linux-kernel - Re: unable to load modules with CONFIG_MODVERSIONS=y after commit 8ab2ae655b

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Date:   Tue, 6 Dec 2016 14:44:54 +0100
From:   Adam Borowski <kilobyte@...band.pl>
To:     Jan Stancek <jstancek@...hat.com>
Cc:     linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        arnd@...db.de
Subject: Re: unable to load modules with CONFIG_MODVERSIONS=y after commit
 8ab2ae655b

On Tue, Dec 06, 2016 at 08:31:01AM -0500, Jan Stancek wrote:
> Starting with 4.9-rc8 / commit 8ab2ae655b ("default exported asm symbols to zero")
> I'm running into issue with kernel built with CONFIG_MODVERSIONS=y
> and (older) binutils (binutils-2.25.1-20.base.el7.ppc64le). 
> 
> Modules fail to load, for example:
> 
> [    3.163646] Found checksum 0 vs module 4829A47E 
> [    3.163787] dm_mod: disagrees about version of symbol memcpy 
> [    3.163862] dm_mod: Unknown symbol memcpy (err -22)
> 
> Bisect led me to 8ab2ae655b, reverting it allows boot to
> progress as before.

powerpc happens to be the only arch that actually followed the plan and
implemented asm-prototypes.h (not including Debian which applied my patch to
do so on x86, that patch is not in mainline).

Could you try reverting commits that add exports to that file?

-- 
u-boot problems can be solved with the help of your old SCSI manuals, the
parts that deal with goat termination.  You need a black-handled knife, and
an appropriate set of candles (number and color matters).  Or was it a
silver-handled knife?  Crap, need to look that up.