suse man page for __change_bit

__CHANGE_BIT(9) 					     Basic C Library Functions						   __CHANGE_BIT(9)

NAME
       __change_bit - Toggle a bit in memory

SYNOPSIS
       void __change_bit(int nr, volatile unsigned long * addr);

ARGUMENTS
       nr
	   the bit to change

       addr
	   the address to start counting from

DESCRIPTION
       Unlike change_bit, this function is non-atomic and may be reordered. If it's called on the same region of memory simultaneously, the effect
       may be that only one operation succeeds.

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