core.c:undefined reference to `fpu_save'

From: kbuild test robot
Date: Sat Jan 21 2017 - 22:58:01 EST


Hi Andrew,

It's probably a bug fix that unveils the link errors.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 4c9eff7af69c61749b9eb09141f18f35edbf2210
commit: c60f169202c7643991a8b4bfeea60e06843d5b5a arch/mn10300/kernel/fpu-nofpu.c: needs asm/elf.h
date: 10 months ago
config: mn10300-allnoconfig (attached as .config)
compiler: am33_2.0-linux-gcc (GCC) 6.2.0
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout c60f169202c7643991a8b4bfeea60e06843d5b5a
# save the attached .config to linux build tree
make.cross ARCH=mn10300

All errors (new ones prefixed by >>):

kernel/built-in.o: In function `.L410':
>> core.c:(.sched.text+0x28a): undefined reference to `fpu_save'

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