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We set them to scratch right after allocation so prevent useless zeroing before. v2: atomic_t v3: allow pdp alloc fail Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20190614164350.30415-1-mika.kuoppala@linux.intel.com