[linux-next:master 14157/14231] kernel/resource.c:505:5: warning: no previous prototype for function '__region_intersects'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   b74523885a715463203d4ccc3cf8c85952d3701a
commit: edede6a2ecfe8553e8232eb863a7a13ef40da3a2 [14157/14231] kernel/resource: allow region_intersects users to hold resource_lock
config: powerpc-randconfig-r011-20210421 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d87b9b81ccb95217181ce75515c6c68bbb408ca4)
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
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=edede6a2ecfe8553e8232eb863a7a13ef40da3a2
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout edede6a2ecfe8553e8232eb863a7a13ef40da3a2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=powerpc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All warnings (new ones prefixed by >>):

quoted

kernel/resource.c:505:5: warning: no previous prototype for function '__region_intersects' [-Wmissing-prototypes]

   int __region_intersects(resource_size_t start, size_t size, unsigned long flags,
       ^
   kernel/resource.c:505:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int __region_intersects(resource_size_t start, size_t size, unsigned long flags,
   ^
   static 
   1 warning generated.


vim +/__region_intersects +505 kernel/resource.c

   504	
 > 505	int __region_intersects(resource_size_t start, size_t size, unsigned long flags,
   506				unsigned long desc)
   507	{
   508		struct resource res;
   509		int type = 0; int other = 0;
   510		struct resource *p;
   511	
   512		res.start = start;
   513		res.end = start + size - 1;
   514	
   515		for (p = iomem_resource.child; p ; p = p->sibling) {
   516			bool is_type = (((p->flags & flags) == flags) &&
   517					((desc == IORES_DESC_NONE) ||
   518					 (desc == p->desc)));
   519	
   520			if (resource_overlaps(p, &res))
   521				is_type ? type++ : other++;
   522		}
   523	
   524		if (type == 0)
   525			return REGION_DISJOINT;
   526	
   527		if (other == 0)
   528			return REGION_INTERSECTS;
   529	
   530		return REGION_MIXED;
   531	}
   532	

---
0-DAY CI Kernel Test Service, Intel Corporation
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