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Only ~3,000? Not really that surprising, is it? I think a more interesting metric is how many TODOs have been resolved/removed in that time. I have no interest in figuring out how to figure that out though, so...

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Couldn't you take an older kernel and do a comparison of the TODOs in the most recent, and get a count like that?

That would tell you how many of the TODOs from that specific older kernel have been fixed. But in the intervening releases you could have TODOs come and go. To find them all you would have to go through pretty much every kernel patch looking for something approximating the following regex (assuming you were looking at TODO comments and not +/- TODO files):

^-(?!--).*TODO

This should show you all lines removed from source that contain TODO, which should get you in the ballpark.

maybe make a TODO to do it

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