linux-kernel - Re: [PATCH v4 2/2] clk: fractional-divider: tests: Add test suite for edge cases

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Date:   Sat, 17 Jun 2023 20:15:20 +0800
From:   kernel test robot <lkp@...el.com>
To:     Frank Oltmanns <frank@...manns.dev>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        Frank Oltmanns <frank@...manns.dev>,
        "A.s. Dong" <aisheng.dong@....com>,
        Abel Vesa <abelvesa@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, NXP Linux Team <linux-imx@....com>,
        Peng Fan <peng.fan@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Elaine Zhang <zhangqing@...k-chips.com>
Subject: Re: [PATCH v4 2/2] clk: fractional-divider: tests: Add test suite
 for edge cases

Hi Frank,

kernel test robot noticed the following build warnings:

[auto build test WARNING on clk/clk-next]
[also build test WARNING on linus/master v6.4-rc6 next-20230616]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Frank-Oltmanns/clk-fractional-divider-Improve-approximation-when-zero-based-and-export/20230617-183118
base:   https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git clk-next
patch link:    https://lore.kernel.org/r/20230617102919.27564-3-frank%40oltmanns.dev
patch subject: [PATCH v4 2/2] clk: fractional-divider: tests: Add test suite for edge cases
config: hexagon-randconfig-r035-20230617 (https://download.01.org/0day-ci/archive/20230617/202306172036.EevtaVp6-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230617/202306172036.EevtaVp6-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/202306172036.EevtaVp6-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/clk/clk-fractional-divider_test.c:26:41: warning: variable 'max_m' set but not used [-Wunused-but-set-variable]
      26 |         unsigned long rate, parent_rate, m, n, max_m, max_n;
         |                                                ^
   drivers/clk/clk-fractional-divider_test.c:88:41: warning: variable 'max_m' set but not used [-Wunused-but-set-variable]
      88 |         unsigned long rate, parent_rate, m, n, max_m, max_n;
         |                                                ^
   2 warnings generated.


vim +/max_m +26 drivers/clk/clk-fractional-divider_test.c

    15	
    16	/*
    17	 * Test the maximum denominator case for fd clock without flags.
    18	 *
    19	 * Expect the highest possible denominator to be used in order to get as close as possible to the
    20	 * requested rate.
    21	 */
    22	static void clk_fd_test_approximation_max_denominator(struct kunit *test)
    23	{
    24		struct clk_fractional_divider *fd;
    25		struct clk_hw *hw;
  > 26		unsigned long rate, parent_rate, m, n, max_m, max_n;
    27	
    28		fd = kunit_kzalloc(test, sizeof(*fd), GFP_KERNEL);
    29		KUNIT_ASSERT_NOT_NULL(test, fd);
    30	
    31		fd->mwidth = 3;
    32		max_m = 7;
    33		fd->nwidth = 3;
    34		max_n = 7;
    35	
    36		hw = &fd->hw;
    37	
    38		rate = 240000000;
    39		parent_rate = (max_n + 1) * rate; /* so that it exceeds the maximum divisor */
    40	
    41		clk_fractional_divider_general_approximation(hw, rate, &parent_rate, &m, &n);
    42		KUNIT_EXPECT_EQ(test, parent_rate, (max_n + 1) * rate); /* parent remains unchanged */
    43		KUNIT_EXPECT_EQ(test, m, 1);
    44		KUNIT_EXPECT_EQ(test, n, max_n);
    45	}
    46	

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