Mainly for portability reasons I have rebased the mutex tests on Solaris
taskqs instead of linux work queues. The linux workqueue API changed post
2.6.18 kernels and using task queues avoids having to conditionally detect
which workqueue API to use.
Additionally, this is basically free additional testing for the task queues.
Much to my surprise after updating these test cases they did expose a long
standing bug in the taskq_wait() implementation. This patch does not
address that issue but the followup patch does.
- Added SPL_AC_3ARGS_ON_EACH_CPU configure check to determine
if the older 4 argument version of on_each_cpu() should be
used or the new 3 argument version. The retry argument was
dropped in the new API which was never used anyway.
- Updated work queue compatibility wrappers. The old way this
worked was to pass a data point when initialized the workqueue.
The new API assumed the work item is embedding in a structure
and we us container_of() to find that data pointer.
- Updated skc->skc_flags to be an unsigned long which is now
type checked in the bit operations. This silences the warnings.
- Updated autogen products and splat tests accordingly
