[PATCH] mm, page_pool: introduce a new page type for page pool in page type

[Byungchul Park]

Hi,

I focused on converting the existing APIs accessing ->pp_magic field to
page type APIs.  However, yes.  Additional works would better be
considered on top like:

   1. Adjust how to store and retrieve dma index.  Maybe network guys
      can work better on top.

   2. Move the sanity check for page pool in mm/page_alloc.c to on free.

   Byungchul

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