Re: [PATCH v14 01/12] mm/Kconfig: changes for migrate on fault for device pages

[Balbir Singh]

On 9/22/26 3:34 PM, mpenttil@xxxxxxxxxx wrote:
> 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.Howlett@xxxxxxxxxx>
> 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>
> ---
>  mm/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 604c58199acb..b7a485beb9a7 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -687,6 +687,7 @@ config MIGRATION
>  
>  config DEVICE_MIGRATION
>  	def_bool MIGRATION && ZONE_DEVICE
> +	select HMM_MIRROR
>  
>  config ARCH_ENABLE_HUGEPAGE_MIGRATION
>  	bool


Acked-by: Balbir Singh <balbirs@xxxxxxxxxx>