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For a ppgtt that we are constructing, there is no struct_mutex dependence so skip it. In the process, also ping the scheduler frequently to try and avoid the NMI watchdog. v2: gen6 requires struct_mutex to clean up (currently) Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> References: https://bugs.freedesktop.org/show_bug.cgi?id=107094 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180703135331.12265-1-chris@chris-wilson.co.uk