[Bug 98417] TTM broken on 4.9-rc2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98417

--- Comment #7 from Adam J. Richter <adam_richter2004 at yahoo.com> ---
Agreeing with the previous comments that this is probably not a TTM problem, I
want to pass along that I have observed what is probably the same problem, but
with many kernel modules unrelated to TTM and graphics.

I think it might be possible to work around the problem by disabling
CONFIG_MODVERSIONS, but just have not had the time to try that yet.

I suspect that this has something to do with the changes in symbol exports that
occurred in linux 4.9-rc1, which you can see if you do something like:

diff -pruN linux-{4.8,4.9-rc1}/arch/x86/lib

The symbols that I have had trouble with, such as memset, are ones that have
had export declarations added to assembler sources (.S files).  I see that the
entry for memset in the generated file Module.symvers is different.

In Linux 4.8, it looks like this:
0xfb578fc5      memset  vmlinux EXPORT_SYMBOL

In Linux 4.9-rc1, it looks like this:
0x00000000      memset  vmlinux EXPORT_SYMBOL

As you can see, the first field, which I believe is some sort of checksum of
the C function declaration, is all zeroes for memset in Linux 4.9-rc1.

I am still looking into this, but I am posting now because I may need to set
this task aside for a day or two and didn't want to delay in passing along
information that I think might be helpful in resolving your problem.

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