idr_alloc - allocate new idr entry
2. SYNOPSIS ▲
int idr_alloc(struct idr * idr , void * ptr , int start , int end , gfp_t gfp_mask );
3. ARGUMENTS ▲
the (initialized) idr
pointer to be associated with the new id
the minimum id (inclusive)
the maximum id (exclusive, <= 0 for max)
memory allocation flags
4. DESCRIPTION ▲
Allocate an id in [start, end) and associate it with ptr. If no ID is available in the specified range, returns -ENOSPC. On memory allocation failure, returns -ENOMEM.
Note that end is treated as max when <= 0. This is to always allow using start + N as end as long as N is inside integer range.
The user is responsible for exclusively synchronizing all operations which may modify idr. However, read-only accesses such as idr_find or iteration can be performed under RCU read lock provided the user destroys ptr in RCU-safe way after removal from idr.
5. COPYRIGHT ▲