linux-kernel - Re: super.c:undefined reference to `_

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Date:   Wed, 7 Jul 2021 16:20:03 +0200 (CEST)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     David Sterba <dsterba@...e.cz>
cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: Re: super.c:undefined reference to `__umoddi3'

On Wed, 7 Jul 2021, David Sterba wrote:

> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   79160a603bdb51916226caf4a6616cc4e1c58a58
> > commit: c49f71f60754acbff37505e1d16ca796bf8a8140 MIPS: Reinstate platform `__div64_32' handler
> 
> Is it caused by this patch? It seems to be only MIPS-related, otherwise
> we'd get reports from other 32bit arches in case of the emulated 64bit
> division.

 Not really, cf. 
<https://lore.kernel.org/lkml/alpine.DEB.2.22.394.2105200927570.1771368@ramsan.of.borg/>.

 I've seen an earlier report already and will do a test build as a matter 
of interest to see why it triggered around the MIPS change only, once I'm 
done with the current stuff.

  Maciej