WaitQueues.

[Roland Dreier]

    Ralph> Is there anyway to contionally initialize a wait queue. I
    Ralph> want to test a wait queue to see if has been initialized
    Ralph> not initialize it.  If not, how do I serialize an access to
    Ralph> a set location so that I can atomically test and increment
    Ralph> that location?

I'm not sure about doing init_waitqueue_head() conditionally, but as
for atomic test and increment, you could use atomic_t (look at
asm/atomic.h).  That gives you atomic_inc_and_test_greater_zero()
among other things.  If you just want to set a flag,
test_and_set_bit() may be simpler.

Roland

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