Hi Kairui,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.20 next-20181224]
[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/Kairui-Song/x86-gart-kcore-Exclude-GART-aperture-from-kcore/20181221-132322
config: x86_64-randconfig-k2-12281339 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   arch/x86/kernel/aperture_64.o: In function `exclude_from_vmcore':
>> arch/x86/kernel/aperture_64.c:81: undefined reference to 
>> `register_mem_pfn_is_ram'

vim +81 arch/x86/kernel/aperture_64.c

    75  
    76  static void exclude_from_vmcore(u64 aper_base, u32 aper_order)
    77  {
    78          aperture_pfn_start = aper_base >> PAGE_SHIFT;
    79          aperture_page_count = (32 * 1024 * 1024) << aper_order >> 
PAGE_SHIFT;
    80          WARN_ON(register_oldmem_pfn_is_ram(&gart_mem_pfn_is_ram));
  > 81          WARN_ON(register_mem_pfn_is_ram(&gart_mem_pfn_is_ram));
    82  }
    83  #else
    84  static void exclude_from_vmcore(u64 aper_base, u32 aper_order)
    85  {
    86  }
    87  #endif
    88  

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

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