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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