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The phys object is a rarely used device (only very old machines require a chunk of physically contiguous pages for a few hardware interactions). As such, it is not exercised by CI and to combat that we want to add a test that exercises the phys object on all platforms. v2: Always set err on error paths and not rely on inheriting the err. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-17-chris@chris-wilson.co.uk