2.6.21-rc3-mm2: PG_booked and PG_readahead

[Andy Whitcroft]

[applogies in advance if this has already been asked]

I note that PG_booked and PG_readahead are both using bit 20 in
2.6.21-rc3-mm2.  Is this intentional or perhaps a miss-merge.  They do
not sound obviously non-overlapping to my mind.

-apw
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