+static inline bool nvme_rdma_queue_sig_limit(struct nvme_rdma_queue *queue)
+{
+ int v, old;
+
+ v = atomic_read(&queue->sig_count);
+ while (1) {
+ if (v > 1) {
+ old = atomic_cmpxchg(&queue->sig_count, v, v - 1);
+ if (old == v)
+ return false;
+ } else {
+ int new_count;
+
+ new_count = nvme_rdma_init_sig_count(queue->queue_size);
+ old = atomic_cmpxchg(&queue->sig_count, v, new_count);
+ if (old == v)
+ return true;
+ }
+ v = old;
+ }
+}
+
Ugh, no...
How about just do:
if (atomic_inc_return(queue->sig_count) % queue->sig_limit)
return true;
return false;
where
queue->sig_limit = max(queue->queue_size / 2, 1);
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