strange bug rmap15a

[Rik van Riel <riel@conectiva.com.br>]

OK, something between rmap15 and rmap15a is triggering the
following bug, where launder_page() really doesn't know
what to do with a page that:
1) has a page->count of 1
2) does not have mapping, buffers, or pte_chain set
3) is clean

mystery page c1028220, cnt 1 map 00000000, buf 00000000, ptec 00000000, dirty 0

I don't know how the pages end up in this situation, but it's
not a pretty sight and effectively kills the machine...

Rik
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