PPS broken in 7.1 - missing interrupt enable in com.c

I setup an amd64 7.1 system, and built a kernel with PPS_SYNC.  It gave data, 
but was off by hundreds of ms with lots of jitter.

I guessed that it was not getting an interrupt on the PPS event but was 
processing the event when it got an recv interrupt.  I hacked comopen in 
com.c to turn on IER_EMSC and things started to work sensibly.

I don't see a similar fix in current.  (But maybe I didn't look in the right 
place.)

Does anybody know if PPS works in 8 or current?

Is this the right place to ask?  If not, where?  ...


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