linux-kernel - Re: [PATCH] x86/kbuild: enable modversions for symbols exported from asm

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Message-ID: <29219570-8ede-8388-9313-d1d4db226b2a@suse.com>
Date:   Thu, 1 Dec 2016 17:14:19 +0100
From:   Michal Marek <mmarek@...e.com>
To:     Don Zickus <dzickus@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Nicholas Piggin <npiggin@...il.com>, skozina@...hat.com,
        Ben Hutchings <ben@...adent.org.uk>,
        Adam Borowski <kilobyte@...band.pl>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Debian kernel maintainers <debian-kernel@...ts.debian.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/kbuild: enable modversions for symbols exported from
 asm

On 2016-12-01 05:13, Don Zickus wrote:
> Sorry for chiming in late, but yes RHEL is a big user of MODVERSIONS for our
> kabi protection work.  Despite our best intentions we still have lots of
> partners and customers that provide value-add out-of-tree drivers to their
> customers.  These module builders requested we have a mechanism to allow
> rolling modules forward for each of our minor RHEL updates without breaking
> their drivers.

FWIW, in SLES we use CONFIG_MODVERSION for pretty much the same reasons
you listed. We also enable it in openSUSE, but there it's not as crucial.

Michal