Hi Daniel,

[auto build test ERROR on v4.4-rc5]
[also build test ERROR on next-20151218]
[cannot apply to tip/irq/core]

url:    https://github.com/0day-ci/linux/commits/Daniel-Thompson/irq-arm-Use-FIQ-for-NMI-backtrace-when-possible/20151221-045854
config: arm-iop-adma (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   arch/arm/kernel/traps.c: In function 'handle_fiq_as_nmi':
>> arch/arm/kernel/traps.c:489:2: error: implicit declaration of function 'handle_arch_irq' [-Werror=implicit-function-declaration]
     handle_arch_irq(regs);
     ^
   cc1: some warnings being treated as errors

vim +/handle_arch_irq +489 arch/arm/kernel/traps.c

   483		 * Either the interrupt controller supports FIQ, meaning it will
   484		 * do the right thing with this call, or we will end up treating a
   485		 * spurious FIQ (which is normally fatal) as though it were an IRQ
   486		 * which, although it risks deadlock, still gives us a sporting
   487		 * chance of surviving long enough to log errors.
   488		 */
 > 489		handle_arch_irq(regs);
   490	
   491		nmi_exit();
   492	

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