idr_alloc

函数名称：dr_alloc() - Allocate an ID.*@idr: IDR handle.*@ptr: Pointer to be associated with the new ID.*@start: The minimum ID (inclusive).*@end: The maximum ID (exclusive).*@gfp: Memory allocation flags.

函数原型：int idr_alloc(struct idr *idr, void *ptr, int start, int end, gfp_t gfp)

返回类型：int

参数：

类型	参数	名称
struct idr *	idr
void *	ptr
int	start
int	end
gfp_t	gfp

**调用者**
名称	描述
alloc_pid	分配进程句柄
irq_timings_alloc
cgroup_idr_alloc	IDR wrappers which synchronize using cgroup_idr_lock
perf_pmu_register
mem_cgroup_alloc
bsg_register_queue
worker_pool_assign_id	worker_pool_assign_id - allocate ID and assing it to @pool@pool: the pool pointer of interest Returns 0 if ID in [0, WORK_OFFQ_POOL_NONE) is allocated and assigned* successfully, -errno on failure.
prealloc_memcg_shrinker
ipc_idr_alloc	Insert new IPC object into idr tree, and set sequence number and id* in the correct order.* Especially:* - the sequence number must be set before inserting the object into the idr,* because the sequence number is accessed without a lock.
blk_alloc_devt	lk_alloc_devt - allocate a dev_t for a partition@part: partition to allocate dev_t for@devt: out parameter for resulting dev_t* Allocate a dev_t for block device
aa_alloc_secid	aa_alloc_secid - allocate a new secid for a profile@label: the label to allocate a secid for@gfp: memory allocation flags* Returns: 0 with @label->secid initialized* <0 returns error with @label->secid set to AA_SECID_INVALID

函数逻辑报告