K 10
svn:author
V 7
attilio
K 8
svn:date
V 27
2011-04-08T18:48:57.807144Z
K 7
svn:log
V 584
Reintroduce the fix already discussed in r216805 (please check its history
for a detailed explanation of the problems).

The only difference with the previous fix is in Solution2:
CPUBLOCK is no longer set when exiting from callout_reset_*() functions,
which avoid the deadlock (leading to r217161).
There is no need to CPUBLOCK there because the running-and-migrating
assumption is strong enough to avoid problems there.
Furthermore add a better !SMP compliancy (leading to shrinked code and
structures) and facility macros/functions.

Tested by:	gianni, pho, dim
MFC after:	3 weeks

END