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Date: Fri, 14 Jan 2022 02:55:15 +0800
From: kernel test robot <lkp@...el.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [mingo-tip:master 1793/2382] kernel/sched/fair.c:10758:6: warning:
no previous prototype for 'nohz_balance_enter_idle'
tree: git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git master
head: 1a880941a087613ed42f77001229edfcf75ea8a5
commit: 90af8efc5f313f5faa40d7e7bc58986a4342828a [1793/2382] headers/deps: Reorganize, clean up and optimize kernel/sched/sched.h dependencies
config: x86_64-randconfig-a011 (https://download.01.org/0day-ci/archive/20220114/202201140251.J3IHIgTm-lkp@intel.com/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/mingo/tip.git/commit/?id=90af8efc5f313f5faa40d7e7bc58986a4342828a
git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
git fetch --no-tags mingo-tip master
git checkout 90af8efc5f313f5faa40d7e7bc58986a4342828a
# save the config file to linux build tree
mkdir build_dir
make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash 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:5486:6: warning: no previous prototype for 'init_cfs_bandwidth' [-Wmissing-prototypes]
5486 | void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
| ^~~~~~~~~~~~~~~~~~
>> kernel/sched/fair.c:10758:6: warning: no previous prototype for 'nohz_balance_enter_idle' [-Wmissing-prototypes]
10758 | void nohz_balance_enter_idle(int cpu)
| ^~~~~~~~~~~~~~~~~~~~~~~
kernel/sched/fair.c:11880:6: warning: no previous prototype for 'free_fair_sched_group' [-Wmissing-prototypes]
11880 | void free_fair_sched_group(struct task_group *tg) { }
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/fair.c:11882:5: warning: no previous prototype for 'alloc_fair_sched_group' [-Wmissing-prototypes]
11882 | int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
| ^~~~~~~~~~~~~~~~~~~~~~
kernel/sched/fair.c:11887:6: warning: no previous prototype for 'online_fair_sched_group' [-Wmissing-prototypes]
11887 | void online_fair_sched_group(struct task_group *tg) { }
| ^~~~~~~~~~~~~~~~~~~~~~~
kernel/sched/fair.c:11889:6: warning: no previous prototype for 'unregister_fair_sched_group' [-Wmissing-prototypes]
11889 | void unregister_fair_sched_group(struct task_group *tg) { }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/nohz_balance_enter_idle +10758 kernel/sched/fair.c
69e1e811dcc436 kernel/sched/fair.c Suresh Siddha 2011-12-01 10753
1e3c88bdeb1260 kernel/sched_fair.c Peter Zijlstra 2009-12-17 10754 /*
97fb7a0a8944bd kernel/sched/fair.c Ingo Molnar 2018-03-03 10755 * This routine will record that the CPU is going idle with tick stopped.
0b005cf54eac17 kernel/sched/fair.c Suresh Siddha 2011-12-01 10756 * This info will be used in performing idle load balancing in the future.
1e3c88bdeb1260 kernel/sched_fair.c Peter Zijlstra 2009-12-17 10757 */
c1cc017c59c44d kernel/sched/fair.c Alex Shi 2012-09-10 @10758 void nohz_balance_enter_idle(int cpu)
1e3c88bdeb1260 kernel/sched_fair.c Peter Zijlstra 2009-12-17 10759 {
00357f5ec5d67a kernel/sched/fair.c Peter Zijlstra 2017-12-21 10760 struct rq *rq = cpu_rq(cpu);
00357f5ec5d67a kernel/sched/fair.c Peter Zijlstra 2017-12-21 10761
00357f5ec5d67a kernel/sched/fair.c Peter Zijlstra 2017-12-21 10762 SCHED_WARN_ON(cpu != smp_processor_id());
00357f5ec5d67a kernel/sched/fair.c Peter Zijlstra 2017-12-21 10763
97fb7a0a8944bd kernel/sched/fair.c Ingo Molnar 2018-03-03 10764 /* If this CPU is going down, then nothing needs to be done: */
71325960d16cd6 kernel/sched/fair.c Suresh Siddha 2012-01-19 10765 if (!cpu_active(cpu))
71325960d16cd6 kernel/sched/fair.c Suresh Siddha 2012-01-19 10766 return;
71325960d16cd6 kernel/sched/fair.c Suresh Siddha 2012-01-19 10767
387bc8b5536eeb kernel/sched/fair.c Frederic Weisbecker 2017-06-19 10768 /* Spare idle load balancing on CPUs that don't want to be disturbed: */
de201559df872f kernel/sched/fair.c Frederic Weisbecker 2017-10-27 10769 if (!housekeeping_cpu(cpu, HK_FLAG_SCHED))
387bc8b5536eeb kernel/sched/fair.c Frederic Weisbecker 2017-06-19 10770 return;
387bc8b5536eeb kernel/sched/fair.c Frederic Weisbecker 2017-06-19 10771
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10772 /*
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10773 * Can be set safely without rq->lock held
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10774 * If a clear happens, it will have evaluated last additions because
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10775 * rq->lock is held during the check and the clear
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10776 */
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10777 rq->has_blocked_load = 1;
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10778
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10779 /*
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10780 * The tick is still stopped but load could have been added in the
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10781 * meantime. We set the nohz.has_blocked flag to trig a check of the
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10782 * *_avg. The CPU is already part of nohz.idle_cpus_mask so the clear
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10783 * of nohz.has_blocked can only happen after checking the new load
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10784 */
00357f5ec5d67a kernel/sched/fair.c Peter Zijlstra 2017-12-21 10785 if (rq->nohz_tick_stopped)
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10786 goto out;
1e3c88bdeb1260 kernel/sched_fair.c Peter Zijlstra 2009-12-17 10787
97fb7a0a8944bd kernel/sched/fair.c Ingo Molnar 2018-03-03 10788 /* If we're a completely isolated CPU, we don't play: */
00357f5ec5d67a kernel/sched/fair.c Peter Zijlstra 2017-12-21 10789 if (on_null_domain(rq))
d987fc7f3228bf kernel/sched/fair.c Mike Galbraith 2011-12-05 10790 return;
d987fc7f3228bf kernel/sched/fair.c Mike Galbraith 2011-12-05 10791
00357f5ec5d67a kernel/sched/fair.c Peter Zijlstra 2017-12-21 10792 rq->nohz_tick_stopped = 1;
00357f5ec5d67a kernel/sched/fair.c Peter Zijlstra 2017-12-21 10793
83cd4fe27ad844 kernel/sched_fair.c Venkatesh Pallipadi 2010-05-21 10794 cpumask_set_cpu(cpu, nohz.idle_cpus_mask);
0b005cf54eac17 kernel/sched/fair.c Suresh Siddha 2011-12-01 10795 atomic_inc(&nohz.nr_cpus);
00357f5ec5d67a kernel/sched/fair.c Peter Zijlstra 2017-12-21 10796
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10797 /*
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10798 * Ensures that if nohz_idle_balance() fails to observe our
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10799 * @idle_cpus_mask store, it must observe the @has_blocked
7fd7a9e0caba10 kernel/sched/fair.c Valentin Schneider 2021-08-23 10800 * and @needs_update stores.
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10801 */
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10802 smp_mb__after_atomic();
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10803
00357f5ec5d67a kernel/sched/fair.c Peter Zijlstra 2017-12-21 10804 set_cpu_sd_state_idle(cpu);
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10805
7fd7a9e0caba10 kernel/sched/fair.c Valentin Schneider 2021-08-23 10806 WRITE_ONCE(nohz.needs_update, 1);
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10807 out:
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10808 /*
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10809 * Each time a cpu enter idle, we assume that it has blocked load and
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10810 * enable the periodic update of the load of idle cpus
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10811 */
f643ea2207010d kernel/sched/fair.c Vincent Guittot 2018-02-13 10812 WRITE_ONCE(nohz.has_blocked, 1);
1e3c88bdeb1260 kernel/sched_fair.c Peter Zijlstra 2009-12-17 10813 }
1e3c88bdeb1260 kernel/sched_fair.c Peter Zijlstra 2009-12-17 10814
:::::: The code at line 10758 was first introduced by commit
:::::: c1cc017c59c44d9ede7003631c43adc0cfdce2f9 sched/nohz: Clean up select_nohz_load_balancer()
:::::: TO: Alex Shi <alex.shi@...el.com>
:::::: CC: Ingo Molnar <mingo@...nel.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
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