Re: [net-next V7 PATCH 12/16] page_pool: refurbish version of page_pool code

Hi Jesper,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Jesper-Dangaard-Brouer/XDP-redirect-memory-return-API/20180330-203122
config: m68k-sun3_defconfig (attached as .config)
compiler: m68k-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
        # save the attached .config to linux build tree
        make.cross ARCH=m68k 

All errors (new ones prefixed by >>):

   net/core/page_pool.o: In function `__page_pool_alloc_pages_slow':

quoted

page_pool.c:(.text+0x9a): undefined reference to `bad_dma_ops'

   page_pool.c:(.text+0xa8): undefined reference to `bad_dma_ops'
   net/core/page_pool.o: In function `__page_pool_clean_page.isra.0':
   page_pool.c:(.text+0x27a): undefined reference to `bad_dma_ops'

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