Impact: cleanup
This warning:
 kernel/rcuclassic.c: In function ‘rcu_start_batch’:
 kernel/rcuclassic.c:397: warning: passing argument 1 of ‘cpumask_andnot’ from incompatible pointer type
triggers because one usage site of rcp->cpumask was not converted
to to_cpumask(rcp->cpumask). There's no ill effects of this bug.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
                 * unnecessarily.
                 */
                smp_mb();
-               cpumask_andnot(&rcp->cpumask, cpu_online_mask, nohz_cpu_mask);
+               cpumask_andnot(to_cpumask(rcp->cpumask),
+                              cpu_online_mask, nohz_cpu_mask);
 
                rcp->signaled = 0;
        }