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Date:   Mon, 06 Apr 2020 15:51:22 -0400
From:   "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
Subject: Bad rss-counter state from drm/ttm, drm/vmwgfx: Support huge TTM
 pagefaults
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Using 314b658 with amdgpu, starting sway and firefox causes "BUG: Bad=20
rss-counter state" and "BUG: non-zero pgtables_bytes on freeing mm" to=20
start filling dmesg, and then closing programs causes more BUGs and=20
hangs, and then everything grinds to a halt (can't start more programs,=20
can't even reboot through systemd).

Using master and reverting that branch up to that point fixes the=20
problem.

I'm using a Ryzen 1600 and AMD Radeon RX 480 on an ASRock B450 Pro4=20
board with IOMMU enabled.