[rcu:rcu/next 116/116] kernel/cpu.c:1833: warning: unused variable 'cpu'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
head:   faeb334286b762ba6b829ad62e3d39a97674bb56
commit: faeb334286b762ba6b829ad62e3d39a97674bb56 [116/116] rcu: Migrate callbacks earlier in the CPU-offline timeline
config: x86_64-randconfig-b0-06210849 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        git checkout faeb334286b762ba6b829ad62e3d39a97674bb56
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   kernel/cpu.c: In function 'boot_cpu_state_init':
>> kernel/cpu.c:1833: warning: unused variable 'cpu'

vim +/cpu +1833 kernel/cpu.c

  1817		/* Mark the boot cpu "present", "online" etc for SMP and UP case */
  1818		set_cpu_online(cpu, true);
  1819		set_cpu_active(cpu, true);
  1820		set_cpu_present(cpu, true);
  1821		set_cpu_possible(cpu, true);
  1822	
  1823	#ifdef CONFIG_SMP
  1824		__boot_cpu_id = cpu;
  1825	#endif
  1826	}
  1827	
  1828	/*
  1829	 * Must be called _AFTER_ setting up the per_cpu areas
  1830	 */
  1831	void __init boot_cpu_state_init(void)
  1832	{
> 1833		int cpu;
  1834	
  1835		per_cpu_ptr(&cpuhp_state, smp_processor_id())->state = CPUHP_ONLINE;
  1836	#ifdef CONFIG_SMP
  1837		for_each_possible_cpu(cpu)
  1838			per_cpu_ptr(&cpuhp_state, cpu)->cpu = cpu;
  1839	#endif
  1840	}

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