{
BUG_ON(count > DQL_MAX_OBJECT);
- dql->num_queued += count;
dql->last_obj_cnt = count;
+
+ /* We want to force a write first, so that cpu do not attempt
+ * to get cache line containing last_obj_cnt, num_queued, adj_limit
+ * in Shared state, but directly does a Request For Ownership
+ * It is only a hint, we use barrier() only.
+ */
+ barrier();
+
+ dql->num_queued += count;
}
/* Returns how many objects can be queued, < 0 indicates over limit. */
static inline int dql_avail(const struct dql *dql)
{
- return dql->adj_limit - dql->num_queued;
+ return ACCESS_ONCE(dql->adj_limit) - ACCESS_ONCE(dql->num_queued);
}
/* Record number of completed objects and recalculate the limit. */