From: Esben Nielsen <simlo at phys au dk>

One of the problems was use of direct architecture specific semaphores (which
doesn't work under PREEMPT_REALTIME) and in places where a quick (maybe too
quick) look at the code told me that completions ought to be used.  Therefore
I changed two semaphores to completions which compiled fine.  I have tried the
change on 2.6.11-rc2, and it seemed to work, but I have not tested it heavily.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>