mm: factor out the numa mapping rebuilding into a new helper

Patch series "support multi-size THP numa balancing", v2.

This patchset tries to support mTHP numa balancing, as a simple solution
to start, the NUMA balancing algorithm for mTHP will follow the THP
strategy as the basic support.  Please find details in each patch.


This patch (of 2):

To support large folio's numa balancing, factor out the numa mapping
rebuilding into a new helper as a preparation.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/8bc2586bdd8dbbe6d83c09b77b360ec8fcac3736.1711683069.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <[email protected]>
Reviewed-by: "Huang, Ying" <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: John Hubbard <[email protected]>
Cc: Kefeng Wang <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Ryan Roberts <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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