linux-kernel - Re: [iio:testing 40/43] ld.lld: error: undefined symbol: _

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Date:   Tue, 14 Sep 2021 22:52:12 +0900
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        David Lechner <david@...hnology.com>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
        jarkko.nikula@...ux.intel.com
Subject: Re: [iio:testing 40/43] ld.lld: error: undefined symbol: __udivdi3

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@...el.com> wrote:
> 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git testing
> > head:   77a4a019161bcba51af1dbbeadc04795840fb3e0
> > commit: f7da4339ca510e4476ea35cb9fd44f3f190706c5 [40/43] counter: Internalize sysfs interface code
> > config: i386-randconfig-r022-20210911 (attached as .config)
> > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 261cbe98c38f8c1ee1a482fe76511110e790f58a)
> > reproduce (this is a W=1 build):
> >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/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=f7da4339ca510e4476ea35cb9fd44f3f190706c5
> >         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=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=i386 SHELL=/bin/bash
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@...el.com>
> > 
> > All errors (new ones prefixed by >>):
> > 
> > >> ld.lld: error: undefined symbol: __udivdi3  
> >    >>> referenced by intel-qep.c:290 (drivers/counter/intel-qep.c:290)
> >    >>>               counter/intel-qep.o:(intel_qep_spike_filter_ns_write) in archive drivers/built-in.a  
> 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.
> 
> William, please sanity check that fix looks right to you.
> 
> Thanks,
> 
> 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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