[PATCH v17 01/12] mm/Kconfig: changes for migrate on fault for device pages

[mpenttil]

From: Mika Penttilä <mpenttil@xxxxxxxxxx>

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

Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Lorenzo Stoakes <ljs@xxxxxxxxxx>
Cc: "Liam R. Howlett" <liam@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Mika Penttilä <mpenttil@xxxxxxxxxx>
Acked-by: David Hildenbrand (Arm) <david@xxxxxxxxxx>
Acked-by: Balbir Singh <balbirs@xxxxxxxxxx>
---
 mm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index afff1b25b543..6fa03655b575 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -682,6 +682,7 @@ config MIGRATION
 
 config DEVICE_MIGRATION
 	def_bool MIGRATION && ZONE_DEVICE
+	select HMM_MIRROR
 
 config ARCH_ENABLE_HUGEPAGE_MIGRATION
 	bool
-- 
2.55.0