tree:   https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dev.2022.11.04a
head:   b05c2a06ff8a1267b7e8dc812e3944119535d6b6
commit: 106377914985d3f08fc573824fd3ed56076cf331 [37/39] refscale: Add tests using SLAB_TYPESAFE_BY_RCU
config: arm-buildonly-randconfig-r002-20221108
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 463da45892e2d2a262277b91b96f5f8c05dc25d0)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/ammarfaizi2/linux-block/commit/106377914985d3f08fc573824fd3ed56076cf331
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/dev.2022.11.04a
        git checkout 106377914985d3f08fc573824fd3ed56076cf331
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash kernel/rcu/

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

All warnings (new ones prefixed by >>):

>> kernel/rcu/refscale.c:649:27: warning: no previous prototype for function 'typesafe_alloc_one' [-Wmissing-prototypes]
   struct refscale_typesafe *typesafe_alloc_one(void)
                             ^
   kernel/rcu/refscale.c:649:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct refscale_typesafe *typesafe_alloc_one(void)
   ^
   static 
   1 warning generated.


vim +/typesafe_alloc_one +649 kernel/rcu/refscale.c

   647	
   648	// Allocate and initialize one refscale_typesafe structure.
 > 649	struct refscale_typesafe *typesafe_alloc_one(void)
   650	{
   651		struct refscale_typesafe *rtsp;
   652	
   653		rtsp = kmem_cache_alloc(typesafe_kmem_cachep, GFP_KERNEL);
   654		if (!rtsp)
   655			return NULL;
   656		atomic_set(&rtsp->rts_refctr, 1);
   657		WRITE_ONCE(rtsp->a, rtsp->a + 1);
   658		WRITE_ONCE(rtsp->b, rtsp->a * rtsp->a);
   659		return rtsp;
   660	}
   661	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp