centos man page for idr_for_each

IDR_FOR_EACH(9) 					  Basic Kernel Library Functions					   IDR_FOR_EACH(9)

NAME
       idr_for_each - iterate through all stored pointers

SYNOPSIS
       int idr_for_each(struct idr * idp, int (*fn) (int id, void *p, void *data), void * data);

ARGUMENTS
       idp
	   idr handle

       fn
	   function to be called for each pointer

       data
	   data passed back to callback function

DESCRIPTION
       Iterate over the pointers registered with the given idr. The callback function will be called for each pointer currently registered,
       passing the id, the pointer and the data pointer passed to this function. It is not safe to modify the idr tree while in the callback, so
       functions such as idr_get_new and idr_remove are not allowed.

       We check the return of fn each time. If it returns anything other than 0, we break out and return that value.

       The caller must serialize idr_for_each vs idr_get_new and idr_remove.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							   IDR_FOR_EACH(9)