suse man page for kfifo_in

KFIFO_IN(9)							    FIFO Buffer 						       KFIFO_IN(9)

NAME
       kfifo_in - puts some data into the FIFO

SYNOPSIS
       unsigned int kfifo_in(struct kfifo * fifo, const void * from, unsigned int len);

ARGUMENTS
       fifo
	   the fifo to be used.

       from
	   the data to be added.

       len
	   the length of the data to be added.

DESCRIPTION
       This function copies at most len bytes from the from buffer into the FIFO depending on the free space, and returns the number of bytes
       copied.

       Note that with only one concurrent reader and one concurrent writer, you don't need extra locking to use these functions.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							       KFIFO_IN(9)