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SubjectRe: [PATCH v4 3/3] mm: fix double page fault on arm64 if PTE_AF is cleared
Hi Jia,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3 next-20190917]
[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/Jia-He/fix-double-page-fault-on-arm64/20190918-220036
config: arm64-allnoconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 7.4.0
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
GCC_VERSION=7.4.0 make.cross ARCH=arm64

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

All errors (new ones prefixed by >>):

mm/memory.o: In function `wp_page_copy':
>> memory.c:(.text+0x8fc): undefined reference to `cpu_has_hw_af'
memory.c:(.text+0x8fc): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `cpu_has_hw_af'

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[unhandled content-type:application/gzip]
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