Hi Paul,

There are new compile warnings show up in

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev
head:   ee3b872037f9b7ee05573b8cb3802fcd3d632d14
commit: fbd59c99e9888c48c7f8298b0325bf4d4e063e28 [21/37] sched: Make migration_call() safe for stop_machine()-free hotplug
config: i386-randconfig-m011 (attached as .config)

All error/warnings:

kernel/sched/core.c: In function 'migration_call':
kernel/sched/core.c:5453:13: warning: unused variable 'rq_dest' [-Wunused-variable]

vim +5453 kernel/sched/core.c
  5450		int cpu = (long)hcpu;
  5451		unsigned long flags;
  5452		struct rq *rq = cpu_rq(cpu);
> 5453		struct rq *rq_dest = cpu_rq(cpumask_any(cpu_active_mask));
  5454	
  5455		switch (action & ~CPU_TASKS_FROZEN) {
  5456	

All the users are in one #ifdef CONFIG_HOTPLUG_CPU block.

---
0-DAY kernel build testing backend         Open Source Technology Centre
Fengguang Wu <wfg@linux.intel.com>                     Intel Corporation