tree:   https://github.com/intel/linux-intel-lts.git 4.19/android_r
head:   d12f442b46a8bc16c4f3f7644a56fdf4133149c3
commit: 3179a1a38d96f565a2229b9244285c6abf62b10a [15919/23449] ANDROID: GKI: clk: Add support for voltage voting
config: x86_64-randconfig-a015-20210604 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 5c0d1b2f902aa6a9cf47cc7e42c5b83bb2217cf9)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/intel/linux-intel-lts/commit/3179a1a38d96f565a2229b9244285c6abf62b10a
        git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git
        git fetch --no-tags intel-linux-intel-lts 4.19/android_r
        git checkout 3179a1a38d96f565a2229b9244285c6abf62b10a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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/clk/clk.c:624:24: warning: variable 'ignore' set but not used [-Wunused-but-set-variable]
           int level, rc = 0, i, ignore;
                                 ^
   drivers/clk/clk.c:3145:5: warning: no previous prototype for function 'clk_set_flags' [-Wmissing-prototypes]
   int clk_set_flags(struct clk *clk, unsigned long flags)
       ^
   drivers/clk/clk.c:3145:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int clk_set_flags(struct clk *clk, unsigned long flags)
   ^
   static 
   drivers/clk/clk.c:3157:6: warning: no previous prototype for function 'clk_debug_print_hw' [-Wmissing-prototypes]
   void clk_debug_print_hw(struct clk_core *clk, struct seq_file *f)
        ^
   drivers/clk/clk.c:3157:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void clk_debug_print_hw(struct clk_core *clk, struct seq_file *f)
   ^
   static 
   3 warnings generated.
   drivers/clk/clk.c:4257: warning: Function parameter or member 'dev' not described in 'devm_clk_unregister'
   drivers/clk/clk.c:4455: warning: Function parameter or member 'get_hw' not described in 'of_clk_provider'


vim +/ignore +624 drivers/clk/clk.c

   618	
   619	/*
   620	 * Update voltage level given the current votes.
   621	 */
   622	static int clk_update_vdd(struct clk_vdd_class *vdd_class)
   623	{
 > 624		int level, rc = 0, i, ignore;
   625		struct regulator **r = vdd_class->regulator;
   626		int *uv = vdd_class->vdd_uv;
   627		int n_reg = vdd_class->num_regulators;
   628		int cur_lvl = vdd_class->cur_level;
   629		int max_lvl = vdd_class->num_levels - 1;
   630		int cur_base = cur_lvl * n_reg;
   631		int new_base;
   632	
   633		/* aggregate votes */
   634		for (level = max_lvl; level > 0; level--)
   635			if (vdd_class->level_votes[level])
   636				break;
   637	
   638		if (level == cur_lvl)
   639			return 0;
   640	
   641		max_lvl = max_lvl * n_reg;
   642		new_base = level * n_reg;
   643	
   644		for (i = 0; i < vdd_class->num_regulators; i++) {
   645			pr_debug("Set Voltage level Min %d, Max %d\n", uv[new_base + i],
   646					uv[max_lvl + i]);
   647			rc = regulator_set_voltage(r[i], uv[new_base + i], INT_MAX);
   648			if (rc)
   649				goto set_voltage_fail;
   650	
   651			if (cur_lvl == 0 || cur_lvl == vdd_class->num_levels)
   652				rc = regulator_enable(r[i]);
   653			else if (level == 0)
   654				rc = regulator_disable(r[i]);
   655			if (rc)
   656				goto enable_disable_fail;
   657		}
   658	
   659		if (vdd_class->set_vdd && !vdd_class->num_regulators)
   660			rc = vdd_class->set_vdd(vdd_class, level);
   661	
   662		if (!rc)
   663			vdd_class->cur_level = level;
   664	
   665		return rc;
   666	
   667	enable_disable_fail:
   668		regulator_set_voltage(r[i], uv[cur_base + i], INT_MAX);
   669	
   670	set_voltage_fail:
   671		for (i--; i >= 0; i--) {
   672			regulator_set_voltage(r[i], uv[cur_base + i], INT_MAX);
   673			if (cur_lvl == 0 || cur_lvl == vdd_class->num_levels)
   674				regulator_disable(r[i]);
   675			else if (level == 0)
   676				ignore = regulator_enable(r[i]);
   677		}
   678	
   679		return rc;
   680	}
   681	

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