mm/memory_hotplug: skip adjust_managed_page_count() for PageOffline() pages when offlining

We currently have a hack for virtio-mem in place to handle memory
offlining with PageOffline pages for which we already adjusted the managed
page count.

Let's enlighten memory offlining code so we can get rid of that hack, and
document the situation.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: David Hildenbrand <[email protected]>
Acked-by: Oscar Salvador <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Dexuan Cui <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Eugenio Pérez <[email protected]>
Cc: Haiyang Zhang <[email protected]>
Cc: Jason Wang <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: "K. Y. Srinivasan" <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Mike Rapoport (IBM) <[email protected]>
Cc: Oleksandr Tyshchenko <[email protected]>
Cc: Stefano Stabellini <[email protected]>
Cc: Wei Liu <[email protected]>
Cc: Xuan Zhuo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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