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Subject[norov:demotion-final 5/6] mm/mempolicy.c:3074: undefined reference to `set_demotion_target'
tree:   https://github.com/norov/linux demotion-final
head: f669201ff5142089471efbff9844cfc8b83522cc
commit: f2d905fe922bde5baddb485d6152a431b7954e50 [5/6] sysfs: add /sys/kernel/mm/numa/demotion_list
config: x86_64-randconfig-c022-20210812 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://github.com/norov/linux/commit/f2d905fe922bde5baddb485d6152a431b7954e50
git remote add norov https://github.com/norov/linux
git fetch --no-tags norov demotion-final
git checkout f2d905fe922bde5baddb485d6152a431b7954e50
# save the attached .config to linux build tree
mkdir build_dir
make W=1 O=build_dir ARCH=x86_64 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: mm/mempolicy.o: in function `numa_demotion_list_store':
>> mm/mempolicy.c:3074: undefined reference to `set_demotion_target'


vim +3074 mm/mempolicy.c

3050
3051 static ssize_t numa_demotion_list_store(struct kobject *kobj,
3052 struct kobj_attribute *attr,
3053 const char *buf, size_t count)
3054 {
3055 nodemask_t nodes;
3056 char *nodelist;
3057 int from, to, ret;
3058
3059 nodelist = strnchr(buf, count, '>');
3060 if (!nodelist)
3061 return -EINVAL;
3062
3063 *nodelist++ = 0;
3064
3065 ret = kstrtoint(buf, 0, &to);
3066 if (ret)
3067 return ret;
3068
3069 ret = nodelist_parse(nodelist, nodes);
3070 if (ret)
3071 return ret;
3072
3073 for_each_node_mask(from, nodes) {
> 3074 ret = set_demotion_target(from, to);
3075 if (ret == -EXDEV)
3076 pr_warn("Cross-node loop for demotion: %d>%d\n", to, from);
3077 else if (ret)
3078 return ret;
3079 }
3080
3081 return count;
3082 }
3083

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