This adds dcri_clrset() macro which does read/modify/write
on indirect dcr registers while holding indirect dcr lock.
Signed-off-by: NValentine Barshak <vbarshak@ru.mvista.com>
Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>