[kdave-btrfs-devel:dev/scrub-bw-sysfs 102/102] fs/btrfs/scrub.c:2001: undefined reference to `__udivdi3'

[kdave-btrfs-devel:dev/scrub-bw-sysfs 102/102] fs/btrfs/scrub.c:2001: undefined reference to `__udivdi3'

[kernel test robot]

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tree:   https://github.com/kdave/btrfs-devel.git dev/scrub-bw-sysfs
head:   1139caf65b8afe72e9037879d61882e5b142b772
commit: 1139caf65b8afe72e9037879d61882e5b142b772 [102/102] btrfs: WIP scrub bandwidth control
config: i386-randconfig-a002-20210205 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/kdave/btrfs-devel/commit/1139caf65b8afe72e9037879d61882e5b142b772
        git remote add kdave-btrfs-devel https://github.com/kdave/btrfs-devel.git
        git fetch --no-tags kdave-btrfs-devel dev/scrub-bw-sysfs
        git checkout 1139caf65b8afe72e9037879d61882e5b142b772
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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 >>):

   ld: fs/btrfs/scrub.o: in function `scrub_throttle':
>> fs/btrfs/scrub.c:2001: undefined reference to `__udivdi3'
>> ld: fs/btrfs/scrub.c:2017: undefined reference to `__divdi3'


vim +2001 fs/btrfs/scrub.c

  1966	
  1967	/*
  1968	 * Throttling of IO submission, bandwidth-limit based, the timeslice is 1
  1969	 * second.  Limit can be set via /sys/fs/UUID/devinfo/devid/scrub_speed_max.
  1970	 */
  1971	static void scrub_throttle(struct scrub_ctx *sctx)
  1972	{
  1973		const int time_slice = 1000;
  1974		struct scrub_bio *sbio;
  1975		struct btrfs_device *device;
  1976		s64 delta;
  1977		ktime_t now;
  1978		u32 div;
  1979		u64 bwlimit;
  1980	
  1981		sbio = sctx->bios[sctx->curr];
  1982		device = sbio->dev;
  1983		bwlimit = READ_ONCE(device->scrub_speed_max);
  1984		if (bwlimit == 0)
  1985			return;
  1986	
  1987		div = max_t(u32, 1, (u32)(bwlimit / (16 * 1024 * 1024)));
  1988		div = min_t(u32, 64, div);
  1989	
  1990		/* Start new epoch */
  1991		now = ktime_get();
  1992		if (sctx->throttle_deadline == 0) {
  1993			sctx->throttle_deadline = ktime_add_ms(now, time_slice / div);
  1994			sctx->throttle_sent = 0;
  1995		}
  1996	
  1997		/* Still in the time to send? */
  1998		if (ktime_before(now, sctx->throttle_deadline)) {
  1999			/* If current bio is within the limit, send it */
  2000			sctx->throttle_sent += sbio->bio->bi_iter.bi_size;
> 2001			if (sctx->throttle_sent <= bwlimit / div)
  2002				return;
  2003	
  2004			/* We're over the limit, sleep until the rest of the slice */
  2005			delta = ktime_ms_delta(sctx->throttle_deadline, now);
  2006		} else {
  2007			/* New request after deadline, start new epoch */
  2008			delta = 0;
  2009		}
  2010	#if 0
  2011		printk_ratelimited(KERN_INFO "THROT: inflight %d delta %lld div %u time_slice %d sent %lluk bw %lluk\n",
  2012			atomic_read(&sctx->bios_in_flight), delta, div, time_slice,
  2013			sctx->throttle_sent / SZ_1K,
  2014			bwlimit / SZ_1K);
  2015	#endif
  2016		if (delta)
> 2017			schedule_timeout_interruptible(delta * HZ / 1000);
  2018		/* Next call will start the deadline period */
  2019		sctx->throttle_deadline = 0;
  2020	}
  2021	

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

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