netdev - [net-next:master 488/665] verifier.c:undefined reference to `__multi3'

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Message-ID: <20171112013345.6gfkq4xuaxdoxa2k@wfg-t540p.sh.intel.com>
Date:   Sun, 12 Nov 2017 09:33:45 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     GCC Development <gcc@....gnu.org>
Cc:     Alexei Starovoitov <ast@...com>, netdev@...r.kernel.org,
        kbuild-all@...org
Subject: [net-next:master 488/665] verifier.c:undefined reference to
 `__multi3'

CC gcc list. According to Alexei:

         This is 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.

         Digging further, this function was added to
                 arch/sparc/lib/multi3.S
         since gcc doing the same "optimization" there.
         Adding asm code doesn't look right to me. I'd rather push
         gcc folks to avoid such codegen.

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:
         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
         chmod +x ~/bin/make.cross
         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'
    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

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