ufs build failure (no __udivdi3) on i386 in linux tip (edf9364d3f92)

From: Ian Jackson
Date: Mon Jun 19 2017 - 10:37:13 EST

osstest service owner writes ("[linux-linus bisection] complete build-i386-pvops"):
> branch xen-unstable
> xenbranch xen-unstable
> job build-i386-pvops
> testid kernel-build
> Tree: linux git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
> Tree: linuxfirmware git://xenbits.xen.org/osstest/linux-firmware.git
> *** Found and reproduced problem changeset ***
> Bug is in tree: linux git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
> Bug introduced: edf9364d3f924aff6f77176b8e52a4b68e5c30d6
> Bug not present: 791a9a666d1afe2603bcb2c6a4852d684e879252
> Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/110566/

This is a merge commit, so the bisection result is not very useful:

git-log --pretty=oneline 791a9a666d1afe2603bcb2c6a4852d684e879252..edf9364d3f924aff6f77176b8e52a4b68e5c30d6 | wc -l

The error message is this:

ERROR: "__udivdi3" [fs/ufs/ufs.ko] undefined!
scripts/Makefile.modpost:91: recipe for target '__modpost' failed
make[1]: *** [__modpost] Error 1

I searched the commit log and CC'd a couple of people who have fixed
similar bugs elsewhere.