Re: [PATCH v4 3/6] mm/notifier: add migration invalidation type

[Jason Gunthorpe]

On Thu, Jul 23, 2020 at 03:30:01PM -0700, Ralph Campbell wrote:
>  static inline int mm_has_notifiers(struct mm_struct *mm)
> @@ -513,6 +519,7 @@ static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
>  	range->start = start;
>  	range->end = end;
>  	range->flags = flags;
> +	range->migrate_pgmap_owner = NULL;
>  }

Since this function is commonly called and nobody should read
migrate_pgmap_owner unless MMU_NOTIFY_MIGRATE is set as the event,
this assignment can be dropped.

Jason