Re: [PATCH] wchan: Fix get_wchan() when task in schedule

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

Hi Chen,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on linus/master v6.3-rc4 next-20230330]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Chen-Zhongjin/wchan-Fix-get_wchan-when-task-in-schedule/20230330-201555
patch link:    https://lore.kernel.org/r/20230330121238.176534-1-chenzhongjin%40huawei.com
patch subject: [PATCH] wchan: Fix get_wchan() when task in schedule
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20230330/202303302125.7Ku9P7v5-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 12.1.0
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/intel-lab-lkp/linux/commit/d5fd727a071ab3c2241f858e77c2ae5bb3cec6f3
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Chen-Zhongjin/wchan-Fix-get_wchan-when-task-in-schedule/20230330-201555
        git checkout d5fd727a071ab3c2241f858e77c2ae5bb3cec6f3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash kernel/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303302125.7Ku9P7v5-lkp@intel.com/

All errors (new ones prefixed by >>):

   kernel/sched/core.c: In function 'get_wchan':
>> kernel/sched/core.c:2060:28: error: 'struct task_struct' has no member named 'on_cpu'
    2060 |             !p->on_rq && !p->on_cpu)
         |                            ^~


vim +2060 kernel/sched/core.c

  2046	
  2047	unsigned long get_wchan(struct task_struct *p)
  2048	{
  2049		unsigned long ip = 0;
  2050		unsigned int state;
  2051	
  2052		if (!p || p == current)
  2053			return 0;
  2054	
  2055		/* Only get wchan if task is blocked and we can keep it that way. */
  2056		raw_spin_lock_irq(&p->pi_lock);
  2057		state = READ_ONCE(p->__state);
  2058		smp_rmb(); /* see try_to_wake_up() */
  2059		if (state != TASK_RUNNING && state != TASK_WAKING &&
> 2060		    !p->on_rq && !p->on_cpu)
  2061			ip = __get_wchan(p);
  2062		raw_spin_unlock_irq(&p->pi_lock);
  2063	
  2064		return ip;
  2065	}
  2066	

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