linux-kernel - Re: [PATCH] freezer: fix freeze timeout on exec

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Date:   Sun, 11 Nov 2018 17:51:22 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Chanho Min <chanho.min@....com>
Cc:     kbuild-all@...org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Christian Brauner <christian@...uner.io>,
        Oleg Nesterov <oleg@...hat.com>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Seungho Park <seungho1.park@....com>,
        Chanho Min <chanho.min@....com>
Subject: Re: [PATCH] freezer: fix freeze timeout on exec

Hi Chanho,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.20-rc1 next-20181109]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Chanho-Min/freezer-fix-freeze-timeout-on-exec/20181111-171200
config: i386-randconfig-x002-201845 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   kernel/signal.c: In function 'zap_other_threads':
>> kernel/signal.c:1283:3: error: implicit declaration of function 'cancel_freezing_thaw_task' [-Werror=implicit-function-declaration]
      cancel_freezing_thaw_task(t);
      ^~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/cancel_freezing_thaw_task +1283 kernel/signal.c

  1260	
  1261	/*
  1262	 * Nuke all other threads in the group.
  1263	 */
  1264	int zap_other_threads(struct task_struct *p)
  1265	{
  1266		struct task_struct *t = p;
  1267		int count = 0;
  1268	
  1269		p->signal->group_stop_count = 0;
  1270	
  1271		while_each_thread(p, t) {
  1272			task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK);
  1273			count++;
  1274	
  1275			/* Don't bother with already dead threads */
  1276			if (t->exit_state)
  1277				continue;
  1278	
  1279			/*
  1280			 * we can check sig->group_exit_task to detect de_thread,
  1281			 * but perhaps it doesn't hurt if the caller is do_group_exit
  1282			 */
> 1283			cancel_freezing_thaw_task(t);
  1284			sigaddset(&t->pending.signal, SIGKILL);
  1285			signal_wake_up(t, 1);
  1286		}
  1287	
  1288		return count;
  1289	}
  1290	

---
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