Re: [PATCH v3 1/1] mm/migrate: Add migrate_device_pfns

[Andrew Morton]

On Wed, 23 Oct 2024 16:39:43 -0700 Matthew Brost <matthew.brost@xxxxxxxxx> wrote:

> Part of series [1]. Sending as individual patch ahead of that series as
> this is a prerequisite for merging.

That's news to me - singleton patches are perfectly OK?

On Wed, 23 Oct 2024 16:39:44 -0700 Matthew Brost <matthew.brost@xxxxxxxxx> wrote:

> Implement migrate_device_pfns to prepare an array of PFNs for migration.
> Handles non-contiguous ranges of device pages that require migration.

OK, that's "what".  We're more interested in "why".

> +EXPORT_SYMBOL(migrate_device_pfns);

And it's exported to modules, which adds to the significance.

Please fully describe the reasons for proposing this change.