Hi "Gustavo, Thank you for the patch! Yet something to improve: [auto build test ERROR on tip/perf/core] [also build test ERROR on v5.15] [cannot apply to rostedt-trace/for-next linux/master linus/master next-20211108] [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] url: https://github.com/0day-ci/linux/commits/Gustavo-A-R-Silva/ftrace-Fix-Wca... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 41100833cdd8b1bef363b81a6482d74711c116ad config: xtensa-randconfig-r013-20211004 (attached as .config) compiler: xtensa-linux-gcc (GCC) 11.2.0 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://github.com/0day-ci/linux/commit/9c10c0713155955bf1170eea3904cfcfb... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Gustavo-A-R-Silva/ftrace-Fix-Wcast-function-type-warnings-on-powerpc64/20211005-133606 git checkout 9c10c0713155955bf1170eea3904cfcfb6d2d832 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=xtensa 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 >>): kernel/trace/ftrace.c:586:5: warning: no previous prototype for 'ftrace_profile_pages_init' [-Wmissing-prototypes] 586 | int ftrace_profile_pages_init(struct ftrace_profile_stat *stat) | ^~~~~~~~~~~~~~~~~~~~~~~~~ 870 | .func = function_profile_call, | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/ftrace.c:870:27: note: (near initialization for 'ftrace_profile_ops.func') kernel/trace/ftrace.c:6925:35: error: initialization of 'void (*)(long unsigned int, long unsigned int)' from incompatible pointer type 'void (*)(long unsigned int, long unsigned int, struct ftrace_ops *, struct ftrace_regs *)' [-Werror=incompatible-pointer-types] 6925 | .func = ftrace_stub, | ^~~~~~~~~~~ kernel/trace/ftrace.c:6925:35: note: (near initialization for 'global_ops.func') cc1: some warnings being treated as errors -- kernel/trace/trace.c: In function 'trace_check_vprintf': kernel/trace/trace.c:3827:17: warning: function 'trace_check_vprintf' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 3827 | trace_seq_vprintf(&iter->seq, iter->fmt, ap); | ^~~~~~~~~~~~~~~~~ kernel/trace/trace.c:3882:17: warning: function 'trace_check_vprintf' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 3882 | trace_seq_vprintf(&iter->seq, p, ap); | ^~~~~~~~~~~~~~~~~ In file included from kernel/trace/trace.c:8605: kernel/trace/trace_selftest.c: At top level: 562 | .func = trace_selftest_test_regs_func, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_selftest.c:562:27: note: (near initialization for 'test_regs_probe.func') kernel/trace/trace_selftest.c: In function 'trace_selftest_function_regs': kernel/trace/trace_selftest.c:571:13: warning: variable 'len' set but not used [-Wunused-but-set-variable] 571 | int len; | ^~~ cc1: some warnings being treated as errors vim +870 kernel/trace/ftrace.c 0706f1c48ca8a7 Steven Rostedt 2009-03-23 863 0706f1c48ca8a7 Steven Rostedt 2009-03-23 864 static void unregister_ftrace_profiler(void) 0706f1c48ca8a7 Steven Rostedt 2009-03-23 865 { 688f7089d8851b Steven Rostedt (VMware 2018-11-15 866) unregister_ftrace_graph(&fprofiler_ops); 0706f1c48ca8a7 Steven Rostedt 2009-03-23 867 } 0706f1c48ca8a7 Steven Rostedt 2009-03-23 868 #else bd38c0e6f98326 Paul McQuade 2011-05-31 869 static struct ftrace_ops ftrace_profile_ops __read_mostly = { bac429f037f1a5 Steven Rostedt 2009-03-20 @870 .func = function_profile_call, a25d036d939a30 Steven Rostedt (VMware 2020-11-05 871) .flags = FTRACE_OPS_FL_INITIALIZED, 33b7f99cf003ca Steven Rostedt (Red Hat 2014-08-15 872) INIT_OPS_HASH(ftrace_profile_ops) bac429f037f1a5 Steven Rostedt 2009-03-20 873 }; bac429f037f1a5 Steven Rostedt 2009-03-20 874 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org