NAME¶

idr_alloc - allocate an id

SYNOPSIS¶

int idr_alloc(struct idr * idr, void * ptr, int start, int end, gfp_t gfp);

ARGUMENTS¶

struct idr * idr

void * ptr

int start

int end

gfp_t gfp

DESCRIPTION¶

Allocates an unused ID in the range [start, end). Returns -ENOSPC if there are no unused IDs in that range.

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.

Simultaneous modifications to the idr are not allowed and should be prevented by the user, usually with a lock. idr_alloc may be called concurrently with read-only accesses to the idr, such as idr_find and idr_for_each_entry.

COPYRIGHT¶