Re: unmap_range() premature exit

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[...]

> No, we get the page each time we add an entry and we put the page every
> time we clear an entry.  So if you have 512 possible entries in a PMD,
> if all of them points to a table or are block descriptors (no empty
> entries in the PMD), the count will be 512 (one for each entry, and one
> to keep the page reserved in the first place).

Sorry, if all the entries are non-empty, the count will be 513, not
512, 1 for the page allocation, and 512 for the entries.

/me goes away to confuse someone else
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