bch_encode
bch_encode(engine_conf->bch, erased_page, eccsize,
bch_encode(engine_conf->bch, buf, nand->ecc.ctx.conf.step_size, code);
void bch_encode(struct bch_control *bch, const uint8_t *data,
bch_encode(bch, data, len, NULL);
EXPORT_SYMBOL_GPL(bch_encode);