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Date:   Fri, 27 Apr 2018 13:03:11 +0000
From:   Eric Dumazet <>
To:     kbuild test robot <>
Cc:, David Miller <>,
        netdev <>,
        Andy Lutomirski <>,
        LKML <>,
        linux-mm <>,
        Eric Dumazet <>,
        Soheil Hassas Yeganeh <>
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 <> wrote:

> Hi Eric,

> Thank you for the patch! Yet something to improve:

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

> url:
> config: sh-rsk7269_defconfig (attached as .config)
> compiler: sh4-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
> reproduce:
>          wget -O
>          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


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