core.c:undefined reference to `fpu_save'

From	kbuild test robot <fengguang.wu@intel.com>
Newsgroups	linux.kernel
Subject	core.c:undefined reference to `fpu_save'
Date	2016-12-10 19:00 +0100
Message-ID	<sMU6d-5eP-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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:   810ac7b7558d7830e72d8dbf34b851fce39e08b0
commit: c60f169202c7643991a8b4bfeea60e06843d5b5a arch/mn10300/kernel/fpu-nofpu.c: needs asm/elf.h
date:   9 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'

---
0-DAY kernel test infrastructure                Open Source Technology Center
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core.c:undefined reference to `fpu_save' kbuild test robot <fengguang.wu@intel.com> - 2016-12-10 19:00 +0100

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