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Thu, 02 Nov 2023 17:45:14 +0000 Date: Fri, 3 Nov 2023 01:44:39 +0800 From: kernel test robot To: Daniel Hill Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, Kent Overstreet Subject: fs/bcachefs/mean_and_variance.c:78: warning: Function parameter or member 's1' not described in 'mean_and_variance_get_variance' Message-ID: <202311030119.b4CdX9Kv-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 21e80f3841c01aeaf32d7aee7bbc87b3db1aa0c6 commit: 92095781e0f607e735971c1a6462ca6dad8826d2 bcachefs: Mean and variance date: 11 days ago config: nios2-allmodconfig (https://download.01.org/0day-ci/archive/20231103/202311030119.b4CdX9Kv-lkp@intel.com/config) compiler: nios2-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231103/202311030119.b4CdX9Kv-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 | Closes: https://lore.kernel.org/oe-kbuild-all/202311030119.b4CdX9Kv-lkp@intel.com/ All warnings (new ones prefixed by >>): fs/bcachefs/mean_and_variance.c:67: warning: Function parameter or member 's' not described in 'mean_and_variance_get_mean' >> fs/bcachefs/mean_and_variance.c:78: warning: Function parameter or member 's1' not described in 'mean_and_variance_get_variance' >> fs/bcachefs/mean_and_variance.c:94: warning: Function parameter or member 's' not described in 'mean_and_variance_get_stddev' >> fs/bcachefs/mean_and_variance.c:108: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_update' fs/bcachefs/mean_and_variance.c:108: warning: Function parameter or member 'x' not described in 'mean_and_variance_weighted_update' fs/bcachefs/mean_and_variance.c:108: warning: Excess function parameter 's1' description in 'mean_and_variance_weighted_update' fs/bcachefs/mean_and_variance.c:108: warning: Excess function parameter 's2' description in 'mean_and_variance_weighted_update' fs/bcachefs/mean_and_variance.c:134: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_get_mean' fs/bcachefs/mean_and_variance.c:143: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_get_variance' fs/bcachefs/mean_and_variance.c:153: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_get_stddev' vim +78 fs/bcachefs/mean_and_variance.c 71 72 /** 73 * mean_and_variance_get_variance() - get variance from @s1 74 * 75 * see linked pdf equation 12. 76 */ 77 u64 mean_and_variance_get_variance(struct mean_and_variance s1) > 78 { 79 if (s1.n) { 80 u128_u s2 = u128_div(s1.sum_squares, s1.n); 81 u64 s3 = abs(mean_and_variance_get_mean(s1)); 82 83 return u128_lo(u128_sub(s2, u128_square(s3))); 84 } else { 85 return 0; 86 } 87 } 88 EXPORT_SYMBOL_GPL(mean_and_variance_get_variance); 89 90 /** 91 * mean_and_variance_get_stddev() - get standard deviation from @s 92 */ 93 u32 mean_and_variance_get_stddev(struct mean_and_variance s) > 94 { 95 return int_sqrt64(mean_and_variance_get_variance(s)); 96 } 97 EXPORT_SYMBOL_GPL(mean_and_variance_get_stddev); 98 99 /** 100 * mean_and_variance_weighted_update() - exponentially weighted variant of mean_and_variance_update() 101 * @s1: .. 102 * @s2: .. 103 * 104 * see linked pdf: function derived from equations 140-143 where alpha = 2^w. 105 * values are stored bitshifted for performance and added precision. 106 */ 107 void mean_and_variance_weighted_update(struct mean_and_variance_weighted *s, s64 x) > 108 { 109 // previous weighted variance. 110 u8 w = s->weight; 111 u64 var_w0 = s->variance; 112 // new value weighted. 113 s64 x_w = x << w; 114 s64 diff_w = x_w - s->mean; 115 s64 diff = fast_divpow2(diff_w, w); 116 // new mean weighted. 117 s64 u_w1 = s->mean + diff; 118 119 if (!s->init) { 120 s->mean = x_w; 121 s->variance = 0; 122 } else { 123 s->mean = u_w1; 124 s->variance = ((var_w0 << w) - var_w0 + ((diff_w * (x_w - u_w1)) >> w)) >> w; 125 } 126 s->init = true; 127 } 128 EXPORT_SYMBOL_GPL(mean_and_variance_weighted_update); 129 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki