drivers/irqchip/irq-loongson-eiointc.c:289:20: warning: no previous prototype for 'acpi_get_vec_parent'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   c1dbe9a1c86da098a29dcdca1a67b65e2de7ec3a
commit: dd281e1a1a937ee2f13bd0db5be78e5f5b811ca7 irqchip: Add Loongson Extended I/O interrupt controller support
date:   2 weeks ago
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20220803/202208030600.u3ehRjUE-lkp@xxxxxxxxx/config)
compiler: loongarch64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dd281e1a1a937ee2f13bd0db5be78e5f5b811ca7
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout dd281e1a1a937ee2f13bd0db5be78e5f5b811ca7
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash drivers/irqchip/ drivers/platform/surface/aggregator/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> drivers/irqchip/irq-loongson-eiointc.c:289:20: warning: no previous prototype for 'acpi_get_vec_parent' [-Wmissing-prototypes]
     289 | struct irq_domain *acpi_get_vec_parent(int node, struct acpi_vector_group *vec_group)
         |                    ^~~~~~~~~~~~~~~~~~~


vim +/acpi_get_vec_parent +289 drivers/irqchip/irq-loongson-eiointc.c

   288	
 > 289	struct irq_domain *acpi_get_vec_parent(int node, struct acpi_vector_group *vec_group)
   290	{
   291		int i;
   292	
   293		for (i = 0; i < MAX_IO_PICS; i++) {
   294			if (node == vec_group[i].node)
   295				return vec_group[i].parent;
   296		}
   297		return NULL;
   298	}
   299	

-- 
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