tree: https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/kentry head: fb951a475a1cd1e5e280ee8b4ce64a6a68c77b64 commit: dcdc171ab7d985c6e6eea0c4ccefb5785250ff8e [2/11] kentry: Rename irqentry to kentry config: i386-randconfig-a003-20210519 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?id... git remote add luto https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git git fetch --no-tags luto x86/kentry git checkout dcdc171ab7d985c6e6eea0c4ccefb5785250ff8e # save the attached .config to linux build tree make W=1 ARCH=i386 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/sched/core.c:2850:6: warning: no previous prototype for 'sched_set_stop_task' [-Wmissing-prototypes] 2850 | void sched_set_stop_task(int cpu, struct task_struct *stop) | ^~~~~~~~~~~~~~~~~~~ kernel/sched/core.c: In function 'sched_dynamic_update': 5476 | static_call_update(kentry_exit_cond_resched, (typeof(&kentry_exit_cond_resched)), NULL); | ^ In file included from include/linux/tracepoint.h:22, from include/trace/events/sched.h:10, from kernel/sched/core.c:10: include/linux/static_call.h:119: note: macro "static_call_update" defined here 119 | #define static_call_update(name, func) \ | 5476 | static_call_update(kentry_exit_cond_resched, (typeof(&kentry_exit_cond_resched)), NULL); | ^~~~~~~~~~~~~~~~~~ | static_call_site kernel/sched/core.c:5476:3: note: each undeclared identifier is reported only once for each function it appears in kernel/sched/core.c:5485:89: error: macro "static_call_update" passed 3 arguments, but takes just 2 5485 | static_call_update(kentry_exit_cond_resched, (typeof(&kentry_exit_cond_resched)), NULL); | ^ In file included from include/linux/tracepoint.h:22, from include/trace/events/sched.h:10, from kernel/sched/core.c:10: include/linux/static_call.h:119: note: macro "static_call_update" defined here 119 | #define static_call_update(name, func) \ | vim +/static_call_update +5476 kernel/sched/core.c 5457 5458 void sched_dynamic_update(int mode) 5459 { 5460 /* 5461 * Avoid {NONE,VOLUNTARY} -> FULL transitions from ever ending up in 5462 * the ZERO state, which is invalid. 5463 */ 5464 static_call_update(cond_resched, __cond_resched); 5465 static_call_update(might_resched, __cond_resched); 5466 static_call_update(preempt_schedule, __preempt_schedule_func); 5467 static_call_update(preempt_schedule_notrace, __preempt_schedule_notrace_func); 5468 static_call_update(kentry_exit_cond_resched, kentry_exit_cond_resched); 5469 5470 switch (mode) { 5471 case preempt_dynamic_none: 5472 static_call_update(cond_resched, __cond_resched); 5473 static_call_update(might_resched, (void *)&__static_call_return0); 5474 static_call_update(preempt_schedule, NULL); 5475 static_call_update(preempt_schedule_notrace, NULL); 5477 pr_info("Dynamic Preempt: none\n"); 5478 break; 5479 5480 case preempt_dynamic_voluntary: 5481 static_call_update(cond_resched, __cond_resched); 5482 static_call_update(might_resched, __cond_resched); 5483 static_call_update(preempt_schedule, NULL); 5484 static_call_update(preempt_schedule_notrace, NULL); 5485 static_call_update(kentry_exit_cond_resched, (typeof(&kentry_exit_cond_resched)), NULL); 5486 pr_info("Dynamic Preempt: voluntary\n"); 5487 break; 5488 5489 case preempt_dynamic_full: 5490 static_call_update(cond_resched, (void *)&__static_call_return0); 5491 static_call_update(might_resched, (void *)&__static_call_return0); 5492 static_call_update(preempt_schedule, __preempt_schedule_func); 5493 static_call_update(preempt_schedule_notrace, __preempt_schedule_notrace_func); 5494 static_call_update(kentry_exit_cond_resched, kentry_exit_cond_resched); 5495 pr_info("Dynamic Preempt: full\n"); 5496 break; 5497 } 5498 5499 preempt_dynamic_mode = mode; 5500 } 5501 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org