Re: [iio:testing 40/43] ld.lld: error: undefined symbol: __udivdi3

From: William Breathitt Gray
Date: Tue Sep 14 2021 - 09:52:21 EST


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@xxxxxxxxx> 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@xxxxxxxxx>
> >
> > 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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