Hi Nicholas,

I love your patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on v4.17-rc3 next-20180504]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Nicholas-Piggin/powerpc-64-irq_work-avoid-interrupt-when-called-with-hardware-irqs-enabled/20180505-193051
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-kilauea_defconfig (attached as .config)
compiler: powerpc-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

Note: the linux-review/Nicholas-Piggin/powerpc-64-irq_work-avoid-interrupt-when-called-with-hardware-irqs-enabled/20180505-193051 HEAD 6f7d1654cc9b2355ec6983991f1f293089e9c762 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   arch/powerpc/kernel/time.c: In function 'timer_broadcast_interrupt':
>> arch/powerpc/kernel/time.c:646:2: error: implicit declaration of function 'tick_receive_broadcast'; did you mean 'tick_setup_hrtimer_broadcast'? [-Werror=implicit-function-declaration]
     tick_receive_broadcast();
     ^~~~~~~~~~~~~~~~~~~~~~
     tick_setup_hrtimer_broadcast
   cc1: all warnings being treated as errors

vim +646 arch/powerpc/kernel/time.c

   638	
   639	void timer_broadcast_interrupt(void)
   640	{
   641		u64 *next_tb = this_cpu_ptr(&decrementers_next_tb);
   642		struct pt_regs *regs = get_irq_regs();
   643	
   644		trace_timer_interrupt_entry(regs);
   645		*next_tb = ~(u64)0;
 > 646		tick_receive_broadcast();
   647		__this_cpu_inc(irq_stat.timer_irqs_event);
   648		trace_timer_interrupt_exit(regs);
   649	}
   650	

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