powerpc_release_pmc
pcd->pcd_release_pmc = powerpc_release_pmc;
pcd->pcd_release_pmc = powerpc_release_pmc;
pcd->pcd_release_pmc = powerpc_release_pmc;
int powerpc_release_pmc(int cpu, int ri, struct pmc *pmc);
pcd->pcd_release_pmc = powerpc_release_pmc;