In the "general barrier pairing with implicit control depdendency"
example, the last write by CPU 1 was meant to change variable x and not
y. The example would be pretty uninteresting if no CPU ever changes x
and the variable was initialized to zero.
Signed-off-by: NScott Tsai <scottt@scottt.tw>
Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>