Hi,

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:   049ec1b5a76d34a6980cccdb7c0baeb4eed7a993
commit: 888cdbc2c9a76a0e450f533b1957cdbfe7d483d5 hugetlb: fix compile error on tile
date:   5 months ago
config: tile-allnoconfig (attached as .config)
compiler: tilegx-linux-gcc (GCC) 4.6.2
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 888cdbc2c9a76a0e450f533b1957cdbfe7d483d5
        # save the attached .config to linux build tree
        make.cross ARCH=tile 

All errors (new ones prefixed by >>):

   arch/tile/built-in.o: In function `setup_arch':
>> (.init.text+0x15d8): undefined reference to `early_panic'
   arch/tile/built-in.o: In function `setup_arch':
   (.init.text+0x1610): undefined reference to `early_panic'
   arch/tile/built-in.o: In function `setup_arch':
   (.init.text+0x1800): undefined reference to `early_panic'
   arch/tile/built-in.o: In function `setup_arch':
   (.init.text+0x1828): undefined reference to `early_panic'
   arch/tile/built-in.o: In function `setup_arch':
   (.init.text+0x1bd8): undefined reference to `early_panic'
   arch/tile/built-in.o:(.init.text+0x1c18): more undefined references to `early_panic' follow

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