kernel: Change ASSIGN_ONCE(val, x) to WRITE_ONCE(x, val)
kernel: Change ASSIGN_ONCE(val, x) to WRITE_ONCE(x, val)

Feedback has shown that WRITE_ONCE(x, val) is easier to use than
ASSIGN_ONCE(val,x).
There are no in-tree users yet, so lets change it for 3.19.

Signed-off-by: Christian Borntraeger <49712f635b03c16d7f4c43df70e49ec8c565813d@de.ibm.com>
Acked-by: Peter Zijlstra <3fddac958924aef220f202ca567388ddab3f14a8@infradead.org>
Acked-by: Davidlohr Bueso <bfcdf3e6ca6cef45543bfbb57509c92aec9a39fb@stgolabs.net>
Acked-by: Paul E. McKenney <1e0ce936bb9b355d257bf5790d2513c3f28be22b@linux.vnet.ibm.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs