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

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Date:   Sun, 18 Dec 2016 12:03:34 +0100
From:   Arend Van Spriel <arend.vanspriel@...adcom.com>
To:     Jiri Slaby <jslaby@...e.cz>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Adam Borowski <kilobyte@...band.pl>,
        Nicholas Piggin <npiggin@...il.com>,
        Omar Sandoval <osandov@...ndov.com>,
        Michal Marek <mmarek@...e.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: [GIT PULL] kbuild changes for v4.9-rc1

On 18-12-2016 11:49, Jiri Slaby wrote:
> On 12/18/2016, 12:59 AM, Linus Torvalds wrote:
>> On Sat, Dec 17, 2016 at 12:57 AM, Jiri Slaby <jslaby@...e.cz> wrote:
>>>
>>> Yes, disk drivers won't load:
>>> [    2.141973] virtio_pci: disagrees about version of symbol mcount
>>> [    2.144415] virtio_pci: Unknown symbol mcount (err -22)
>>
>> This makes no sense.
>>
>> mcount isn't even one of the symbols that the patch by Adam is touching.
> 
> asm-prototypes.h in his patch includes asm/ftrace.h, where the function
> is declared. That should be enough IIUC scripts/Makefile.build.
> 
>> There's something else screwed up here. Not to mention that others
>> don't have your issue.
> 
> I suppose people don't run i386 kernels or have different config.
> 
>> Do you have some other hacks in this area? Are you testing actual
>> plain 4.9, or do you (for example) still carry Arnd's patch around
>> that turned out to not work (reverted by f27c2f69cc8e in my tree)?
> 
> Not at all. This was plain 4.9 packaged by suse -- only rpm-related
> fixes. I tried plain 4.9 without rpm right now with the same output:
> # insmod soundcore.ko
> [   31.582326] soundcore: disagrees about version of symbol mcount
> [   31.586183] soundcore: Unknown symbol mcount (err -22)
> insmod: ERROR: could not insert module soundcore.ko: Invalid parameters

I hit an mcount issue a while back (years?) which was due to building a
driver with gcc v4.x while kernel was built using gcc v4.y. Not claiming
that is your issue though.

Regards,
Arend