linux-kernel - Re: [PATCH v3 1/1] mm/migrate: Add migrate_device

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Message-Id: <20241023182217.147ee87197b53d47057a4c06@linux-foundation.org>
Date: Wed, 23 Oct 2024 18:22:17 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Matthew Brost <matthew.brost@...el.com>
Cc: intel-xe@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, simona.vetter@...ll.ch,
 felix.kuehling@....com, apopple@...dia.com
Subject: Re: [PATCH v3 1/1] mm/migrate: Add migrate_device_pfns

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