tree: https://github.com/jimc/linux.git dd-drm-next head: 7c9c791fee34dc8f3ef72a288efd6de7b48d5fb2 commit: ec8e20fb31430e6a18affbddaac7fbe29255ffaa [2/8] dyndbg: add DEFINE_DYNAMIC_DEBUG_CATEGORIES and callbacks config: hexagon-randconfig-r045-20210816 (attached as .config) compiler: clang version 12.0.0 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/jimc/linux/commit/ec8e20fb31430e6a18affbddaac7fbe29255... git remote add jimc https://github.com/jimc/linux.git git fetch --no-tags jimc dd-drm-next git checkout ec8e20fb31430e6a18affbddaac7fbe29255ffaa # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=hexagon SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): vim +586 lib/dynamic_debug.c 579 580 /** 581 * param_set_dyndbg() - drm.debug style bits=>categories setter 582 * @instr: string echo>d to sysfs 583 * @kp: struct kernel_param* ->data has bitmap 584 * Exported to support DEFINE_DYNAMIC_DEBUG_CATEGORIES 585 */ 587 int param_set_dyndbg(const char *instr, const struct kernel_param *kp) 588 { 589 unsigned long inbits; 590 int rc, i, matches = 0, totct = 0; 591 char query[FMT_QUERY_SIZE]; 592 const struct dyndbg_bitdesc *bitmap = kp->data; 593 594 if (!bitmap) { 595 pr_err("set_dyndbg: no bits=>queries map\n"); 596 return -EINVAL; 597 } 598 rc = kstrtoul(instr, 0, &inbits); 599 if (rc) { 600 pr_err("set_dyndbg: failed\n"); 601 return rc; 602 } 603 vpr_info("set_dyndbg: input 0x%lx\n", inbits); 604 605 for (i = 0; bitmap->prefix; i++, bitmap++) { 606 snprintf(query, FMT_QUERY_SIZE, "format '^%s' %cp", bitmap->prefix, 607 test_bit(i, &inbits) ? '+' : '-'); 608 609 matches = dynamic_debug_exec_queries(query, kp->mod->name); 610 611 v2pr_info("bit-%d: %d matches on '%s'\n", i, matches, query); 612 totct += matches; 613 } 614 vpr_info("total matches: %d\n", totct); 615 return 0; 616 } 617 EXPORT_SYMBOL(param_set_dyndbg); 618 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org