linux-kernel - [ammarfaizi2-block:google/android/kernel/common/android13-5.15 21/2544] kernel/sched/core.c:2308:12: warning: no previous prototype for '__migrate

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Date:   Sat, 8 Jan 2022 02:06:24 +0800
From:   kernel test robot <lkp@...el.com>
To:     Stephen Dickey <quic_dickey@...cinc.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Todd Kjos <tkjos@...gle.com>
Subject: [ammarfaizi2-block:google/android/kernel/common/android13-5.15
 21/2544] kernel/sched/core.c:2308:12: warning: no previous prototype for
 '__migrate_task'

Hi Stephen,

FYI, the error/warning still remains.

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android13-5.15
head:   1d50adbe5ad4df334a576ab1d43c176306255e8a
commit: ca2177d4a03ddc4e6b64e54e0e7a176e282b4e18 [21/2544] ANDROID: sched: allow access to critical common code for CPU Pause
config: arc-randconfig-r043-20220107 (https://download.01.org/0day-ci/archive/20220108/202201080130.BU3Jp2mc-lkp@intel.com/config)
compiler: arceb-elf-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/ammarfaizi2/linux-block/commit/ca2177d4a03ddc4e6b64e54e0e7a176e282b4e18
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android13-5.15
        git checkout ca2177d4a03ddc4e6b64e54e0e7a176e282b4e18
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc 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:2308:12: warning: no previous prototype for '__migrate_task' [-Wmissing-prototypes]
    2308 | struct rq *__migrate_task(struct rq *rq, struct rq_flags *rf,
         |            ^~~~~~~~~~~~~~
   kernel/sched/core.c:3459:6: warning: no previous prototype for 'sched_set_stop_task' [-Wmissing-prototypes]
    3459 | void sched_set_stop_task(int cpu, struct task_struct *stop)
         |      ^~~~~~~~~~~~~~~~~~~


vim +/__migrate_task +2308 kernel/sched/core.c

  2298	
  2299	/*
  2300	 * Move (not current) task off this CPU, onto the destination CPU. We're doing
  2301	 * this because either it can't run here any more (set_cpus_allowed()
  2302	 * away from this CPU, or CPU going down), or because we're
  2303	 * attempting to rebalance this task on exec (sched_exec).
  2304	 *
  2305	 * So we race with normal scheduler movements, but that's OK, as long
  2306	 * as the task is no longer on this CPU.
  2307	 */
> 2308	struct rq *__migrate_task(struct rq *rq, struct rq_flags *rf,
  2309				  struct task_struct *p, int dest_cpu)
  2310	{
  2311		/* Affinity changed (again). */
  2312		if (!is_cpu_allowed(p, dest_cpu))
  2313			return rq;
  2314	
  2315		update_rq_clock(rq);
  2316		rq = move_queued_task(rq, rf, p, dest_cpu);
  2317	
  2318		return rq;
  2319	}
  2320	EXPORT_SYMBOL_GPL(__migrate_task);
  2321	

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