user_xcpus
cpumask_and(excpus, user_xcpus(cs), parent->effective_xcpus);
cpumask_and(excpus, user_xcpus(trialcs), parent->effective_xcpus);
struct cpumask *xcpus = user_xcpus(cs);
struct cpumask *xcpus1 = user_xcpus(cs1);
struct cpumask *xcpus2 = user_xcpus(cs2);
!cpuset_cpumask_can_shrink(cur->effective_cpus, user_xcpus(trial)))