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Date: Mon, 21 Feb 2022 07:37:16 +0800
From: kernel test robot <lkp@...el.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org
Subject: [mingo-tip:sched/headers 1782/2574] kernel/sched/core.c:9009:6:
warning: no previous prototype for function 'idle_task_exit'
tree: git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head: 39e8a0edc8fae20758051dadf7846849edc18b88
commit: b6902652b0ca92c05ba2a78dafaa1db83f232fe4 [1782/2574] headers/deps: Reorganize, clean up and optimize kernel/sched/sched.h dependencies
config: x86_64-randconfig-a003 (https://download.01.org/0day-ci/archive/20220221/202202210715.pKdyhau2-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
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://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=b6902652b0ca92c05ba2a78dafaa1db83f232fe4
git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
git fetch --no-tags mingo-tip sched/headers
git checkout b6902652b0ca92c05ba2a78dafaa1db83f232fe4
# save the config file 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 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/core.c:3645:6: warning: no previous prototype for function 'sched_set_stop_task' [-Wmissing-prototypes]
void sched_set_stop_task(int cpu, struct task_struct *stop)
^
kernel/sched/core.c:3645:1: 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:5345:20: warning: no previous prototype for function 'task_sched_runtime' [-Wmissing-prototypes]
unsigned long long task_sched_runtime(struct task_struct *p)
^
kernel/sched/core.c:5345:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
unsigned long long task_sched_runtime(struct task_struct *p)
^
static
>> kernel/sched/core.c:9009:6: warning: no previous prototype for function 'idle_task_exit' [-Wmissing-prototypes]
void idle_task_exit(void)
^
kernel/sched/core.c:9009:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void idle_task_exit(void)
^
static
>> kernel/sched/core.c:9242:5: warning: no previous prototype for function 'sched_cpu_activate' [-Wmissing-prototypes]
int sched_cpu_activate(unsigned int cpu)
^
kernel/sched/core.c:9242:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int sched_cpu_activate(unsigned int cpu)
^
static
>> kernel/sched/core.c:9286:5: warning: no previous prototype for function 'sched_cpu_deactivate' [-Wmissing-prototypes]
int sched_cpu_deactivate(unsigned int cpu)
^
kernel/sched/core.c:9286:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int sched_cpu_deactivate(unsigned int cpu)
^
static
>> kernel/sched/core.c:9359:5: warning: no previous prototype for function 'sched_cpu_starting' [-Wmissing-prototypes]
int sched_cpu_starting(unsigned int cpu)
^
kernel/sched/core.c:9359:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int sched_cpu_starting(unsigned int cpu)
^
static
>> kernel/sched/core.c:9380:5: warning: no previous prototype for function 'sched_cpu_wait_empty' [-Wmissing-prototypes]
int sched_cpu_wait_empty(unsigned int cpu)
^
kernel/sched/core.c:9380:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int sched_cpu_wait_empty(unsigned int cpu)
^
static
>> kernel/sched/core.c:9422:5: warning: no previous prototype for function 'sched_cpu_dying' [-Wmissing-prototypes]
int sched_cpu_dying(unsigned int cpu)
^
kernel/sched/core.c:9422:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int sched_cpu_dying(unsigned int cpu)
^
static
kernel/sched/core.c:9445:13: warning: no previous prototype for function 'sched_init_smp' [-Wmissing-prototypes]
void __init sched_init_smp(void)
^
kernel/sched/core.c:9445:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void __init sched_init_smp(void)
^
static
kernel/sched/core.c:9508:13: warning: no previous prototype for function 'per_task_init' [-Wmissing-prototypes]
void __init per_task_init(void)
^
kernel/sched/core.c:9508:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void __init per_task_init(void)
^
static
kernel/sched/core.c:9517:13: warning: no previous prototype for function 'sched_init' [-Wmissing-prototypes]
void __init sched_init(void)
^
kernel/sched/core.c:9517:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void __init sched_init(void)
^
static
kernel/sched/core.c:1852:1: warning: unused function 'uclamp_update_active' [-Wunused-function]
uclamp_update_active(struct task_struct *p)
^
12 warnings generated.
vim +/idle_task_exit +9009 kernel/sched/core.c
^1da177e4c3f41 kernel/sched.c Linus Torvalds 2005-04-16 9003
^1da177e4c3f41 kernel/sched.c Linus Torvalds 2005-04-16 9004 #ifdef CONFIG_HOTPLUG_CPU
054b9108e01ef2 kernel/sched.c Kirill Korotaev 2006-12-10 9005 /*
d1ccc66df8bfe3 kernel/sched/core.c Ingo Molnar 2017-02-01 9006 * Ensure that the idle task is using init_mm right before its CPU goes
48c5ccae88dcd9 kernel/sched.c Peter Zijlstra 2010-11-13 9007 * offline.
054b9108e01ef2 kernel/sched.c Kirill Korotaev 2006-12-10 9008 */
48c5ccae88dcd9 kernel/sched.c Peter Zijlstra 2010-11-13 @9009 void idle_task_exit(void)
^1da177e4c3f41 kernel/sched.c Linus Torvalds 2005-04-16 9010 {
48c5ccae88dcd9 kernel/sched.c Peter Zijlstra 2010-11-13 9011 struct mm_struct *mm = current->active_mm;
^1da177e4c3f41 kernel/sched.c Linus Torvalds 2005-04-16 9012
48c5ccae88dcd9 kernel/sched.c Peter Zijlstra 2010-11-13 9013 BUG_ON(cpu_online(smp_processor_id()));
bf2c59fce4074e kernel/sched/core.c Peter Zijlstra 2020-04-01 9014 BUG_ON(current != this_rq()->idle);
e76bd8d9850c22 kernel/sched.c Rusty Russell 2008-11-25 9015
a53efe5ff88d02 kernel/sched/core.c Martin Schwidefsky 2012-10-26 9016 if (mm != &init_mm) {
252d2a4117bc18 kernel/sched/core.c Andy Lutomirski 2017-06-09 9017 switch_mm(mm, &init_mm, current);
a53efe5ff88d02 kernel/sched/core.c Martin Schwidefsky 2012-10-26 9018 finish_arch_post_lock_switch();
a53efe5ff88d02 kernel/sched/core.c Martin Schwidefsky 2012-10-26 9019 }
bf2c59fce4074e kernel/sched/core.c Peter Zijlstra 2020-04-01 9020
bf2c59fce4074e kernel/sched/core.c Peter Zijlstra 2020-04-01 9021 /* finish_cpu(), as ran on the BP, will clean up the active_mm state */
^1da177e4c3f41 kernel/sched.c Linus Torvalds 2005-04-16 9022 }
^1da177e4c3f41 kernel/sched.c Linus Torvalds 2005-04-16 9023
:::::: The code at line 9009 was first introduced by commit
:::::: 48c5ccae88dcd989d9de507e8510313c6cbd352b sched: Simplify cpu-hot-unplug task migration
:::::: TO: Peter Zijlstra <a.p.zijlstra@...llo.nl>
:::::: CC: Ingo Molnar <mingo@...e.hu>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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