Hi Samuel, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 7c8ca8129ee9724cb1527895fe6dec942ef07f19 commit: 3952ec2ac55a5afcda84270fa203f17a6309af6b [1015/6320] ASoC: sun8i-codec: Protect the clock rate while streams are open config: m68k-randconfig-r004-20201117 (attached as .config) compiler: m68k-linux-gcc (GCC) 9.3.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 3952ec2ac55a5afcda84270fa203f17a6309af6b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 855 | void clk_unprepare(struct clk *clk) | ^~~~~~~~~~~~~ In file included from drivers/clk/clk.c:9: include/linux/clk.h:263:20: note: previous definition of 'clk_unprepare' was here 263 | static inline void clk_unprepare(struct clk *clk) | ^~~~~~~~~~~~~ 936 | int clk_prepare(struct clk *clk) | ^~~~~~~~~~~ In file included from drivers/clk/clk.c:9: include/linux/clk.h:236:19: note: previous definition of 'clk_prepare' was here 236 | static inline int clk_prepare(struct clk *clk) | ^~~~~~~~~~~ vim +/clk_unprepare +855 drivers/clk/clk.c a6adc30ba7bef8d Dong Aisheng 2016-06-30 843 4dff95dc9477a34 Stephen Boyd 2015-04-30 844 /** 4dff95dc9477a34 Stephen Boyd 2015-04-30 845 * clk_unprepare - undo preparation of a clock source 4dff95dc9477a34 Stephen Boyd 2015-04-30 846 * @clk: the clk being unprepared 4dff95dc9477a34 Stephen Boyd 2015-04-30 847 * 4dff95dc9477a34 Stephen Boyd 2015-04-30 848 * clk_unprepare may sleep, which differentiates it from clk_disable. In a 4dff95dc9477a34 Stephen Boyd 2015-04-30 849 * simple case, clk_unprepare can be used instead of clk_disable to gate a clk 4dff95dc9477a34 Stephen Boyd 2015-04-30 850 * if the operation may sleep. One example is a clk which is accessed over 4dff95dc9477a34 Stephen Boyd 2015-04-30 851 * I2c. In the complex case a clk gate operation may require a fast and a slow 4dff95dc9477a34 Stephen Boyd 2015-04-30 852 * part. It is this reason that clk_unprepare and clk_disable are not mutually 4dff95dc9477a34 Stephen Boyd 2015-04-30 853 * exclusive. In fact clk_disable must be called before clk_unprepare. 4dff95dc9477a34 Stephen Boyd 2015-04-30 854 */ 4dff95dc9477a34 Stephen Boyd 2015-04-30 @855 void clk_unprepare(struct clk *clk) b2476490ef11134 Mike Turquette 2012-03-15 856 { 4dff95dc9477a34 Stephen Boyd 2015-04-30 857 if (IS_ERR_OR_NULL(clk)) 4dff95dc9477a34 Stephen Boyd 2015-04-30 858 return; b2476490ef11134 Mike Turquette 2012-03-15 859 a6adc30ba7bef8d Dong Aisheng 2016-06-30 860 clk_core_unprepare_lock(clk->core); 1e435256d625c20 Olof Johansson 2013-04-27 861 } 4dff95dc9477a34 Stephen Boyd 2015-04-30 862 EXPORT_SYMBOL_GPL(clk_unprepare); 1e435256d625c20 Olof Johansson 2013-04-27 863 4dff95dc9477a34 Stephen Boyd 2015-04-30 864 static int clk_core_prepare(struct clk_core *core) 4dff95dc9477a34 Stephen Boyd 2015-04-30 865 { 4dff95dc9477a34 Stephen Boyd 2015-04-30 866 int ret = 0; b2476490ef11134 Mike Turquette 2012-03-15 867 a63347251907d7f Stephen Boyd 2015-05-06 868 lockdep_assert_held(&prepare_lock); a63347251907d7f Stephen Boyd 2015-05-06 869 4dff95dc9477a34 Stephen Boyd 2015-04-30 870 if (!core) 4dff95dc9477a34 Stephen Boyd 2015-04-30 871 return 0; b2476490ef11134 Mike Turquette 2012-03-15 872 4dff95dc9477a34 Stephen Boyd 2015-04-30 873 if (core->prepare_count == 0) { 9a34b45397e5a38 Marek Szyprowski 2017-08-21 874 ret = clk_pm_runtime_get(core); 4dff95dc9477a34 Stephen Boyd 2015-04-30 875 if (ret) 4dff95dc9477a34 Stephen Boyd 2015-04-30 876 return ret; b2476490ef11134 Mike Turquette 2012-03-15 877 9a34b45397e5a38 Marek Szyprowski 2017-08-21 878 ret = clk_core_prepare(core->parent); 9a34b45397e5a38 Marek Szyprowski 2017-08-21 879 if (ret) 9a34b45397e5a38 Marek Szyprowski 2017-08-21 880 goto runtime_put; 9a34b45397e5a38 Marek Szyprowski 2017-08-21 881 4dff95dc9477a34 Stephen Boyd 2015-04-30 882 trace_clk_prepare(core); 1c155b3dfe08351 Ulf Hansson 2013-03-12 883 4dff95dc9477a34 Stephen Boyd 2015-04-30 884 if (core->ops->prepare) 4dff95dc9477a34 Stephen Boyd 2015-04-30 885 ret = core->ops->prepare(core->hw); 1c155b3dfe08351 Ulf Hansson 2013-03-12 886 4dff95dc9477a34 Stephen Boyd 2015-04-30 887 trace_clk_prepare_complete(core); b2476490ef11134 Mike Turquette 2012-03-15 888 9a34b45397e5a38 Marek Szyprowski 2017-08-21 889 if (ret) 9a34b45397e5a38 Marek Szyprowski 2017-08-21 890 goto unprepare; b2476490ef11134 Mike Turquette 2012-03-15 891 } b2476490ef11134 Mike Turquette 2012-03-15 892 4dff95dc9477a34 Stephen Boyd 2015-04-30 893 core->prepare_count++; b2476490ef11134 Mike Turquette 2012-03-15 894 9461f7b33d11cbb Jerome Brunet 2018-06-19 895 /* 9461f7b33d11cbb Jerome Brunet 2018-06-19 896 * CLK_SET_RATE_GATE is a special case of clock protection 9461f7b33d11cbb Jerome Brunet 2018-06-19 897 * Instead of a consumer claiming exclusive rate control, it is 9461f7b33d11cbb Jerome Brunet 2018-06-19 898 * actually the provider which prevents any consumer from making any 9461f7b33d11cbb Jerome Brunet 2018-06-19 899 * operation which could result in a rate change or rate glitch while 9461f7b33d11cbb Jerome Brunet 2018-06-19 900 * the clock is prepared. 9461f7b33d11cbb Jerome Brunet 2018-06-19 901 */ 9461f7b33d11cbb Jerome Brunet 2018-06-19 902 if (core->flags & CLK_SET_RATE_GATE) 9461f7b33d11cbb Jerome Brunet 2018-06-19 903 clk_core_rate_protect(core); 9461f7b33d11cbb Jerome Brunet 2018-06-19 904 4dff95dc9477a34 Stephen Boyd 2015-04-30 905 return 0; 9a34b45397e5a38 Marek Szyprowski 2017-08-21 906 unprepare: 9a34b45397e5a38 Marek Szyprowski 2017-08-21 907 clk_core_unprepare(core->parent); 9a34b45397e5a38 Marek Szyprowski 2017-08-21 908 runtime_put: 9a34b45397e5a38 Marek Szyprowski 2017-08-21 909 clk_pm_runtime_put(core); 9a34b45397e5a38 Marek Szyprowski 2017-08-21 910 return ret; b2476490ef11134 Mike Turquette 2012-03-15 911 } b2476490ef11134 Mike Turquette 2012-03-15 912 a6adc30ba7bef8d Dong Aisheng 2016-06-30 913 static int clk_core_prepare_lock(struct clk_core *core) a6adc30ba7bef8d Dong Aisheng 2016-06-30 914 { a6adc30ba7bef8d Dong Aisheng 2016-06-30 915 int ret; a6adc30ba7bef8d Dong Aisheng 2016-06-30 916 a6adc30ba7bef8d Dong Aisheng 2016-06-30 917 clk_prepare_lock(); a6adc30ba7bef8d Dong Aisheng 2016-06-30 918 ret = clk_core_prepare(core); a6adc30ba7bef8d Dong Aisheng 2016-06-30 919 clk_prepare_unlock(); a6adc30ba7bef8d Dong Aisheng 2016-06-30 920 a6adc30ba7bef8d Dong Aisheng 2016-06-30 921 return ret; a6adc30ba7bef8d Dong Aisheng 2016-06-30 922 } a6adc30ba7bef8d Dong Aisheng 2016-06-30 923 4dff95dc9477a34 Stephen Boyd 2015-04-30 924 /** 4dff95dc9477a34 Stephen Boyd 2015-04-30 925 * clk_prepare - prepare a clock source 4dff95dc9477a34 Stephen Boyd 2015-04-30 926 * @clk: the clk being prepared 4dff95dc9477a34 Stephen Boyd 2015-04-30 927 * 4dff95dc9477a34 Stephen Boyd 2015-04-30 928 * clk_prepare may sleep, which differentiates it from clk_enable. In a simple 4dff95dc9477a34 Stephen Boyd 2015-04-30 929 * case, clk_prepare can be used instead of clk_enable to ungate a clk if the 4dff95dc9477a34 Stephen Boyd 2015-04-30 930 * operation may sleep. One example is a clk which is accessed over I2c. In 4dff95dc9477a34 Stephen Boyd 2015-04-30 931 * the complex case a clk ungate operation may require a fast and a slow part. 4dff95dc9477a34 Stephen Boyd 2015-04-30 932 * It is this reason that clk_prepare and clk_enable are not mutually 4dff95dc9477a34 Stephen Boyd 2015-04-30 933 * exclusive. In fact clk_prepare must be called before clk_enable. 4dff95dc9477a34 Stephen Boyd 2015-04-30 934 * Returns 0 on success, -EERROR otherwise. 4dff95dc9477a34 Stephen Boyd 2015-04-30 935 */ 4dff95dc9477a34 Stephen Boyd 2015-04-30 @936 int clk_prepare(struct clk *clk) b2476490ef11134 Mike Turquette 2012-03-15 937 { 035a61c314eb3da Tomeu Vizoso 2015-01-23 938 if (!clk) 4dff95dc9477a34 Stephen Boyd 2015-04-30 939 return 0; 035a61c314eb3da Tomeu Vizoso 2015-01-23 940 a6adc30ba7bef8d Dong Aisheng 2016-06-30 941 return clk_core_prepare_lock(clk->core); 7ef3dcc8145263c James Hogan 2013-07-29 942 } 4dff95dc9477a34 Stephen Boyd 2015-04-30 943 EXPORT_SYMBOL_GPL(clk_prepare); 035a61c314eb3da Tomeu Vizoso 2015-01-23 944 :::::: The code at line 855 was first introduced by commit :::::: 4dff95dc9477a34de77d24c59dcf1dc593687fcf clk: Remove forward declared function prototypes :::::: TO: Stephen Boyd <sboyd(a)codeaurora.org&gt; :::::: CC: Stephen Boyd <sboyd(a)codeaurora.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org