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 non-zero if v was not u, and zero otherwise.