NFSD_STATS_COUNTERS_NUM
struct percpu_counter counter[NFSD_STATS_COUNTERS_NUM];
NFSD_STATS_COUNTERS_NUM);
percpu_counter_destroy_many(nn->counter, NFSD_STATS_COUNTERS_NUM);
percpu_counter_destroy_many(nn->counter, NFSD_STATS_COUNTERS_NUM);