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When allocating objects from stolen, memset() the backing store to POISON_INUSE (0x5a) to help identify any uninitialised use of a stolen object. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201019165005.18128-1-chris@chris-wilson.co.uk