Hi Tomasz,

[auto build test ERROR on v4.4-rc4]
[also build test ERROR on next-20151217]
[cannot apply to tip/irq/core v4.4-rc5]

url:    https://github.com/0day-ci/linux/commits/Tomasz-Nowicki/Introduce-ACPI-world-to-GICv3-ITS-irqchip/20151217-195910
config: arm-allyesconfig (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 >>):

   drivers/irqchip/irq-gic-v3.c: In function 'gic_irq_domain_translate':
>> drivers/irqchip/irq-gic-v3.c:768:2: error: implicit declaration of function 'is_fwnode_irqchip' [-Werror=implicit-function-declaration]
     if (is_fwnode_irqchip(fwspec->fwnode)) {
     ^
   cc1: some warnings being treated as errors

vim +/is_fwnode_irqchip +768 drivers/irqchip/irq-gic-v3.c

   762			}
   763	
   764			*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
   765			return 0;
   766		}
   767	
 > 768		if (is_fwnode_irqchip(fwspec->fwnode)) {
   769			if(fwspec->param_count != 2)
   770				return -EINVAL;
   771	

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