  Measurements performed by the CMS experiment of the cross section for
inclusive b-quark production in proton-proton collisions at sqrt(s) = 7 TeV are
presented. The measurements are based on different methods, such as inclusive
jet measurements with secondary vertex tagging or selecting a sample of events
containing jets and at least one muon, where the transverse momentum of the
muon with respect to the closest jet axis discriminates b events from the
background. The results are compared with predictions based on perturbative QCD
calculations at leading and next-to-leading order.
