[rgushchin:bpfsched.rfc 5/7] kernel/sched/fair.c:4453:27: error: implicit declaration of function 'bpf_sched_cfs_check_preempt_tick'

[kernel test robot <lkp@intel.com>]

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tree:   https://github.com/rgushchin/linux.git bpfsched.rfc
head:   f4c466accae6c27a4fbece80f8cec431f685a20c
commit: b70be3f6434db637797b13c3680a698ab96a5df3 [5/7] sched: cfs: add bpf hooks to control wakeup and tick preemption
config: s390-randconfig-r033-20210915 (attached as .config)
compiler: s390-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/rgushchin/linux/commit/b70be3f6434db637797b13c3680a698ab96a5df3
        git remote add rgushchin https://github.com/rgushchin/linux.git
        git fetch --no-tags rgushchin bpfsched.rfc
        git checkout b70be3f6434db637797b13c3680a698ab96a5df3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=s390 

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/fair.c: In function 'check_preempt_tick':
>> kernel/sched/fair.c:4453:27: error: implicit declaration of function 'bpf_sched_cfs_check_preempt_tick' [-Werror=implicit-function-declaration]
    4453 |                 int ret = bpf_sched_cfs_check_preempt_tick(curr, delta_exec);
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c: At top level:
   kernel/sched/fair.c:5493:6: warning: no previous prototype for 'init_cfs_bandwidth' [-Wmissing-prototypes]
    5493 | void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
         |      ^~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c: In function 'wakeup_preempt_entity':
>> kernel/sched/fair.c:7098:27: error: implicit declaration of function 'bpf_sched_cfs_wakeup_preempt_entity' [-Werror=implicit-function-declaration]
    7098 |                 int ret = bpf_sched_cfs_wakeup_preempt_entity(curr, se);
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c: In function 'check_preempt_wakeup':
>> kernel/sched/fair.c:7190:27: error: implicit declaration of function 'bpf_sched_cfs_check_preempt_wakeup' [-Werror=implicit-function-declaration]
    7190 |                 int ret = bpf_sched_cfs_check_preempt_wakeup(current, p);
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c: At top level:
   kernel/sched/fair.c:11631:6: warning: no previous prototype for 'free_fair_sched_group' [-Wmissing-prototypes]
   11631 | void free_fair_sched_group(struct task_group *tg) { }
         |      ^~~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c:11633:5: warning: no previous prototype for 'alloc_fair_sched_group' [-Wmissing-prototypes]
   11633 | int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
         |     ^~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c:11638:6: warning: no previous prototype for 'online_fair_sched_group' [-Wmissing-prototypes]
   11638 | void online_fair_sched_group(struct task_group *tg) { }
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c:11640:6: warning: no previous prototype for 'unregister_fair_sched_group' [-Wmissing-prototypes]
   11640 | void unregister_fair_sched_group(struct task_group *tg) { }
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/bpf_sched_cfs_check_preempt_tick +4453 kernel/sched/fair.c

  4438	
  4439	/*
  4440	 * Preempt the current task with a newly woken task if needed:
  4441	 */
  4442	static void
  4443	check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
  4444	{
  4445		unsigned long ideal_runtime, delta_exec;
  4446		struct sched_entity *se;
  4447		s64 delta;
  4448	
  4449		ideal_runtime = sched_slice(cfs_rq, curr);
  4450		delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
  4451	
  4452		if (bpf_sched_enabled()) {
> 4453			int ret = bpf_sched_cfs_check_preempt_tick(curr, delta_exec);
  4454	
  4455			if (ret < 0)
  4456				return;
  4457			else if (ret > 0)
  4458				resched_curr(rq_of(cfs_rq));
  4459		}
  4460	
  4461		if (delta_exec > ideal_runtime) {
  4462			resched_curr(rq_of(cfs_rq));
  4463			/*
  4464			 * The current task ran long enough, ensure it doesn't get
  4465			 * re-elected due to buddy favours.
  4466			 */
  4467			clear_buddies(cfs_rq, curr);
  4468			return;
  4469		}
  4470	
  4471		/*
  4472		 * Ensure that a task that missed wakeup preemption by a
  4473		 * narrow margin doesn't have to wait for a full slice.
  4474		 * This also mitigates buddy induced latencies under load.
  4475		 */
  4476		if (delta_exec < sysctl_sched_min_granularity)
  4477			return;
  4478	
  4479		se = __pick_first_entity(cfs_rq);
  4480		delta = curr->vruntime - se->vruntime;
  4481	
  4482		if (delta < 0)
  4483			return;
  4484	
  4485		if (delta > ideal_runtime)
  4486			resched_curr(rq_of(cfs_rq));
  4487	}
  4488	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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