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14eb0cb4e9
In theory a context can be destroyed and a new one allocated at the same
address, making the pointer comparision to detect when we don't need to
update the current pagetables invalid. Instead assign a sequence number
to each context on creation, and use this for the check.
Fixes: 84c31ee16f ("drm/msm/a6xx: Add support for per-instance pagetables")
Signed-off-by: Rob Clark <robdclark@chromium.org>