Re: [PATCH 2/2] dax: Giant hack

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>  - Switch back to calling ->page_mkwrite instead of ->pfn_mkwrite.  DAX now
>    always has a page to lock,

Can you expound on this a little?

If I understood pfn_mkwrite() it was there to enable DAX to track
writes to mmap addresses that only had a pfn and therefore no struct
page.  So where does the page come from?  Are we just skipping the pfn
case now?  What are the implications?
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