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: score-spct6600_defconfig (attached as .config)
compiler: score-elf-gcc (GCC) 4.9.4
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=score 

All errors (new ones prefixed by >>):

   init/main.o: In function `try_to_run_init_process':
   main.c:(.text+0x40): relocation truncated to fit: R_SCORE_24 against `run_init_process'
   main.c:(.text+0x78): relocation truncated to fit: R_SCORE_24 against `.L36'
   init/main.o: In function `.L132':
   main.c:(.text+0x190): relocation truncated to fit: R_SCORE_24 against `.L129'
   main.c:(.text+0x200): relocation truncated to fit: R_SCORE_24 against `.L132'
   init/main.o: In function `loglevel':
   main.c:(.init.text+0xa4): relocation truncated to fit: R_SCORE_24 against `get_option'
   init/main.o: In function `.L15':
   main.c:(.init.text+0x110): relocation truncated to fit: R_SCORE_24 against `strcmp'
   main.c:(.init.text+0x124): relocation truncated to fit: R_SCORE_24 against `parameq'
   main.c:(.init.text+0x14c): relocation truncated to fit: R_SCORE_24 against `printk'
   init/main.o: In function `.L31':
   main.c:(.init.text+0x160): relocation truncated to fit: R_SCORE_24 against `strcmp'
   init/main.o: In function `.L21':
   main.c:(.init.text+0x170): relocation truncated to fit: R_SCORE_24 against `.L15'
   init/main.o: In function `initcall_blacklist':
   main.c:(.init.text+0x198): additional relocation overflows omitted from the output
   net/core/page_pool.o: In function `__page_pool_alloc_pages_slow':

quoted

page_pool.c:(.text.__page_pool_alloc_pages_slow+0x74): undefined reference to `bad_dma_ops'

   page_pool.c:(.text.__page_pool_alloc_pages_slow+0x78): undefined reference to `bad_dma_ops'
   page_pool.c:(.text.__page_pool_alloc_pages_slow+0x8c): undefined reference to `bad_dma_ops'
   page_pool.c:(.text.__page_pool_alloc_pages_slow+0x90): undefined reference to `bad_dma_ops'
   net/core/page_pool.o: In function `__page_pool_clean_page.isra.14':

quoted

page_pool.c:(.text.__page_pool_clean_page.isra.14+0x2c): undefined reference to `bad_dma_ops'

   net/core/page_pool.o:page_pool.c:(.text.__page_pool_clean_page.isra.14+0x30): more undefined references to `bad_dma_ops' follow

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