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Currently, we check that a new context has a clear set of general purpose registers. Add a little bit of hostility by preempting our new context and re-poisoning the GPR to ensure that there is no context leakage from preemption. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Ramalingam C <ramalingam.c@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200219123418.1447428-1-chris@chris-wilson.co.uk