e969f9a780
There's no need to sit there and increment the stats when we know all the increments would be zero anyway. The actual additions might not be very expensive, but skipping acquisition of the spinlock seems like a good thing. Pushing the logic about initialization of the usage count down into entry_alloc() allows us to do that while making the code actually simpler, not more complex. Expansion on a suggestion by Peter Geoghegan.
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