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Date:   Tue, 14 Sep 2021 22:52:12 +0900
From:   William Breathitt Gray <vilhelm.gray@gmail.com>
To:     Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Cc:     kernel test robot <lkp@intel.com>, llvm@lists.linux.dev,
        kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
        David Lechner <david@lechnology.com>,
        Fabrice Gasnier <fabrice.gasnier@foss.st.com>,
        jarkko.nikula@linux.intel.com
Subject: Re: [iio:testing 40/43] ld.lld: error: undefined symbol: __udivdi3
Message-ID: <YUCpDDkNSqhlaThq@shinobu>
References: <202109120656.fiJqCh8H-lkp@intel.com>
 <20210914134103.00006d23@Huawei.com>
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On Tue, Sep 14, 2021 at 01:41:03PM +0100, Jonathan Cameron wrote:
> On Sun, 12 Sep 2021 06:43:58 +0800
> kernel test robot <lkp@intel.com> wrote:
>=20
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git t=
esting
> > head:   77a4a019161bcba51af1dbbeadc04795840fb3e0
> > commit: f7da4339ca510e4476ea35cb9fd44f3f190706c5 [40/43] counter: Inter=
nalize sysfs interface code
> > config: i386-randconfig-r022-20210911 (attached as .config)
> > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 26=
1cbe98c38f8c1ee1a482fe76511110e790f58a)
> > reproduce (this is a W=3D1 build):
> >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/s=
bin/make.cross -O ~/bin/make.cross
> >         chmod +x ~/bin/make.cross
> >         # https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git=
/commit/?id=3Df7da4339ca510e4476ea35cb9fd44f3f190706c5
> >         git remote add iio https://git.kernel.org/pub/scm/linux/kernel/=
git/jic23/iio.git
> >         git fetch --no-tags iio testing
> >         git checkout f7da4339ca510e4476ea35cb9fd44f3f190706c5
> >         # save the attached .config to linux build tree
> >         mkdir build_dir
> >         COMPILER_INSTALL_PATH=3D$HOME/0day COMPILER=3Dclang make.cross =
O=3Dbuild_dir ARCH=3Di386 SHELL=3D/bin/bash
> >=20
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@intel.com>
> >=20
> > All errors (new ones prefixed by >>):
> >=20
> > >> ld.lld: error: undefined symbol: __udivdi3 =20
> >    >>> referenced by intel-qep.c:290 (drivers/counter/intel-qep.c:290)
> >    >>>               counter/intel-qep.o:(intel_qep_spike_filter_ns_wri=
te) in archive drivers/built-in.a =20
> This is a result of a change to passing in a u64 instead of a string.   I=
've applied a fix
> that uses do_div() and pushed out as testing again.
>=20
> William, please sanity check that fix looks right to you.
>=20
> Thanks,
>=20
> Jonathan

Your do_div() change seems sane to me; would div_u64_rem() work here as
well, or is do_div preferred because we're not using the remainder?

I'm CCing Jarkko Nikula as well to keep them in the loop.

William Breathitt Gray

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