linux-kernel - [rcu:rcu/dev 14/15] kernel/time/tick-sched.c:820: undefined reference to `_

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Date:   Wed, 16 Aug 2017 13:19:41 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: [rcu:rcu/dev 14/15] kernel/time/tick-sched.c:820: undefined
 reference to `__divdi3'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev
head:   551164572a4a41968abd020ec24499085cc2adf7
commit: 33103e7b1f89ef432dfe3337d2a6932cdf5c1312 [14/15] EXP: Trace tick return from tick_nohz_stop_sched_tick
config: mips-nlm_xlr_defconfig (attached as .config)
compiler: mips-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 33103e7b1f89ef432dfe3337d2a6932cdf5c1312
        # save the attached .config to linux build tree
        make.cross ARCH=mips 

All errors (new ones prefixed by >>):

   kernel/time/tick-sched.o: In function `tick_nohz_stop_sched_tick':
>> kernel/time/tick-sched.c:820: undefined reference to `__divdi3'

vim +820 kernel/time/tick-sched.c

   758	
   759		/* Calculate the next expiry time */
   760		if (delta < (KTIME_MAX - basemono))
   761			expires = basemono + delta;
   762		else
   763			expires = KTIME_MAX;
   764	
   765		expires = min_t(u64, expires, next_tick);
   766		tick = expires;
   767	
   768		/* Skip reprogram of event if its not changed */
   769		if (ts->tick_stopped && (expires == ts->next_tick)) {
   770			/* Sanity check: make sure clockevent is actually programmed */
   771			if (tick == KTIME_MAX || ts->next_tick == hrtimer_get_expires(&ts->sched_timer))
   772				goto out;
   773	
   774			WARN_ON_ONCE(1);
   775			printk_once("basemono: %llu ts->next_tick: %llu dev->next_event: %llu timer->active: %d timer->expires: %llu\n",
   776				    basemono, ts->next_tick, dev->next_event,
   777				    hrtimer_active(&ts->sched_timer), hrtimer_get_expires(&ts->sched_timer));
   778		}
   779	
   780		/*
   781		 * nohz_stop_sched_tick can be called several times before
   782		 * the nohz_restart_sched_tick is called. This happens when
   783		 * interrupts arrive which do not cause a reschedule. In the
   784		 * first call we save the current tick time, so we can restart
   785		 * the scheduler tick in nohz_restart_sched_tick.
   786		 */
   787		if (!ts->tick_stopped) {
   788			calc_load_nohz_start();
   789			cpu_load_update_nohz_start();
   790	
   791			ts->last_tick = hrtimer_get_expires(&ts->sched_timer);
   792			ts->tick_stopped = 1;
   793			trace_tick_stop(1, TICK_DEP_MASK_NONE);
   794		}
   795	
   796		ts->next_tick = tick;
   797	
   798		/*
   799		 * If the expiration time == KTIME_MAX, then we simply stop
   800		 * the tick timer.
   801		 */
   802		if (unlikely(expires == KTIME_MAX)) {
   803			if (ts->nohz_mode == NOHZ_MODE_HIGHRES)
   804				hrtimer_cancel(&ts->sched_timer);
   805			goto out;
   806		}
   807	
   808		hrtimer_set_expires(&ts->sched_timer, tick);
   809	
   810		if (ts->nohz_mode == NOHZ_MODE_HIGHRES)
   811			hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS_PINNED);
   812		else
   813			tick_program_event(tick, 1);
   814	out:
   815		/*
   816		 * Update the estimated sleep length until the next timer
   817		 * (not only the tick).
   818		 */
   819		ts->sleep_length = ktime_sub(dev->next_event, now);
 > 820		trace_printk("tick_nohz_stop_sched_tick: %lld\n", (tick - ktime_get()) / 1000);
   821		return tick;
   822	}
   823	

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