centos man page for wait_on_bit_lock

WAIT_ON_BIT_LOCK(9)						   Driver Basics					       WAIT_ON_BIT_LOCK(9)

NAME
       wait_on_bit_lock - wait for a bit to be cleared, when wanting to set it

SYNOPSIS
       int wait_on_bit_lock(void * word, int bit, int (*action) (void *), unsigned mode);

ARGUMENTS
       word
	   the word being waited on, a kernel virtual address

       bit
	   the bit of the word being waited on

       action
	   the function used to sleep, which may take special actions

       mode
	   the task state to sleep in

DESCRIPTION
       There is a standard hashed waitqueue table for generic use. This is the part of the hashtable's accessor API that waits on a bit when one
       intends to set it, for instance, trying to lock bitflags. For instance, if one were to have waiters trying to set bitflag and waiting for
       it to clear before setting it, one would call wait_on_bit in threads waiting to be able to set the bit. One uses wait_on_bit_lock where one
       is waiting for the bit to clear with the intention of setting it, and when done, clearing it.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						       WAIT_ON_BIT_LOCK(9)