The old code was totally hosed for SMP, the windowing makes this
stuff tricky so it may need more work

(Matthew Wilcox)

(These changes are big because they are the result of Martin Hunold
resolving a *huge* long term fork in the DVB code base). We now have
one DVB codebase so the changes while big are very good news

(Again all DVB is Martin Hunold)

(Martin Hunold)

(Robert Hentosh & me)

(Stephan Maciej)

(compatmac cleanup is all Adrian Bunk)

(Bob Miller)

(Osamu Tomita)

Fixes unknown symbol copy_.. in some builds

(Miles Bader)

(Dave Jones)

(Steve Cole and co)

(Andi Kleen)

(Steven Cole)

that we for the initial value ctually want to check only
wrap-around in an "unsigned int". 

I want to make blk_init_queue() zero the queue, so we don't get anymore
nasty bugs with uninitialized variables. IDE is setting queuedata before
init though.

The single missing bit, please add that as well. Was missed because this
driver actually used elv_queue_empty, not blk_queue_empty.