[PATCH v7 1/6] mm:/Kconfig changes for migrate on fault for device pages

mpenttil
2026-03-30T04:30:45Z

With the unified HMM/migrate_device page table walk
migrate_device needs HMM enabled and HMM needs
MMU notifiers. Enable them explicitly to avoid
breaking random configs.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Mika Penttilä <mpenttil@redhat.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
---
mm/Kconfig | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index ebd8ea353687..583d92bba2e8 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -647,6 +647,7 @@ config MIGRATION

config DEVICE_MIGRATION
def_bool MIGRATION && ZONE_DEVICE
+ select HMM_MIRROR

config ARCH_ENABLE_HUGEPAGE_MIGRATION
bool
@@ -1222,6 +1223,7 @@ config ZONE_DEVICE
config HMM_MIRROR
bool
depends on MMU
+ select MMU_NOTIFIER

config GET_FREE_REGION
bool
--
2.50.0