interrupt storm on current andy-tracking

[Andy Green]

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Somebody in the thread at some point said:
| Hello,
|
| current andy-tracking (c59a8bdc7ca4b5470ebc43dfc31ed1d3d23a7c6f) seems
| to cause an interrupt storm for input2/3. Such that the system gets dead
| slow and the syslog filled with input event debugs.
|
| 9402b27b2a497f8eeb72f6fe1045f2c5be800fe2 works fine.
|
| Any idea?

I guess it can be to do with the level interrupt processing change from
Balaji, or the GPIO fixes from Werner between those two?  Or maybe it is
config changes from me if this is that dumb input event debugging thing
come back again.

Can you show what the system input event things look like?  I don't
think we need an "interrupt storm" to explain the system being slow if
in fact we're spewing 200 input event debugs a second to syslog.

- -Andy
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