Bad rss-counter state from drm/ttm, drm/vmwgfx: Support huge TTM pagefaults

[Thomas Hellström (VMware)]

On 4/7/20 2:38 AM, Alex Xu (Hello71) wrote:
> Excerpts from Thomas Hellström (VMware)'s message of April 6, 2020 5:04 pm:
>> Hi,
>>
>> On 4/6/20 9:51 PM, Alex Xu (Hello71) wrote:
>>> Using 314b658 with amdgpu, starting sway and firefox causes "BUG: Bad
>>> rss-counter state" and "BUG: non-zero pgtables_bytes on freeing mm" to
>>> start filling dmesg, and then closing programs causes more BUGs and
>>> hangs, and then everything grinds to a halt (can't start more programs,
>>> can't even reboot through systemd).
>>>
>>> Using master and reverting that branch up to that point fixes the
>>> problem.
>>>
>>> I'm using a Ryzen 1600 and AMD Radeon RX 480 on an ASRock B450 Pro4
>>> board with IOMMU enabled.
>> If you could try the attached patch, that'd be great!
>>
>> Thanks,
>>
>> Thomas
>>
> Yeah, that works too. Kernel config sent off-list.
>
> Regards,
> Alex.

Thanks. Do you want me to add your

Reported-by: and Tested-by: To this patch?

/Thomas