PR9947: move runtime cleanup out of the work queue

The kernel lockdep checking found a possible deadlock if a forced rmmod
tried to destroy _stp_work_queue at the same time that the work queue
was unregistering tracepoints.  An unlikely scenario, but still
possible.

Now the work queue will just issue a STP_REQUEST_EXIT down to usermode,
and usermode will echo back an STP_EXIT that triggers the actual probe
cleanup.  This way the unregistrations are happening in exactly the same
context as the registrations were.

0 files changed, 0 insertions, 0 deletions