[PATCH V2] cxl: Add support for ASB_Notify on POWER9

[kbuild test robot]

Hi Christophe,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on v4.15-rc3 next-20171215]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Christophe-Lombard/cxl-Add-support-for-ASB_Notify-on-POWER9/20171204-135557
config: powerpc-currituck_defconfig (attached as .config)
compiler: powerpc-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

>> arch/powerpc/kernel/process.o:(___ksymtab_gpl+clear_thread_tidr+0x0): undefined reference to `clear_thread_tidr'
>> arch/powerpc/kernel/process.o:(___ksymtab_gpl+set_thread_tidr+0x0): undefined reference to `set_thread_tidr'

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0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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