Re: [PATCH v2 net-next 1/2] tcp: add TCP_ZEROCOPY_RECEIVE support for zerocopy receive

On Fri, Apr 27, 2018 at 1:45 AM kbuild test robot [off-list ref] wrote:

Hi Eric,

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/Eric-Dumazet/tcp-add-TCP_ZEROCOPY_RECEIVE-support-for-zerocopy-receive/20180427-122234

config: sh-rsk7269_defconfig (attached as .config)
compiler: sh4-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=sh

All errors (new ones prefixed by >>):

    net/ipv4/tcp.o: In function `tcp_setsockopt':

quoted

quoted

tcp.c:(.text+0x3f80): undefined reference to `zap_page_range'

I guess this tcp zerocopy stuff depends on CONFIG_MMU

Thanks.