centos man page for idr_replace

IDR_REPLACE(9)						  Basic Kernel Library Functions					    IDR_REPLACE(9)

NAME
       idr_replace - replace pointer for given id

SYNOPSIS
       void * idr_replace(struct idr * idp, void * ptr, int id);

ARGUMENTS
       idp
	   idr handle

       ptr
	   pointer you want associated with the id

       id
	   lookup key

DESCRIPTION
       Replace the pointer registered with an id and return the old value. A -ENOENT return indicates that id was not found. A -EINVAL return
       indicates that id was not within valid constraints.

       The caller must serialize with writers.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							    IDR_REPLACE(9)