1*4882a593Smuzhiyuncat << EOF 2*4882a593Smuzhiyun/** 3*4882a593Smuzhiyun * ${arch}${atomic}_fetch_add_unless - add unless the number is already a given value 4*4882a593Smuzhiyun * @v: pointer of type ${atomic}_t 5*4882a593Smuzhiyun * @a: the amount to add to v... 6*4882a593Smuzhiyun * @u: ...unless v is equal to u. 7*4882a593Smuzhiyun * 8*4882a593Smuzhiyun * Atomically adds @a to @v, so long as @v was not already @u. 9*4882a593Smuzhiyun * Returns original value of @v 10*4882a593Smuzhiyun */ 11*4882a593Smuzhiyunstatic __always_inline ${int} 12*4882a593Smuzhiyun${arch}${atomic}_fetch_add_unless(${atomic}_t *v, ${int} a, ${int} u) 13*4882a593Smuzhiyun{ 14*4882a593Smuzhiyun ${int} c = ${arch}${atomic}_read(v); 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun do { 17*4882a593Smuzhiyun if (unlikely(c == u)) 18*4882a593Smuzhiyun break; 19*4882a593Smuzhiyun } while (!${arch}${atomic}_try_cmpxchg(v, &c, c + a)); 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun return c; 22*4882a593Smuzhiyun} 23*4882a593SmuzhiyunEOF 24