ERROR: modpost: "rcu_idle_enter" undefined!

From: kernel test robot
Date: Sun Sep 20 2020 - 03:28:47 EST

tree: master
head: 325d0eab4f31c6240b59d5b2b8042c88f59405b5
commit: 1fecfdbb7acc6624655450a609221c89b5197a06 ACPI: processor: Take over RCU-idle for C3-BM idle
date: 4 days ago
config: ia64-defconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 1fecfdbb7acc6624655450a609221c89b5197a06
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "rcu_idle_enter" [drivers/acpi/processor.ko] undefined!
>> ERROR: modpost: "rcu_idle_exit" [drivers/acpi/processor.ko] undefined!

0-DAY CI Kernel Test Service, Intel Corporation

Attachment: .config.gz
Description: application/gzip