linux-master/mm/memcontrol.c

4766 	/* Free old spare buffer and save old primary buffer as spare */
4767 	kfree(thresholds->spare);
4768 	thresholds->spare = thresholds->primary;
4827 	new = thresholds->spare;
4861 	/* Swap primary and spare array */
4862 	thresholds->spare = thresholds->primary;
4869 	/* If all events are unregistered, free the spare array */
4871 		kfree(thresholds->spare);
4872 		thresholds->spare = NULL;