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

[Lorenzo Stoakes (ARM)]

On Thu, Aug 13, 2026 at 09:49:16PM +0800, Xie Yuanbin wrote:
> 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 <rppt@xxxxxxxxxx>
> Cc: Lorenzo Stoakes (ARM) <ljs@xxxxxxxxxx>
> Cc: David Hildenbrand (Arm) <david@xxxxxxxxxx>
> Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
> Signed-off-by: Xie Yuanbin <xieyuanbin1@xxxxxxxxxx>

LGTM so:

Reviewed-by: Lorenzo Stoakes (ARM) <ljs@xxxxxxxxxx>

> ---
> 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/20260812091644.224299-1-xieyuanbin1@xxxxxxxxxx
>         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
>

--
Cheers, Lorenzo