Both the SPL and the ZFS libspl export most of the atomic_* functions,
except atomic_sub_* functions which are only exported by the SPL, not by
libspl. This patch remedies that by implementing atomic_sub_* functions
in libspl.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1013
All changes needed for the libspl layer. This includes modifications
to files directly copied from OpenSolaris and the addition of new
files needed to fill in the gaps.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>