Re: [PATCH resend] hung_task: add task->flags, blocked by coredump to log

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

Hi Oxana,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on tip/sched/core brauner-vfs/vfs.all linus/master v6.13-rc6 next-20250110]
[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/Oxana-Kharitonova/hung_task-add-task-flags-blocked-by-coredump-to-log/20250111-000505
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250110160328.64947-1-oxana%40cloudflare.com
patch subject: [PATCH resend] hung_task: add task->flags, blocked by coredump to log
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20250111/202501111752.UjvzAplN-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250111/202501111752.UjvzAplN-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202501111752.UjvzAplN-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/sched/core.c:7706:9: warning: format specifies type 'unsigned long' but the argument has type 'unsigned int' [-Wformat]
    7704 |         pr_cont(" stack:%-5lu pid:%-5d tgid:%-5d ppid:%-6d task_flags:0x%08lx flags:0x%08lx\n",
         |                                                                         ~~~~~
         |                                                                         %08x
    7705 |                 free, task_pid_nr(p), task_tgid_nr(p),
    7706 |                 ppid, p->flags, read_task_thread_flags(p));
         |                       ^~~~~~~~
   include/linux/printk.h:586:26: note: expanded from macro 'pr_cont'
     586 |         printk(KERN_CONT fmt, ##__VA_ARGS__)
         |                          ~~~    ^~~~~~~~~~~
   include/linux/printk.h:501:60: note: expanded from macro 'printk'
     501 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
         |                                                     ~~~    ^~~~~~~~~~~
   include/linux/printk.h:473:19: note: expanded from macro 'printk_index_wrap'
     473 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ~~~~    ^~~~~~~~~~~
   kernel/sched/core.c:3642:20: warning: unused function 'rq_has_pinned_tasks' [-Wunused-function]
    3642 | static inline bool rq_has_pinned_tasks(struct rq *rq)
         |                    ^~~~~~~~~~~~~~~~~~~
   kernel/sched/core.c:5816:20: warning: unused function 'sched_tick_start' [-Wunused-function]
    5816 | static inline void sched_tick_start(int cpu) { }
         |                    ^~~~~~~~~~~~~~~~
   kernel/sched/core.c:5817:20: warning: unused function 'sched_tick_stop' [-Wunused-function]
    5817 | static inline void sched_tick_stop(int cpu) { }
         |                    ^~~~~~~~~~~~~~~
   kernel/sched/core.c:6535:20: warning: unused function 'sched_core_cpu_starting' [-Wunused-function]
    6535 | static inline void sched_core_cpu_starting(unsigned int cpu) {}
         |                    ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/core.c:6536:20: warning: unused function 'sched_core_cpu_deactivate' [-Wunused-function]
    6536 | static inline void sched_core_cpu_deactivate(unsigned int cpu) {}
         |                    ^~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/core.c:6537:20: warning: unused function 'sched_core_cpu_dying' [-Wunused-function]
    6537 | static inline void sched_core_cpu_dying(unsigned int cpu) {}
         |                    ^~~~~~~~~~~~~~~~~~~~
   7 warnings generated.


vim +7706 kernel/sched/core.c

  7685	
  7686	void sched_show_task(struct task_struct *p)
  7687	{
  7688		unsigned long free;
  7689		int ppid;
  7690	
  7691		if (!try_get_task_stack(p))
  7692			return;
  7693	
  7694		pr_info("task:%-15.15s state:%c", p->comm, task_state_to_char(p));
  7695	
  7696		if (task_is_running(p))
  7697			pr_cont("  running task    ");
  7698		free = stack_not_used(p);
  7699		ppid = 0;
  7700		rcu_read_lock();
  7701		if (pid_alive(p))
  7702			ppid = task_pid_nr(rcu_dereference(p->real_parent));
  7703		rcu_read_unlock();
  7704		pr_cont(" stack:%-5lu pid:%-5d tgid:%-5d ppid:%-6d task_flags:0x%08lx flags:0x%08lx\n",
  7705			free, task_pid_nr(p), task_tgid_nr(p),
> 7706			ppid, p->flags, read_task_thread_flags(p));
  7707	
  7708		print_worker_info(KERN_INFO, p);
  7709		print_stop_info(KERN_INFO, p);
  7710		print_scx_info(KERN_INFO, p);
  7711		show_stack(p, NULL, KERN_INFO);
  7712		put_task_stack(p);
  7713	}
  7714	EXPORT_SYMBOL_GPL(sched_show_task);
  7715	

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