| 299,6 → 299,23 |
|---|
| __u.__val; \ |
| }) |
| |
| /** |
| * smp_cond_acquire() - Spin wait for cond with ACQUIRE ordering |
| * @cond: boolean expression to wait for |
| * |
| * Equivalent to using smp_load_acquire() on the condition variable but employs |
| * the control dependency of the wait to reduce the barrier on many platforms. |
| * |
| * The control dependency provides a LOAD->STORE order, the additional RMB |
| * provides LOAD->LOAD order, together they provide LOAD->{LOAD,STORE} order, |
| * aka. ACQUIRE. |
| */ |
| #define smp_cond_acquire(cond) do { \ |
| while (!(cond)) \ |
| cpu_relax(); \ |
| smp_rmb(); /* ctrl + rmb := acquire */ \ |
| } while (0) |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* __ASSEMBLY__ */ |