[PATCH v2] mm: introduce reference pages

[kernel test robot]

Hi Peter,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[cannot apply to mmotm/master hnaz-linux-mm/master arm64/for-next/core tip/x86/asm v5.8 next-20200813]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Peter-Collingbourne/mm-introduce-reference-pages/20200814-061235
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git dddcbc139e96bd18d8c65ef7b7e440f0d32457c2
config: s390-allyesconfig (attached as .config)
compiler: s390-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        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
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

   In file included from arch/s390/include/uapi/asm/unistd.h:14,
                    from arch/s390/include/asm/unistd.h:10,
                    from arch/s390/kernel/compat_audit.c:3:
>> ./arch/s390/include/generated/uapi/asm/unistd_32.h:415: warning: "__NR_faccessat2" redefined
     415 | #define __NR_faccessat2 440
         | 
   ./arch/s390/include/generated/uapi/asm/unistd_32.h:414: note: this is the location of the previous definition
     414 | #define __NR_faccessat2 439
         | 

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