[jonmason-ntb:ntb-next 2/2] drivers/ntb/test/ntb_perf.c:1144: undefined reference to `__umoddi3'

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

tree:   https://github.com/jonmason/ntb ntb-next
head:   10003e852471b1214f4383d79592497b3f4c7b39
commit: 10003e852471b1214f4383d79592497b3f4c7b39 [2/2] ntb_perf: extend with burst/poll/doorbell latency measurement
config: i386-randconfig-c021-20220418 (https://download.01.org/0day-ci/archive/20220418/202204181358.WWjsittG-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-19) 11.2.0
reproduce (this is a W=1 build):
        # https://github.com/jonmason/ntb/commit/10003e852471b1214f4383d79592497b3f4c7b39
        git remote add jonmason-ntb https://github.com/jonmason/ntb
        git fetch --no-tags jonmason-ntb ntb-next
        git checkout 10003e852471b1214f4383d79592497b3f4c7b39
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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: drivers/ntb/test/ntb_perf.o: in function `perf_run_latency':
>> drivers/ntb/test/ntb_perf.c:1144: undefined reference to `__umoddi3'


vim +1144 drivers/ntb/test/ntb_perf.c

  1113	
  1114	static int perf_run_latency(struct perf_thread *pthr)
  1115	{
  1116		struct perf_peer *peer = pthr->perf->test_peer;
  1117		struct ntb_dev *ntb = pthr->perf->ntb;
  1118		void *flt_src;
  1119		void __iomem *flt_dst, *bnd_dst;
  1120		int ret;
  1121		u64 stop_at = ktime_get_real_fast_ns() + lat_time_ms * NSEC_PER_MSEC;
  1122	
  1123		pthr->tries = 0;
  1124		pthr->latency = ktime_get();
  1125		flt_src = pthr->src;
  1126		flt_dst = peer->outbuf;
  1127		bnd_dst = peer->outbuf + peer->outbuf_size;
  1128	
  1129		while (ktime_get_real_fast_ns() < stop_at) {
  1130			ret = perf_copy_chunk(pthr, flt_dst, flt_src, 1, false);
  1131			if (ret) {
  1132				dev_err(&ntb->dev, "%d: Latency testing error %d\n",
  1133					pthr->tidx, ret);
  1134				pthr->latency = ktime_set(0, 0);
  1135				return ret;
  1136			}
  1137	
  1138			pthr->tries++;
  1139			flt_dst++;
  1140			flt_src++;
  1141	
  1142			if (flt_dst >= bnd_dst || flt_dst < peer->outbuf) {
  1143				flt_dst = peer->outbuf;
> 1144				flt_src = pthr->src;
  1145			}
  1146	
  1147			/* Avoid processor soft lock-ups */
  1148			if (!(pthr->tries % RESCHEDULE_RATIO))
  1149				schedule();
  1150		}
  1151	
  1152		/* Stop timer */
  1153		pthr->latency = ktime_sub(ktime_get(), pthr->latency);
  1154	
  1155		if (pthr->tries < LAT_MIN_TRIES) {
  1156			dev_err(&ntb->dev, "%d: Too few steps to measure Latency. "
  1157					"Increase test time\n", pthr->tidx);
  1158			pthr->latency = ktime_set(0, 0);
  1159			return -EINVAL;
  1160		}
  1161	
  1162		dev_dbg(&ntb->dev, "%d: made %llu tries, lasted %llu usecs\n",
  1163			pthr->tidx, pthr->tries, ktime_to_us(pthr->latency));
  1164	
  1165		pthr->latency = ns_to_ktime(ktime_divns(pthr->latency, pthr->tries));
  1166	
  1167		dev_dbg(&ntb->dev, "%d: latency %llu us (%llu ns)\n", pthr->tidx,
  1168			ktime_to_us(pthr->latency), ktime_to_ns(pthr->latency));
  1169	
  1170		return 0;
  1171	}
  1172	

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