linux-kernel - Re: [GIT PULL] kbuild changes for v4.9-rc1

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Date:   Mon, 17 Oct 2016 08:51:31 +0200
From:   Adam Borowski <kilobyte@...band.pl>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Omar Sandoval <osandov@...ndov.com>,
        Michal Marek <mmarek@...e.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        adobriyan@...il.com, sfr@...b.auug.org.au, viro@...iv.linux.org.uk,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] kbuild changes for v4.9-rc1

On Mon, Oct 17, 2016 at 02:57:09PM +1100, Nicholas Piggin wrote:
> On Sat, 15 Oct 2016 17:22:05 -0700 Omar Sandoval <osandov@...ndov.com> wrote:
> > On Fri, Oct 14, 2016 at 10:12:46PM +0200, Michal Marek wrote:
> > > please pull these kbuild changes for v4.9-rc1:
> > > 
> > > - EXPORT_SYMBOL for asm source by Al Viro. This does bring a regression,
> > >   because genksyms no longer generates checksums for these symbols
> > >   (CONFIG_MODVERSIONS). Nick Piggin is working on a patch to fix this.
> > >   Plus, we are talking about functions like strcpy(), which rarely
> > >   change prototypes.  
> > 
> > So this has broken all module loading for me. I get the following dmesg
> > spew:
> > ...
> > [    4.586914] scsi_mod: no symbol version for memset
> > [    4.587920] scsi_mod: Unknown symbol memset (err -22)
> > [    4.588443] scsi_mod: no symbol version for ___preempt_schedule
> > [    4.589026] scsi_mod: Unknown symbol ___preempt_schedule (err -22)
> > ...
> > 
> > Reverting 784d5699eddc ("x86: move exports to actual definitions") fixes
> > it for me. This is with GCC 6.2.1, binutils 2.27, attached config.
> 
> Thanks for the report. Could you try this patch and see if it helps?
[patch snipped]

Omar probably won't wake up in quite a while, so I've tested the patch.
Alas, doesn't help.  Similar spew (for the few modules I don't have =y),
while reverting 784d5699eddc fixes it for me too.

Debian sid toolchain: gcc 6.2.0-6, binutils 2.27-8, config at
https://angband.pl/tmp/config-4.9.0-rc1-debug+.gz


Meow!
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