linux-kernel - Re: [PATCH 08/13] clk: amlogic: Add PLL driver

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Message-ID: <202602092354.9sJeoo5S-lkp@intel.com>
Date: Mon, 9 Feb 2026 23:37:17 +0800
From: kernel test robot <lkp@...el.com>
To: Chuan Liu via B4 Relay <devnull+chuan.liu.amlogic.com@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-amlogic@...ts.infradead.org,
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Chuan Liu <chuan.liu@...ogic.com>
Subject: Re: [PATCH 08/13] clk: amlogic: Add PLL driver

Hi Chuan,

kernel test robot noticed the following build errors:

[auto build test ERROR on 4d310797262f0ddf129e76c2aad2b950adaf1fda]

url:    https://github.com/intel-lab-lkp/linux/commits/Chuan-Liu-via-B4-Relay/dt-bindings-clock-Add-Amlogic-A9-standardized-model-clock-control-units/20260209-135334
base:   4d310797262f0ddf129e76c2aad2b950adaf1fda
patch link:    https://lore.kernel.org/r/20260209-a9_clock_driver-v1-8-a9198dc03d2a%40amlogic.com
patch subject: [PATCH 08/13] clk: amlogic: Add PLL driver
config: arm-randconfig-003-20260209 (https://download.01.org/0day-ci/archive/20260209/202602092354.9sJeoo5S-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260209/202602092354.9sJeoo5S-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602092354.9sJeoo5S-lkp@intel.com/

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: drivers/clk/amlogic/clk-pll.o: in function `aml_pll_available_rates_show':
>> drivers/clk/amlogic/clk-pll.c:554: undefined reference to `__aeabi_uldivmod'
>> arm-linux-gnueabi-ld: drivers/clk/amlogic/clk-pll.c:567: undefined reference to `__aeabi_uldivmod'
>> arm-linux-gnueabi-ld: drivers/clk/amlogic/clk-pll.c:554: undefined reference to `__aeabi_uldivmod'


vim +554 drivers/clk/amlogic/clk-pll.c

   536	
   537	static int aml_pll_get_best_rate(unsigned long rate, unsigned long step_rate,
   538					 u64 min_vco_rate, u64 max_vco_rate,
   539					 u8 od_max, enum round_type round,
   540					 unsigned long *out_rate)
   541	{
   542		int i;
   543		u64 vco_rate;
   544		unsigned long now_rate, best_rate = 0;
   545	
   546		for (i = 0; i <= od_max; i++) {
   547			vco_rate = rate << i;
   548			if (vco_rate < min_vco_rate)
   549				continue;
   550	
   551			if (vco_rate > max_vco_rate)
   552				break;
   553	
 > 554			if (vco_rate % step_rate == 0) {
   555				best_rate = rate;
   556	
   557				break;
   558			}
   559	
   560			if (round == ROUND_DOWN) {
   561				vco_rate = vco_rate - (vco_rate % step_rate);
   562				now_rate = vco_rate >> i;
   563				if ((rate - now_rate) < (rate - best_rate))
   564					best_rate = now_rate;
   565			} else {
   566				vco_rate = vco_rate + step_rate;
 > 567				vco_rate = vco_rate - (vco_rate % step_rate);
   568				now_rate = vco_rate >> i;
   569				if ((now_rate - rate) < (best_rate - rate))
   570					best_rate = now_rate;
   571			}
   572		}
   573	
   574		if (!best_rate)
   575			return -EINVAL;
   576	
   577		*out_rate = best_rate;
   578	
   579		return 0;
   580	}
   581	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki