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

From	Jan Stancek <jstancek@redhat.com>
Newsgroups	linux.kernel
Subject	unable to load modules with CONFIG_MODVERSIONS=y after commit 8ab2ae655b
Date	2016-12-06 14:40 +0100
Message-ID	<sLo8q-2Cu-1@gated-at.bofh.it> (permalink)
References	<sLo8q-2Cu-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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

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unable to load modules with CONFIG_MODVERSIONS=y after commit  8ab2ae655b Jan Stancek <jstancek@redhat.com> - 2016-12-06 14:40 +0100
  Re: unable to load modules with CONFIG_MODVERSIONS=y after commit  8ab2ae655b Adam Borowski <kilobyte@angband.pl> - 2016-12-06 14:50 +0100
    Re: unable to load modules with CONFIG_MODVERSIONS=y after commit 8ab2ae655b Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-06 17:50 +0100
      Re: unable to load modules with CONFIG_MODVERSIONS=y after commit 8ab2ae655b Arnd Bergmann <arnd@arndb.de> - 2016-12-08 00:20 +0100

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