centos man page for __atomic_add_unless

__ATOMIC_ADD_UNLESS(9)						   Driver Basics					    __ATOMIC_ADD_UNLESS(9)

NAME
       __atomic_add_unless - add unless the number is already a given value

SYNOPSIS
       int __atomic_add_unless(atomic_t * v, int a, int u);

ARGUMENTS
       v
	   pointer of type atomic_t

       a
	   the amount to add to v...

       u
	   ...unless v is equal to u.

DESCRIPTION
       Atomically adds a to v, so long as v was not already u. Returns the old value of v.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						    __ATOMIC_ADD_UNLESS(9)