[xlnx:master 58/146] drivers/clk/clk-xlnx-clock-wizard.c:184: undefined reference to `__udivdi3'

[kernel test robot]

tree:   https://github.com/Xilinx/linux-xlnx master
head:   3cb48250f25110e9aed4699c993e1b229e363402
commit: b271f193cc94e177383886cc00e3bc62a7c3ead7 [58/146] clk: clock-wizard: Use all stages of the MMCM
config: i386-randconfig-s002-20200921 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-201-g24bdaac6-dirty
        git checkout b271f193cc94e177383886cc00e3bc62a7c3ead7
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

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

All errors (new ones prefixed by >>):

   ld: drivers/clk/clk-xlnx-clock-wizard.o: in function `clk_wzrd_calc_hints':
>> drivers/clk/clk-xlnx-clock-wizard.c:184: undefined reference to `__udivdi3'
>> ld: drivers/clk/clk-xlnx-clock-wizard.c:186: undefined reference to `__udivdi3'
   ld: drivers/clk/clk-xlnx-clock-wizard.c:207: undefined reference to `__udivdi3'
   ld: drivers/clk/clk-xlnx-clock-wizard.c:198: undefined reference to `__udivdi3'

# https://github.com/Xilinx/linux-xlnx/commit/b271f193cc94e177383886cc00e3bc62a7c3ead7
git remote add xlnx https://github.com/Xilinx/linux-xlnx
git fetch --no-tags xlnx master
git checkout b271f193cc94e177383886cc00e3bc62a7c3ead7
vim +184 drivers/clk/clk-xlnx-clock-wizard.c

   150	
   151	/*
   152	 * This is where all the magic happens. For arbitrary frequency generation
   153	 * applications all of the knobs for adjusting the frequency must be
   154	 * considered together. Nothing is set in this function we just provide
   155	 * hints for use by the actual set_rate functions. If things don't match
   156	 * up the hints can always be ignored
   157	 */
   158	static void clk_wzrd_calc_hints(struct clk_wzrd *clk_wzrd, unsigned long rate,
   159					unsigned long in_rate)
   160	{
   161		int i, j;
   162	
   163		unsigned int divclk_divide_max, divclk_divide_max_calc;
   164		unsigned int clkbout_min, clkbout_max;
   165		unsigned int clkout_divide = 1;
   166		unsigned int best_divclk = 1;
   167		unsigned int best_clkfbout_mult_f = 1;
   168		unsigned int best_clkout_divide = 1;
   169		unsigned int best_out_freq = 1;
   170		u64 vco_freq, best_vco_freq = 1;
   171		u64 out_freq = 1;
   172		u64 error;
   173		u64 min_error = 100000000000;
   174	
   175		clk_wzrd->hints.valid_rate = false;
   176	
   177		divclk_divide_max_calc = in_rate / MIN_IN_FREQ;
   178		divclk_divide_max = min(DIVCLK_DIVIDE_MAX,
   179					divclk_divide_max_calc);
   180	
   181		/* First go through all possible DIVCLK_DIVIDE values */
   182		for (i = 1; i <= divclk_divide_max; i++) {
   183			/* 8*125 is x1000 */
 > 184			clkbout_min = DIV_ROUND_UP(MIN_VCO_FREQ * i * 8, in_rate) *
   185				      125;
 > 186			clkbout_max = (MAX_VCO_FREQ * i * 8 / in_rate) * 125;
   187			clkbout_min = max(CLKFBOUT_MULT_F_MIN, clkbout_min);
   188			clkbout_max = min(CLKFBOUT_MULT_F_MAX, clkbout_max);
   189			/* Second go through all CLKFBOUT_MULT values */
   190			for (j = clkbout_min; j <= clkbout_max; j += 125) {
   191				vco_freq = in_rate * j / i;
   192				/*
   193				 * Finally calculate out the CLKOUT_DIVIDE
   194				 * there is no need to iterate here
   195				 * just calculate the closest
   196				 */
   197				clkout_divide =
   198					DIV_ROUND_CLOSEST(vco_freq,
   199							  (u64)rate * 125) * 125;
   200				clkout_divide = clamp(clkout_divide,
   201						      CLKOUT_DIVIDE_F_MIN,
   202						      CLKOUT_DIVIDE_F_MAX);
   203				out_freq = in_rate * j / i / clkout_divide;
   204				error = abs(rate - out_freq);
   205				if (error < min_error) {
   206					min_error = error;
   207					best_vco_freq = vco_freq / 1000;
   208					best_out_freq = out_freq;
   209					best_divclk = i;
   210					best_clkfbout_mult_f = j;
   211					best_clkout_divide = clkout_divide;
   212				}
   213			}
   214		}
   215	
   216		clk_wzrd->hints.req_rate = rate;
   217		clk_wzrd->hints.vco_rate = best_vco_freq;
   218		clk_wzrd->hints.div_rate = in_rate / best_divclk;
   219		clk_wzrd->hints.best_rate = best_out_freq;
   220		clk_wzrd->hints.divclk_divide = best_divclk;
   221		clk_wzrd->hints.clkfbout_mult_f = best_clkfbout_mult_f;
   222		clk_wzrd->hints.clkout_divide = best_clkout_divide;
   223		clk_wzrd->hints.valid_rate = true;
   224	

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