3:22 p.m.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux.git tapi
head: 328004163c637a4505698baa71e5be0c3ee88d95
commit: d5677ae5c13a4a2304e494bc9252791831145c45 [16/30] taip: add wake up penalties
config: arm-randconfig-p001-20200822 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout d5677ae5c13a4a2304e494bc9252791831145c45
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
All errors (new ones prefixed by >>):
arm-linux-gnueabi-ld: net/core/dev.o: in function `find_ripe_napi':
> net/core/dev.c:6893: undefined reference to
`__aeabi_uldivmod'
arm-linux-gnueabi-ld: net/core/dev.c:6905: undefined
reference to `__aeabi_ldivmod'
#
https://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux.git/commit/?id...
git remote add kuba-linux https://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux.git
git fetch --no-tags kuba-linux tapi
git checkout d5677ae5c13a4a2304e494bc9252791831145c45
vim +6893 net/core/dev.c
6850
6851 static struct napi_struct *
6852 find_ripe_napi(struct net_device *dev, bool from_idle, s64 *to)
6853 {
6854 struct napi_struct *napi, *most_ripe = NULL;
6855 u64 oldest_poll = U64_MAX, sum = 0, cnt = 0;
6856 bool has_locals = false;
6857 u64 now;
6858
6859 *to = TAPI_BREAK_PREC_NS;
6860
6861 list_for_each_entry(napi, &dev->napi_list, dev_list) {
6862 u64 biased_time;
6863
6864 /* if TAPI_POLLING is set SCHED is never cleared */
6865 if (napi->state & (NAPIF_STATE_DISABLE |
6866 NAPIF_STATE_CLAIMED) ||
6867 !test_bit(NAPI_STATE_SCHED, &napi->state))
6868 continue;
6869
6870 cnt++;
6871 sum += napi->last_poll;
6872
6873 biased_time = napi->last_poll;
6874 if (napi->last_poll_thread == current) {
6875 biased_time -= TAPI_LOCAL_BIAS_TIME_NS;
6876 has_locals = true;
6877 }
6878
6879 if (biased_time >= oldest_poll)
6880 continue;
6881 oldest_poll = biased_time;
6882 most_ripe = napi;
6883 }
6884
6885 if (!most_ripe)
6886 return NULL;
6887
6888 now = ktime_get_ns();
6889 trace_napi_poller_select(most_ripe, now, from_idle);
6890
6891 if (TAPI_POLLING) {
6892 if (!has_locals && TAPI_WA_LATENCY_NS) {
6893 u64 avg_lat = now - sum / cnt;
6894
6895 trace_napi_poller_avg_lat(avg_lat);
6896 if (avg_lat < TAPI_WA_LATENCY_NS)
6897 return NULL;
6898 }
6899
6900 *to = oldest_poll
6901 + TAPI_LOCAL_BIAS_TIME_NS
6902 + TAPI_UNREADY_TIME_NS
6903 + from_idle * TAPI_IDLE_PENALTY_NS
6904 - now;
6905 *to /= 1000;
6906 if (*to > 0)
6907 return NULL;
6908 }
6909
6910 if (most_ripe->last_poll_thread == current)
6911 TAPI_CNT_LOCAL++;
6912 else
6913 TAPI_CNT_STEAL++;
6914
6915 return most_ripe;
6916 }
6917
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org