creating the device private entry. >>> >>> Cc: Andrew Morton >>> Cc: David Hildenbrand >>> Cc: Zi Yan >>> Cc: Joshua Hahn >>> Cc: Rakie Kim >>> Cc: Byungchul Park >>> Cc: Gregory Price >>> Cc: Ying Huang >>> Cc: Alistair Popple >>> Cc: Oscar Salvador >>> Cc: Lorenzo Stoakes >>> Cc: Baolin Wang >>> Cc: "Liam R. Howlett" >>> Cc: Nico Pache >>> Cc: Ryan Roberts >>> Cc: Dev Jain >>> Cc: Barry Song >>> Cc: Lyude Paul >>> Cc: Danilo Krummrich >>> Cc: David Airlie >>> Cc: Simona Vetter >>> Cc: Ralph Campbell >>> Cc: Mika Penttilä >>> Cc: Matthew Brost >>> Cc: Francois Dugast >>> >>> Signed-off-by: Balbir Singh >> >> THe logic LGTM but we don't want to have a bisect hazard here by having the bug >> introduced earlier then resolved here. > > Exactly. > The hazard is a VM_WARN_ON() that checks for is_migration_entry() in the call to softleaf_is_migration_young(). I am happy to go down that path, let me send out the fixups, it felt weird to break the rebase, but I am sure Andrew has a better way of dealing with this stuff. Balbir