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

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Message-ID: <656276734.2322009.1481031061742.JavaMail.zimbra@redhat.com>
Date:   Tue, 6 Dec 2016 08:31:01 -0500 (EST)
From:   Jan Stancek <jstancek@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, kilobyte@...band.pl, arnd@...db.de
Subject: unable to load modules with CONFIG_MODVERSIONS=y after commit
 8ab2ae655b

Hi,

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.

Regards,
Jan