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SubjectRe: [PATCH 6/6] psi: introduce psi monitor
Hi Suren,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.20-rc7]
[cannot apply to next-20181221]
[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/Suren-Baghdasaryan/psi-pressure-stall-monitors/20181215-181714
config: i386-randconfig-i2-12162314 (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/sched/psi.o: In function `psi_trigger_create':
>> kernel/sched/psi.c:1029: undefined reference to `__udivdi3'
kernel/sched/psi.o: In function `psi_trigger_destroy':
kernel/sched/psi.c:1057: undefined reference to `__udivdi3'

vim +1029 kernel/sched/psi.c

1006
1007 struct psi_trigger *psi_trigger_create(struct psi_group *group,
1008 enum psi_states state, u32 threshold_us, u32 win_sz_us)
1009 {
1010 struct psi_trigger *t;
1011
1012 if (static_branch_likely(&psi_disabled))
1013 return ERR_PTR(-EOPNOTSUPP);
1014
1015 t = kzalloc(sizeof(*t), GFP_KERNEL);
1016 if (!t)
1017 return ERR_PTR(-ENOMEM);
1018
1019 t->group = group;
1020 t->state = state;
1021 t->threshold = threshold_us * NSEC_PER_USEC;
1022 t->win.size = win_sz_us * NSEC_PER_USEC;
1023 t->event = 0;
1024 init_waitqueue_head(&t->event_wait);
1025
1026 mutex_lock(&group->update_lock);
1027
1028 list_add(&t->node, &group->triggers);
> 1029 group->trigger_min_period = min(group->trigger_min_period,
1030 t->win.size / PSI_TRIG_UPDATES_PER_WIN);
1031 group->nr_triggers[t->state]++;
1032 group->trigger_mask |= (1 << t->state);
1033
1034 mutex_unlock(&group->update_lock);
1035
1036 return t;
1037 }
1038

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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