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

Adam Borowski
2016-12-17T09:39:41Z

On Sat, Dec 17, 2016 at 09:57:47AM +0100, Jiri Slaby wrote:
> On 12/16/2016, 08:57 PM, Linus Torvalds wrote:
> > On Fri, Dec 16, 2016 at 11:55 AM, Jiri Slaby <jslaby@suse.cz> wrote:
> >>
> >> what happened to this? I had to apply this to fix 4.9-pae kernel here.
> >
> > Did you actually have to do that?
>
> 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)
> and whole machine gets stuck with systemd waiting for /dev/sd*.
>
> > Because a missing CRC shouldn't be fatal in 4.9.

Most of us get just a scary-looking warning, but whatever the problem is for
you, it's good to hear this patch works around it.

Whatever the long-term solution will be, for 4.10 an updated[1] version of
this fix is on kbuild/kbuild (and kbuild/for-next). I guess we'll bother
stable@ once it is merged.

Note that it handles only x86, there's a bunch of other architectures
affected, alpha m68k s390 sparc ia64 might still need fixing.

Meow!

[1]. Turns out there was a missing symbol on 486; people build-test those
but don't try to actually boot, and even when they do, they don't read
warnings.
--
Autotools hint: to do a zx-spectrum build on a pdp11 host, type:
./configure --host=zx-spectrum --build=pdp11