K 10
svn:author
V 7
attilio
K 8
svn:date
V 27
2012-12-27T12:36:58.150830Z
K 7
svn:log
V 346
br_prod_tail and br_cons_tail members are used as barrier to
signal bug_ring ownership. However, instructions can be reordered
around members write leading to stale values for ie. br_prod_bufs.

Use correct memory barriers to ensure proper ordering of the
ownership tokens updates.

Sponsored by:	EMC / Isilon storage division
MFC after:	2 weeks

END