netdev - Re: [net-next:master 488/665] verifier.c:undefined reference to `_

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Message-ID: <801c6870-3b60-bcc8-327f-2b30b5772133@fb.com>
Date:   Sun, 12 Nov 2017 09:14:14 +0800
From:   Alexei Starovoitov <ast@...com>
To:     kbuild test robot <fengguang.wu@...el.com>
CC:     <kbuild-all@...org>, <netdev@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [net-next:master 488/665] verifier.c:undefined reference to
 `__multi3'

On 11/12/17 8:23 AM, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
> head:   7c5556decd0a629e9ee02e93653f75ba7b7da03c
> commit: 638f5b90d46016372a8e3e0a434f199cc5e12b8c [488/665] bpf: reduce verifier memory consumption
> config: mips-64r6el_defconfig (attached as .config)
> compiler: mips64el-linux-gnuabi64-gcc (Debian 7.2.0-11) 7.2.0
> reproduce:
>         git checkout 638f5b90d46016372a8e3e0a434f199cc5e12b8c
>         # save the attached .config to linux build tree
>         make.cross ARCH=mips
>
> All errors (new ones prefixed by >>):
>
>    kernel/bpf/verifier.o: In function `realloc_verifier_state.isra.19':
>>> verifier.c:(.text+0x36fc): undefined reference to `__multi3'

that's a known issue with gcc 7 on mips that is "optimizing"
normal 64-bit multiply into 128-bit variant.
Nothing to fix on the kernel side.

>    crypto/scompress.o: In function `.L82':
>    scompress.c:(.text+0x55c): undefined reference to `__multi3'
>    lib/mpi/generic_mpih-mul1.o: In function `.L2':
>    generic_mpih-mul1.c:(.text+0x60): undefined reference to `__multi3'
>    lib/mpi/generic_mpih-mul2.o: In function `.L2':
>    generic_mpih-mul2.c:(.text+0x5c): undefined reference to `__multi3'
>    lib/mpi/generic_mpih-mul3.o: In function `.L2':
>    generic_mpih-mul3.c:(.text+0x5c): undefined reference to `__multi3'
>    lib/mpi/mpih-div.o:mpih-div.c:(.text+0x1b8): more undefined references to `__multi3' follow
>