-
- if (unlikely(_raw_compare_and_swap(&lp->lock, 0, pc) != 0))
- _raw_spin_lock_wait(lp, pc);
+ int old;
+
+ old = _raw_compare_and_swap(&lp->owner_cpu, 0, ~smp_processor_id());
+ if (likely(old == 0)) {
+ lp->owner_pc = pc;
+ return;
+ }
+ _raw_spin_lock_wait(lp, pc);