chain_mode
if (priv->chain_mode) {
unsigned int chain_mode;
static unsigned int chain_mode;
module_param(chain_mode, int, 0444);
MODULE_PARM_DESC(chain_mode, "To use chain instead of ring mode");
chain_mode = 1;
priv->chain_mode = chain_mode;
if (kstrtoint(opt + 11, 0, &chain_mode))
enum chain_mode mode)
enum chain_mode mode;