mm/page_ext: add common function to get client data from page_ext

Patch series "add page_ext_data to get client data in page_ext".

Current clients get data from page_ext by adding offset which is auto
generated in page_ext core and exposes the data layout design inside
page_ext core.  This series adds a page_ext_data() to hide this from
clients.  

Benefits include:

1. Future clients can call page_ext_data directly instead of defining
   a new function like get_page_owner to get the data.

2. There is no change to clients if the layout of page_ext data changes.


This patch (of 3):

Add common page_ext_data function to get client data.  This could hide
offset which is auto generated in page_ext core and expose the desgin of
page_ext data layout.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Kemeng Shi <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Acked-by: Mike Rapoport (IBM) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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