[zen-kernel-zen-kernel:5.10/muqss 1/21] kernel/sched/MuQSS.c:4407:35: warning: no previous prototype for 'schedule_user'

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

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tree:   https://github.com/zen-kernel/zen-kernel 5.10/muqss
head:   5e029bcb673aa73c2a432f5f78f60351821f5b33
commit: 9d6b3eef3a1ec22d4d3c74e0b773ff52d3b3a209 [1/21] MultiQueue Skiplist Scheduler v0.204
config: x86_64-rhel (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/zen-kernel/zen-kernel/commit/9d6b3eef3a1ec22d4d3c74e0b773ff52d3b3a209
        git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel
        git fetch --no-tags zen-kernel-zen-kernel 5.10/muqss
        git checkout 9d6b3eef3a1ec22d4d3c74e0b773ff52d3b3a209
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

   kernel/sched/MuQSS.c:241:12: warning: no previous prototype for 'arch_sd_sibling_asym_packing' [-Wmissing-prototypes]
     241 | int __weak arch_sd_sibling_asym_packing(void)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:639:6: warning: no previous prototype for 'resched_task' [-Wmissing-prototypes]
     639 | void resched_task(struct task_struct *p)
         |      ^~~~~~~~~~~~
   kernel/sched/MuQSS.c:2386:5: warning: no previous prototype for 'sysctl_schedstats' [-Wmissing-prototypes]
    2386 | int sysctl_schedstats(struct ctl_table *table, int write, void *buffer,
         |     ^~~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:3076:15: warning: no previous prototype for 'nr_active' [-Wmissing-prototypes]
    3076 | unsigned long nr_active(void)
         |               ^~~~~~~~~
>> kernel/sched/MuQSS.c:4407:35: warning: no previous prototype for 'schedule_user' [-Wmissing-prototypes]
    4407 | asmlinkage __visible void __sched schedule_user(void)
         |                                   ^~~~~~~~~~~~~
   kernel/sched/MuQSS.c:6113:6: warning: no previous prototype for '__do_set_cpus_allowed' [-Wmissing-prototypes]
    6113 | void __do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
         |      ^~~~~~~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:6234:6: warning: no previous prototype for 'resched_cpu' [-Wmissing-prototypes]
    6234 | void resched_cpu(int cpu)
         |      ^~~~~~~~~~~
   kernel/sched/MuQSS.c:6247:6: warning: no previous prototype for 'select_nohz_load_balancer' [-Wmissing-prototypes]
    6247 | void select_nohz_load_balancer(int stop_tick)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:6251:6: warning: no previous prototype for 'set_cpu_sd_state_idle' [-Wmissing-prototypes]
    6251 | void set_cpu_sd_state_idle(void) {}
         |      ^~~~~~~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:6305:6: warning: no previous prototype for 'wake_up_idle_cpu' [-Wmissing-prototypes]
    6305 | void wake_up_idle_cpu(int cpu)
         |      ^~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:6569:6: warning: no previous prototype for 'sched_set_stop_task' [-Wmissing-prototypes]
    6569 | void sched_set_stop_task(int cpu, struct task_struct *stop)
         |      ^~~~~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:7697:6: warning: no previous prototype for 'init_idle_bootup_task' [-Wmissing-prototypes]
    7697 | void init_idle_bootup_task(struct task_struct *idle)
         |      ^~~~~~~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:7721:20: warning: no previous prototype for 'sched_create_group' [-Wmissing-prototypes]
    7721 | struct task_group *sched_create_group(struct task_group *parent)
         |                    ^~~~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:7732:6: warning: no previous prototype for 'sched_online_group' [-Wmissing-prototypes]
    7732 | void sched_online_group(struct task_group *tg, struct task_group *parent)
         |      ^~~~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:7743:6: warning: no previous prototype for 'sched_destroy_group' [-Wmissing-prototypes]
    7743 | void sched_destroy_group(struct task_group *tg)
         |      ^~~~~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:7749:6: warning: no previous prototype for 'sched_offline_group' [-Wmissing-prototypes]
    7749 | void sched_offline_group(struct task_group *tg)
         |      ^~~~~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:7840:20: warning: initialized field overwritten [-Woverride-init]
    7840 |  .legacy_cftypes = cpu_legacy_files,
         |                    ^~~~~~~~~~~~~~~~
   kernel/sched/MuQSS.c:7840:20: note: (near initialization for 'cpu_cgrp_subsys.legacy_cftypes')


vim +/schedule_user +4407 kernel/sched/MuQSS.c

  4405	
  4406	#ifdef CONFIG_CONTEXT_TRACKING
> 4407	asmlinkage __visible void __sched schedule_user(void)
  4408	{
  4409		/*
  4410		 * If we come here after a random call to set_need_resched(),
  4411		 * or we have been woken up remotely but the IPI has not yet arrived,
  4412		 * we haven't yet exited the RCU idle mode. Do it here manually until
  4413		 * we find a better solution.
  4414		 *
  4415		 * NB: There are buggy callers of this function.  Ideally we
  4416		 * should warn if prev_state != IN_USER, but that will trigger
  4417		 * too frequently to make sense yet.
  4418		 */
  4419		enum ctx_state prev_state = exception_enter();
  4420		schedule();
  4421		exception_exit(prev_state);
  4422	}
  4423	#endif
  4424	

---
0-DAY CI Kernel Test Service, Intel Corporation
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