Re: [PATCH] kernel/sched/core: Print the time when the process entered the D state

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

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Hi zhouchuangao,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on tip/master linux/master linus/master v5.13 next-20210709]
[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]

url:    https://github.com/0day-ci/linux/commits/zhouchuangao/kernel-sched-core-Print-the-time-when-the-process-entered-the-D-state/20210709-130636
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 031e3bd8986fffe31e1ddbf5264cccfe30c9abd7
config: i386-tinyconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/287f10f679a0c30c4ac57abb8a36e698619554d5
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review zhouchuangao/kernel-sched-core-Print-the-time-when-the-process-entered-the-D-state/20210709-130636
        git checkout 287f10f679a0c30c4ac57abb8a36e698619554d5
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash kernel/sched/

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

All errors (new ones prefixed by >>):

   kernel/sched/core.c: In function 'ttwu_stat':
   kernel/sched/core.c:3267:13: warning: variable 'rq' set but not used [-Wunused-but-set-variable]
    3267 |  struct rq *rq;
         |             ^~
   In file included from include/linux/kernel.h:17,
                    from arch/x86/include/asm/percpu.h:27,
                    from arch/x86/include/asm/current.h:6,
                    from include/linux/sched.h:12,
                    from include/linux/kthread.h:6,
                    from include/trace/events/sched.h:8,
                    from kernel/sched/core.c:10:
   kernel/sched/core.c: In function 'sched_show_task':
>> kernel/sched/core.c:8158:16: error: 'struct sched_info' has no member named 'last_arrival'
    8158 |   p->sched_info.last_arrival);
         |                ^
   include/linux/printk.h:385:26: note: in definition of macro 'pr_cont'
     385 |  printk(KERN_CONT fmt, ##__VA_ARGS__)
         |                          ^~~~~~~~~~~


vim +8158 kernel/sched/core.c

  8134	
  8135	void sched_show_task(struct task_struct *p)
  8136	{
  8137		unsigned long free = 0;
  8138		int ppid;
  8139	
  8140		if (!try_get_task_stack(p))
  8141			return;
  8142	
  8143		pr_info("task:%-15.15s state:%c", p->comm, task_state_to_char(p));
  8144	
  8145		if (task_is_running(p))
  8146			pr_cont("  running task    ");
  8147	#ifdef CONFIG_DEBUG_STACK_USAGE
  8148		free = stack_not_used(p);
  8149	#endif
  8150		ppid = 0;
  8151		rcu_read_lock();
  8152		if (pid_alive(p))
  8153			ppid = task_pid_nr(rcu_dereference(p->real_parent));
  8154		rcu_read_unlock();
  8155		pr_cont(" stack:%5lu pid:%5d ppid:%6d flags:0x%08lx sched:%llu\n",
  8156			free, task_pid_nr(p), ppid,
  8157			(unsigned long)task_thread_info(p)->flags,
> 8158			p->sched_info.last_arrival);
  8159	
  8160		print_worker_info(KERN_INFO, p);
  8161		print_stop_info(KERN_INFO, p);
  8162		show_stack(p, NULL, KERN_INFO);
  8163		put_task_stack(p);
  8164	}
  8165	EXPORT_SYMBOL_GPL(sched_show_task);
  8166	

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

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