bug #1536076 - Missing export symbol for mtrr_add and mtrr_del

[Alberto Milone]

On 21-01-16 16:28:08, Tim Gardner wrote:
> Alberto - I've applied a patch to Xenial master-next to export these
> symbols, but I'm wondering how fglrx ever worked for Linux 4.3 ?
>

Hi Tim,

I am pretty sure fglrx works with 4.3. Also, I tested fglrx with 4.4
(from the kernel team PPA) before my last upload. I have just booted the
same system, just to double check, and I can't see any related errors in
dmesg:

:~$ uname -r
4.4.0-0-generic

:~$ dkms status
fglrx-core, 15.201, 4.3.0-2-generic, x86_64: installed
fglrx-core, 15.201, 4.4.0-0-generic, x86_64: installed


:~$ apt-cache policy linux-image-4.4.0-0-generic
linux-image-4.4.0-0-generic:
  Installed: 4.4.0-0.11
  Candidate: 4.4.0-0.11
  Version table:
 *** 4.4.0-0.11 0
        100 /var/lib/dpkg/status

:~$ apt-cache policy fglrx
fglrx:
  Installed: 2:15.201-0ubuntu6
  Candidate: 2:15.201-0ubuntu6
  Version table:
 *** 2:15.201-0ubuntu6 0
        500 http://it.archive.ubuntu.com/ubuntu/ xenial/restricted amd64 Packages
        100 /var/lib/dpkg/status

dmesg output:
http://paste.ubuntu.com/14596870/

> Do you think this is the right thing to do ?
>
> rtg

My patch for Linux 4.3 replaces mtrr_add with arch_phys_wc_add, and
mtrr_del with arch_phys_wc_del. I don't think we need to add any symbols
to the kernel.

I suspect the user who reported the problem is using the upstream fglrx
packages, which do not include any kernel patches.

Regards,

--
Alberto Milone
Software Engineer
Hardware Enablement Team
Professional and Engineering Services