Hi Hans,

I love your patch! Yet something to improve:

[auto build test ERROR on tip/x86/core]
[also build test ERROR on v5.6-rc5 next-20200311]
[cannot apply to tip/auto-latest bp/for-next]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Hans-de-Goede/x86-purgatory-Make-sure-we-fail-the-build-if-purgatory-ro-has-missing-symbols/20200312-070856
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 248ed51048c40d36728e70914e38bffd7821da57
config: x86_64-randconfig-s0-20200312 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-5) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   ld: arch/x86/purgatory/purgatory.ro: in function `_GLOBAL__sub_I_00100_0_purgatory':
>> purgatory.c:(.text.startup+0xc): undefined reference to `__gcov_init'
   ld: arch/x86/purgatory/purgatory.ro: in function `_GLOBAL__sub_I_00100_0_sha256_update':
>> sha256.c:(.text.startup+0x2c): undefined reference to `__gcov_init'
   ld: arch/x86/purgatory/purgatory.ro: in function `_GLOBAL__sub_I_00100_0_memcmp':
>> string.c:(.text.startup+0x4c): undefined reference to `__gcov_init'
   ld: arch/x86/purgatory/purgatory.ro: in function `_GLOBAL__sub_D_00100_1_purgatory':
>> purgatory.c:(.text.exit+0x2): undefined reference to `__gcov_exit'
   ld: arch/x86/purgatory/purgatory.ro: in function `_GLOBAL__sub_D_00100_1_sha256_update':
>> sha256.c:(.text.exit+0x12): undefined reference to `__gcov_exit'
   ld: arch/x86/purgatory/purgatory.ro: in function `_GLOBAL__sub_D_00100_1_memcmp':
>> string.c:(.text.exit+0x22): undefined reference to `__gcov_exit'
>> ld: arch/x86/purgatory/purgatory.ro:(.data+0xc0): undefined reference to `__gcov_merge_add'
   ld: arch/x86/purgatory/purgatory.ro:(.data+0x21e0): undefined reference to `__gcov_merge_add'
   ld: arch/x86/purgatory/purgatory.ro:(.data+0x2780): undefined reference to `__gcov_merge_add'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org