ZSPAGE_MAGIC      518 mm/zsmalloc.c  	BUG_ON(zspage->magic != ZSPAGE_MAGIC);
ZSPAGE_MAGIC      828 mm/zsmalloc.c  	BUG_ON(zspage->magic != ZSPAGE_MAGIC);
ZSPAGE_MAGIC     1075 mm/zsmalloc.c  	zspage->magic = ZSPAGE_MAGIC;