[ammarfaizi2-block:google/android/kernel/common/android12-trusty-5.10 3280/5869] drivers/hwtracing/coresight/coresight-etm4x-core.c:118:5: warning: no previous prototype for function 'ete_sysreg_read'

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android12-trusty-5.10
head:   94a36a1374e79fb3aa3539f8b99aa110fdc7b7a0
commit: 82ce4a8af88d25d3f75de6e8437de3d2f049cac3 [3280/5869] FROMLIST: coresight: ete: Add support for ETE sysreg access
config: arm64-buildonly-randconfig-r006-20220130 (https://download.01.org/0day-ci/archive/20220130/202201300813.TO5y2Xbm-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 33b45ee44b1f32ffdbc995e6fec806271b4b3ba4)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/ammarfaizi2/linux-block/commit/82ce4a8af88d25d3f75de6e8437de3d2f049cac3
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android12-trusty-5.10
        git checkout 82ce4a8af88d25d3f75de6e8437de3d2f049cac3
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/hwtracing/coresight/

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

All warnings (new ones prefixed by >>):

>> drivers/hwtracing/coresight/coresight-etm4x-core.c:118:5: warning: no previous prototype for function 'ete_sysreg_read' [-Wmissing-prototypes]
   u64 ete_sysreg_read(u32 offset, bool _relaxed, bool _64bit)
       ^
   drivers/hwtracing/coresight/coresight-etm4x-core.c:118:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   u64 ete_sysreg_read(u32 offset, bool _relaxed, bool _64bit)
   ^
   static 
>> drivers/hwtracing/coresight/coresight-etm4x-core.c:135:6: warning: no previous prototype for function 'ete_sysreg_write' [-Wmissing-prototypes]
   void ete_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit)
        ^
   drivers/hwtracing/coresight/coresight-etm4x-core.c:135:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void ete_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit)
   ^
   static 
   2 warnings generated.


vim +/ete_sysreg_read +118 drivers/hwtracing/coresight/coresight-etm4x-core.c

   117	
 > 118	u64 ete_sysreg_read(u32 offset, bool _relaxed, bool _64bit)
   119	{
   120		u64 res = 0;
   121	
   122		switch (offset) {
   123		ETE_READ_CASES(res)
   124		default :
   125			pr_warn_ratelimited("ete: trying to read unsupported register @%x\n",
   126					    offset);
   127		}
   128	
   129		if (!_relaxed)
   130			__iormb(res);	/* Imitate the !relaxed I/O helpers */
   131	
   132		return res;
   133	}
   134	
 > 135	void ete_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit)
   136	{
   137		if (!_relaxed)
   138			__iowmb();	/* Imitate the !relaxed I/O helpers */
   139		if (!_64bit)
   140			val &= GENMASK(31, 0);
   141	
   142		switch (offset) {
   143		ETE_WRITE_CASES(val)
   144		default :
   145			pr_warn_ratelimited("ete: trying to write to unsupported register @%x\n",
   146					    offset);
   147		}
   148	}
   149	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org