netdev - Re: [PATCH v2 net-next 1/2] tcp: add TCP_ZEROCOPY

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Date:   Fri, 27 Apr 2018 13:03:11 +0000
From:   Eric Dumazet <edumazet@...gle.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>
Subject: 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 <lkp@...el.com> 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':
> >> tcp.c:(.text+0x3f80): undefined reference to `zap_page_range'

I guess this tcp zerocopy stuff depends on CONFIG_MMU

Thanks.