  An inclusive search for same-sign top-quark pair production in pp collisions
at sqrt(s) = 7 TeV is performed using a data sample recorded with the CMS
detector in 2010, corresponding to an integrated luminosity of 35 inverse
picobarns. This analysis is motivated by recent studies of p p-bar to t t-bar
reporting mass-dependent forward-backward asymmetries larger than expected from
the standard model. These asymmetries could be due to Flavor Changing Neutral
Currents (FCNC) in the top sector induced by t-channel exchange of a massive
neutral vector boson (Z'). Models with such a Z' also predict enhancement of
same-sign top-pair production in pp or p p-bar collisions. Limits are set as a
function of the Z' mass and its couplings to u and t quarks. These limits
disfavour the FCNC interpretation of the Tevatron results.
