K 10
svn:author
V 6
adrian
K 8
svn:date
V 27
2009-05-30T15:20:25.981262Z
K 7
svn:log
V 360
Even though I'm not quite sure that the call_func stuff will work properly
in all the places/cases IPI messages will be generated, at least be consistent
with how the call_data pointer is assigned and cleared (ie, all done inside
the spinlock.

Ensure that its NULL before continuing, just to try and identify situations
where things are going horribly wrong.

END