slab_attribute
#define to_slab_attr(n) container_of(n, struct slab_attribute, attr)
static struct slab_attribute _name##_attr = __ATTR_RO_MODE(_name, 0400)
static struct slab_attribute _name##_attr = __ATTR_RW_MODE(_name, 0600)
struct slab_attribute *attribute;
struct slab_attribute *attribute;