linux-kernel - [ammarfaizi2-block:google/android/kernel/common/android12-5.10 2257/9999] kernel/sched/fair.c:4424:6: warning: no previous prototype for 'set_next

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Date:   Thu, 10 Mar 2022 16:14:11 +0800
From:   kernel test robot <lkp@...el.com>
To:     lijianzhong <lijianzhong@...omi.com>
Cc:     kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org, Todd Kjos <tkjos@...gle.com>
Subject: [ammarfaizi2-block:google/android/kernel/common/android12-5.10
 2257/9999] kernel/sched/fair.c:4424:6: warning: no previous prototype for
 'set_next_entity'

Hi lijianzhong,

FYI, the error/warning still remains.

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android12-5.10
head:   786bcb11099e8926ac5b5270de844d01c394ab89
commit: 54f66141a8834e27601fe594d68a97db01bb86b6 [2257/9999] ANDROID: sched: Add vendor hooks for sched.
config: i386-tinyconfig (https://download.01.org/0day-ci/archive/20220310/202203101619.QCheEDyN-lkp@intel.com/config)
compiler: gcc-9 (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/54f66141a8834e27601fe594d68a97db01bb86b6
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android12-5.10
        git checkout 54f66141a8834e27601fe594d68a97db01bb86b6
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash kernel/printk/ kernel/sched/

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

All warnings (new ones prefixed by >>):

>> kernel/sched/fair.c:4424:6: warning: no previous prototype for 'set_next_entity' [-Wmissing-prototypes]
    4424 | void set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
         |      ^~~~~~~~~~~~~~~
   kernel/sched/fair.c:5408:6: warning: no previous prototype for 'init_cfs_bandwidth' [-Wmissing-prototypes]
    5408 | void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
         |      ^~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c:11341:6: warning: no previous prototype for 'free_fair_sched_group' [-Wmissing-prototypes]
   11341 | void free_fair_sched_group(struct task_group *tg) { }
         |      ^~~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c:11343:5: warning: no previous prototype for 'alloc_fair_sched_group' [-Wmissing-prototypes]
   11343 | int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
         |     ^~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c:11348:6: warning: no previous prototype for 'online_fair_sched_group' [-Wmissing-prototypes]
   11348 | void online_fair_sched_group(struct task_group *tg) { }
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c:11350:6: warning: no previous prototype for 'unregister_fair_sched_group' [-Wmissing-prototypes]
   11350 | void unregister_fair_sched_group(struct task_group *tg) { }
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/set_next_entity +4424 kernel/sched/fair.c

  4423	
> 4424	void set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
  4425	{
  4426		/* 'current' is not kept within the tree. */
  4427		if (se->on_rq) {
  4428			/*
  4429			 * Any task has to be enqueued before it get to execute on
  4430			 * a CPU. So account for the time it spent waiting on the
  4431			 * runqueue.
  4432			 */
  4433			update_stats_wait_end(cfs_rq, se);
  4434			__dequeue_entity(cfs_rq, se);
  4435			update_load_avg(cfs_rq, se, UPDATE_TG);
  4436		}
  4437	
  4438		update_stats_curr_start(cfs_rq, se);
  4439		cfs_rq->curr = se;
  4440	
  4441		/*
  4442		 * Track our maximum slice length, if the CPU's load is at
  4443		 * least twice that of our own weight (i.e. dont track it
  4444		 * when there are only lesser-weight tasks around):
  4445		 */
  4446		if (schedstat_enabled() &&
  4447		    rq_of(cfs_rq)->cfs.load.weight >= 2*se->load.weight) {
  4448			schedstat_set(se->statistics.slice_max,
  4449				max((u64)schedstat_val(se->statistics.slice_max),
  4450				    se->sum_exec_runtime - se->prev_sum_exec_runtime));
  4451		}
  4452	
  4453		se->prev_sum_exec_runtime = se->sum_exec_runtime;
  4454	}
  4455	EXPORT_SYMBOL_GPL(set_next_entity);
  4456	
  4457	

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