channel_walk_data_t
channel_walk_data_t *ch_walker;
ch_walker = mdb_zalloc(sizeof (channel_walk_data_t), UM_SLEEP);
channel_walk_data_t *ch_walker;
ch_walker = (channel_walk_data_t *)wsp->walk_data;
channel_walk_data_t *ch_walker = wsp->walk_data;