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linux/drivers
Chris Wilson 37305ede63 drm/i915/selftests: Sabotague the RING_HEAD
Apply vast quantities of poison and not tell anyone to see if we fall
for the trap of using a stale RING_HEAD.

References: 42827350f7 ("drm/i915/gt: Avoid resetting ring->head outside of its timeline mutex")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Andi Shyti <andi.shyti@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200211205615.1190127-2-chris@chris-wilson.co.uk
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