[PATCH v2] mm/Kconfig: make MEMORY_FAILURE select MIGRATION

For embedded devices, lacking support for NUMA, memory hotplug/hotremove,
CMA and huge pages is a quite common scenario. In this scenario, the
demand for contiguous physical memory allocation is very low. To reduce
the kernel image size, some devices disable the compaction. However,
their SoCs do support DDR ECC, meaning that memory-failure may be needed.

Migration is very useful for soft_offline_page() in memory-failure, which
may be triggered by correctable memory errors. Most anonymous and
file-mapped faulty pages can be migrated to other healthy pages.

Currently, MEMORY_FAILURE does not explicitly select MIGRATION. When
COMPACTION, MEMORY_HOTREMOVE, NUMA_MIGRATION and CMA are all disabled,
MEMORY_FAILURE can be enabled, but MIGRATION cannot be selected.

Make MEMORY_FAILURE select MIGRATION to handle this situation.

Suggested-by: Mike Rapoport <[email protected]>
Cc: Lorenzo Stoakes (ARM) <[email protected]>
Cc: David Hildenbrand (Arm) <[email protected]>
Cc: Miaohe Lin <[email protected]>
Signed-off-by: Xie Yuanbin <[email protected]>
---
By the way, as DRAM prices continue to rise, memory-failure becomes
more important, and we are trying to enable this feature on more devices.

V1->V2: https://lore.kernel.org/[email protected]
        Do not expose the MIGRATION config to users.

 mm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index 8a24c130d008..604c58199acb 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -767,6 +767,7 @@ config MEMORY_FAILURE
 	depends on ARCH_SUPPORTS_MEMORY_FAILURE
 	bool "Enable recovery from hardware memory errors"
 	select INTERVAL_TREE
+	select MIGRATION
 	help
 	  Enables code to recover from some memory failures on systems
 	  with MCA recovery. This allows a system to continue running
-- 
2.55.0