idr
简介
void idr_init(struct idr *idp);int idr_pre_get(struct idr *idp, gfp_t gfp_mask);
int idr_get_new(struct idr *idp, void *ptr, int *id);void *idr_find(struct idr *idp, int id);void idr_remove(struct idr *idp, int id);
or
void idr_remove_all(struct idr *idp);
void idr_destroy(struct idr *idp);实践
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