Hi Valentin,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/master]
[also build test ERROR on linus/master next-20211105]
[cannot apply to linux/master v5.15]
[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/Valentin-Schneider/sched-Tweak-default-dynamic-preempt-mode-selection/20211105-184135
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git ea79c24a30aa27ccc4aac26be33f8b73f3f1f59c
config: x86_64-buildonly-randconfig-r004-20211105 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 847a6807332b13f43704327c2d30103ec0347c77)
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/4731291127aa2100c984229a91533b671044a74b
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Valentin-Schneider/sched-Tweak-default-dynamic-preempt-mode-selection/20211105-184135
        git checkout 4731291127aa2100c984229a91533b671044a74b
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   kernel/sched/core.c:3439:6: error: no previous prototype for function 'sched_set_stop_task' [-Werror,-Wmissing-prototypes]
   void sched_set_stop_task(int cpu, struct task_struct *stop)
        ^
   kernel/sched/core.c:3439:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void sched_set_stop_task(int cpu, struct task_struct *stop)
   ^
   static 
>> kernel/sched/core.c:6576:2: error: use of undeclared identifier '__SCT__preempt_schedule'
           static_call_update(preempt_schedule, __preempt_schedule_func);
           ^
   include/linux/static_call.h:154:10: note: expanded from macro 'static_call_update'
           typeof(&STATIC_CALL_TRAMP(name)) __F = (func);                  \
                   ^
   include/linux/static_call_types.h:18:34: note: expanded from macro 'STATIC_CALL_TRAMP'
   #define STATIC_CALL_TRAMP(name)         __PASTE(STATIC_CALL_TRAMP_PREFIX, name)
                                           ^
   include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   #define __PASTE(a,b) ___PASTE(a,b)
                        ^
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   #define ___PASTE(a,b) a##b
                         ^
   <scratch space>:252:1: note: expanded from here
   __SCT__preempt_schedule
   ^
>> kernel/sched/core.c:6576:39: error: use of undeclared identifier '__preempt_schedule_func'; did you mean 'preempt_schedule_irq'?
           static_call_update(preempt_schedule, __preempt_schedule_func);
                                                ^~~~~~~~~~~~~~~~~~~~~~~
                                                preempt_schedule_irq
   include/linux/static_call.h:154:42: note: expanded from macro 'static_call_update'
           typeof(&STATIC_CALL_TRAMP(name)) __F = (func);                  \
                                                   ^
   include/linux/sched.h:291:17: note: 'preempt_schedule_irq' declared here
   asmlinkage void preempt_schedule_irq(void);
                   ^
>> kernel/sched/core.c:6576:2: error: use of undeclared identifier '__SCK__preempt_schedule'
           static_call_update(preempt_schedule, __preempt_schedule_func);
           ^
   include/linux/static_call.h:155:24: note: expanded from macro 'static_call_update'
           __static_call_update(&STATIC_CALL_KEY(name),                    \
                                 ^
   include/linux/static_call_types.h:12:32: note: expanded from macro 'STATIC_CALL_KEY'
   #define STATIC_CALL_KEY(name)           __PASTE(STATIC_CALL_KEY_PREFIX, name)
                                           ^
   include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   #define __PASTE(a,b) ___PASTE(a,b)
                        ^
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   #define ___PASTE(a,b) a##b
                         ^
   <scratch space>:253:1: note: expanded from here
   __SCK__preempt_schedule
   ^
>> kernel/sched/core.c:6576:2: error: use of undeclared identifier '__SCT__preempt_schedule'
   include/linux/static_call.h:156:9: note: expanded from macro 'static_call_update'
                                STATIC_CALL_TRAMP_ADDR(name), __F);        \
                                ^
   include/linux/static_call.h:146:39: note: expanded from macro 'STATIC_CALL_TRAMP_ADDR'
   #define STATIC_CALL_TRAMP_ADDR(name) &STATIC_CALL_TRAMP(name)
                                         ^
   include/linux/static_call_types.h:18:34: note: expanded from macro 'STATIC_CALL_TRAMP'
   #define STATIC_CALL_TRAMP(name)         __PASTE(STATIC_CALL_TRAMP_PREFIX, name)
                                           ^
   include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   #define __PASTE(a,b) ___PASTE(a,b)
                        ^
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   #define ___PASTE(a,b) a##b
                         ^
   <scratch space>:254:1: note: expanded from here
   __SCT__preempt_schedule
   ^
>> kernel/sched/core.c:6577:2: error: use of undeclared identifier '__SCT__preempt_schedule_notrace'
           static_call_update(preempt_schedule_notrace, __preempt_schedule_notrace_func);
           ^
   include/linux/static_call.h:154:10: note: expanded from macro 'static_call_update'
           typeof(&STATIC_CALL_TRAMP(name)) __F = (func);                  \
                   ^
   include/linux/static_call_types.h:18:34: note: expanded from macro 'STATIC_CALL_TRAMP'
   #define STATIC_CALL_TRAMP(name)         __PASTE(STATIC_CALL_TRAMP_PREFIX, name)
                                           ^
   include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   #define __PASTE(a,b) ___PASTE(a,b)
                        ^
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   #define ___PASTE(a,b) a##b
                         ^
   <scratch space>:255:1: note: expanded from here
   __SCT__preempt_schedule_notrace
   ^
>> kernel/sched/core.c:6577:47: error: use of undeclared identifier '__preempt_schedule_notrace_func'
           static_call_update(preempt_schedule_notrace, __preempt_schedule_notrace_func);
                                                        ^
>> kernel/sched/core.c:6577:2: error: use of undeclared identifier '__SCK__preempt_schedule_notrace'
           static_call_update(preempt_schedule_notrace, __preempt_schedule_notrace_func);
           ^
   include/linux/static_call.h:155:24: note: expanded from macro 'static_call_update'
           __static_call_update(&STATIC_CALL_KEY(name),                    \
                                 ^
   include/linux/static_call_types.h:12:32: note: expanded from macro 'STATIC_CALL_KEY'
   #define STATIC_CALL_KEY(name)           __PASTE(STATIC_CALL_KEY_PREFIX, name)
                                           ^
   include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   #define __PASTE(a,b) ___PASTE(a,b)
                        ^
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   #define ___PASTE(a,b) a##b
                         ^
   <scratch space>:256:1: note: expanded from here
   __SCK__preempt_schedule_notrace
   ^
>> kernel/sched/core.c:6577:2: error: use of undeclared identifier '__SCT__preempt_schedule_notrace'
   include/linux/static_call.h:156:9: note: expanded from macro 'static_call_update'
                                STATIC_CALL_TRAMP_ADDR(name), __F);        \
                                ^
   include/linux/static_call.h:146:39: note: expanded from macro 'STATIC_CALL_TRAMP_ADDR'
   #define STATIC_CALL_TRAMP_ADDR(name) &STATIC_CALL_TRAMP(name)
                                         ^
   include/linux/static_call_types.h:18:34: note: expanded from macro 'STATIC_CALL_TRAMP'
   #define STATIC_CALL_TRAMP(name)         __PASTE(STATIC_CALL_TRAMP_PREFIX, name)
                                           ^
   include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   #define __PASTE(a,b) ___PASTE(a,b)
                        ^
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   #define ___PASTE(a,b) a##b
                         ^
   <scratch space>:257:1: note: expanded from here
   __SCT__preempt_schedule_notrace
   ^
   kernel/sched/core.c:6584:3: error: use of undeclared identifier '__SCT__preempt_schedule'
                   static_call_update(preempt_schedule, NULL);
                   ^
   include/linux/static_call.h:154:10: note: expanded from macro 'static_call_update'
           typeof(&STATIC_CALL_TRAMP(name)) __F = (func);                  \
                   ^
   include/linux/static_call_types.h:18:34: note: expanded from macro 'STATIC_CALL_TRAMP'
   #define STATIC_CALL_TRAMP(name)         __PASTE(STATIC_CALL_TRAMP_PREFIX, name)
                                           ^
   include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   #define __PASTE(a,b) ___PASTE(a,b)
                        ^
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   #define ___PASTE(a,b) a##b
                         ^
   <scratch space>:11:1: note: expanded from here
   __SCT__preempt_schedule
   ^
   kernel/sched/core.c:6584:3: error: use of undeclared identifier '__SCK__preempt_schedule'
   include/linux/static_call.h:155:24: note: expanded from macro 'static_call_update'
           __static_call_update(&STATIC_CALL_KEY(name),                    \
                                 ^
   include/linux/static_call_types.h:12:32: note: expanded from macro 'STATIC_CALL_KEY'
   #define STATIC_CALL_KEY(name)           __PASTE(STATIC_CALL_KEY_PREFIX, name)
                                           ^
   include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   #define __PASTE(a,b) ___PASTE(a,b)
                        ^
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   #define ___PASTE(a,b) a##b
                         ^
   <scratch space>:12:1: note: expanded from here
   __SCK__preempt_schedule
   ^
   kernel/sched/core.c:6584:3: error: use of undeclared identifier '__SCT__preempt_schedule'
   include/linux/static_call.h:156:9: note: expanded from macro 'static_call_update'
                                STATIC_CALL_TRAMP_ADDR(name), __F);        \
                                ^
   include/linux/static_call.h:146:39: note: expanded from macro 'STATIC_CALL_TRAMP_ADDR'
   #define STATIC_CALL_TRAMP_ADDR(name) &STATIC_CALL_TRAMP(name)
                                         ^
   include/linux/static_call_types.h:18:34: note: expanded from macro 'STATIC_CALL_TRAMP'
   #define STATIC_CALL_TRAMP(name)         __PASTE(STATIC_CALL_TRAMP_PREFIX, name)
                                           ^
   include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   #define __PASTE(a,b) ___PASTE(a,b)
                        ^
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   #define ___PASTE(a,b) a##b
                         ^
   <scratch space>:13:1: note: expanded from here
   __SCT__preempt_schedule
   ^
   kernel/sched/core.c:6585:3: error: use of undeclared identifier '__SCT__preempt_schedule_notrace'
                   static_call_update(preempt_schedule_notrace, NULL);
                   ^
   include/linux/static_call.h:154:10: note: expanded from macro 'static_call_update'
           typeof(&STATIC_CALL_TRAMP(name)) __F = (func);                  \
                   ^
   include/linux/static_call_types.h:18:34: note: expanded from macro 'STATIC_CALL_TRAMP'
   #define STATIC_CALL_TRAMP(name)         __PASTE(STATIC_CALL_TRAMP_PREFIX, name)
                                           ^
   include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   #define __PASTE(a,b) ___PASTE(a,b)
                        ^
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   #define ___PASTE(a,b) a##b
                         ^
   <scratch space>:14:1: note: expanded from here
   __SCT__preempt_schedule_notrace
   ^
   kernel/sched/core.c:6585:3: error: use of undeclared identifier '__SCK__preempt_schedule_notrace'
   include/linux/static_call.h:155:24: note: expanded from macro 'static_call_update'
           __static_call_update(&STATIC_CALL_KEY(name),                    \
                                 ^
   include/linux/static_call_types.h:12:32: note: expanded from macro 'STATIC_CALL_KEY'
   #define STATIC_CALL_KEY(name)           __PASTE(STATIC_CALL_KEY_PREFIX, name)
                                           ^
   include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   #define __PASTE(a,b) ___PASTE(a,b)
                        ^
   include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'


vim +/__SCT__preempt_schedule +6576 kernel/sched/core.c

e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6567  
1011dcce99f802 Peter Zijlstra         2021-03-25  6568  void sched_dynamic_update(int mode)
826bfeb37bb430 Peter Zijlstra (Intel  2021-01-18  6569) {
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6570  	/*
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6571  	 * Avoid {NONE,VOLUNTARY} -> FULL transitions from ever ending up in
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6572  	 * the ZERO state, which is invalid.
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6573  	 */
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6574  	static_call_update(cond_resched, __cond_resched);
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6575  	static_call_update(might_resched, __cond_resched);
e59e10f8ef63d4 Peter Zijlstra         2021-01-22 @6576  	static_call_update(preempt_schedule, __preempt_schedule_func);
e59e10f8ef63d4 Peter Zijlstra         2021-01-22 @6577  	static_call_update(preempt_schedule_notrace, __preempt_schedule_notrace_func);
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6578  	static_call_update(irqentry_exit_cond_resched, irqentry_exit_cond_resched);
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6579  
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6580  	switch (mode) {
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6581  	case preempt_dynamic_none:
826bfeb37bb430 Peter Zijlstra (Intel  2021-01-18  6582) 		static_call_update(cond_resched, __cond_resched);
9432bbd969c667 Peter Zijlstra         2021-03-23  6583  		static_call_update(might_resched, (void *)&__static_call_return0);
9432bbd969c667 Peter Zijlstra         2021-03-23  6584  		static_call_update(preempt_schedule, NULL);
9432bbd969c667 Peter Zijlstra         2021-03-23  6585  		static_call_update(preempt_schedule_notrace, NULL);
9432bbd969c667 Peter Zijlstra         2021-03-23  6586  		static_call_update(irqentry_exit_cond_resched, NULL);
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6587  		pr_info("Dynamic Preempt: none\n");
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6588  		break;
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6589  
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6590  	case preempt_dynamic_voluntary:
826bfeb37bb430 Peter Zijlstra (Intel  2021-01-18  6591) 		static_call_update(cond_resched, __cond_resched);
826bfeb37bb430 Peter Zijlstra (Intel  2021-01-18  6592) 		static_call_update(might_resched, __cond_resched);
9432bbd969c667 Peter Zijlstra         2021-03-23  6593  		static_call_update(preempt_schedule, NULL);
9432bbd969c667 Peter Zijlstra         2021-03-23  6594  		static_call_update(preempt_schedule_notrace, NULL);
9432bbd969c667 Peter Zijlstra         2021-03-23  6595  		static_call_update(irqentry_exit_cond_resched, NULL);
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6596  		pr_info("Dynamic Preempt: voluntary\n");
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6597  		break;
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6598  
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6599  	case preempt_dynamic_full:
9432bbd969c667 Peter Zijlstra         2021-03-23  6600  		static_call_update(cond_resched, (void *)&__static_call_return0);
9432bbd969c667 Peter Zijlstra         2021-03-23  6601  		static_call_update(might_resched, (void *)&__static_call_return0);
826bfeb37bb430 Peter Zijlstra (Intel  2021-01-18  6602) 		static_call_update(preempt_schedule, __preempt_schedule_func);
826bfeb37bb430 Peter Zijlstra (Intel  2021-01-18  6603) 		static_call_update(preempt_schedule_notrace, __preempt_schedule_notrace_func);
826bfeb37bb430 Peter Zijlstra (Intel  2021-01-18  6604) 		static_call_update(irqentry_exit_cond_resched, irqentry_exit_cond_resched);
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6605  		pr_info("Dynamic Preempt: full\n");
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6606  		break;
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6607  	}
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6608  
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6609  	preempt_dynamic_mode = mode;
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6610  }
e59e10f8ef63d4 Peter Zijlstra         2021-01-22  6611  

---
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