Re: [PATCH 1/2] thp: Add compound tail page _mapcount when mapped

[Andrea Arcangeli]

Both are needed to take care of CONFIG_DEBUG_VM false positives. Worst
case a false positive hits, but if it doesn't there was no risk because
the tail page refcounting isn't actively used by that code and the
refcounting on the head page was done right already.

Thanks,
Andrea
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