em watchdogs - OS involvement

[Bruce Evans]

On Tue, 30 Oct 2007, Jack Vogel wrote:

> Another bit of data, if I define DEVICE_POLLING on the Oct. snap it
> also will work.

Defining DEVICE_POLLING (globally) breaks configuration of "fast"
interrupt handlers in em.  I have to #undef it to test "fast" interrupt
handlers in em without losing testing of polling in other network
drivers.  I lose only testing of polling in em.

Bruce