arch/powerpc/boot/../../../lib/xz/xz_crc32.c:18:10: fatal error: linux/crc32poly.h: No such file or directory

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   815f0ddb346c196018d4d8f8f55c12b83da1de3f
commit: faa16bc404d72a5afb857c924c83a5f691f83386 lib: Use existing define with polynomial
date:   4 weeks ago
config: powerpc-skiroot_defconfig (attached as .config)
compiler: powerpc64-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
        git checkout faa16bc404d72a5afb857c924c83a5f691f83386
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

   In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:233:0,
                    from arch/powerpc/boot/decompress.c:42:
>> arch/powerpc/boot/../../../lib/xz/xz_crc32.c:18:10: fatal error: linux/crc32poly.h: No such file or directory
    #include <linux/crc32poly.h>
             ^~~~~~~~~~~~~~~~~~~
   compilation terminated.

vim +18 arch/powerpc/boot/../../../lib/xz/xz_crc32.c

  > 18	#include <linux/crc32poly.h>
    19	#include "xz_private.h"
    20	

---
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