Merge tag 'io_uring-5.16-2021-11-09' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:
 "Minor fixes that should go into the 5.16 release:

   - Fix max worker setting not working correctly on NUMA (Beld)

   - Correctly return current setting for max workers if zeroes are
     passed in (Pavel)

   - io_queue_sqe_arm_apoll() cleanup, as identified during the initial
     merge (Pavel)

   - Misc fixes (Nghia, me)"

* tag 'io_uring-5.16-2021-11-09' of git://git.kernel.dk/linux-block:
  io_uring: honour zeroes as io-wq worker limits
  io_uring: remove dead 'sqe' store
  io_uring: remove redundant assignment to ret in io_register_iowq_max_workers()
  io-wq: fix max-workers not correctly set on multi-node system
  io_uring: clean up io_queue_sqe_arm_apoll

Author: torvalds

fs/io-wq.c

@@ -1308,7 +1308,9 @@ int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask)
  */
 int io_wq_max_workers(struct io_wq *wq, int *new_count)
 {
-	int i, node, prev = 0;
+	int prev[IO_WQ_ACCT_NR];
+	bool first_node = true;
+	int i, node;
 
 	BUILD_BUG_ON((int) IO_WQ_ACCT_BOUND   != (int) IO_WQ_BOUND);
 	BUILD_BUG_ON((int) IO_WQ_ACCT_UNBOUND != (int) IO_WQ_UNBOUND);
@@ -1319,6 +1321,9 @@ int io_wq_max_workers(struct io_wq *wq, int *new_count)
 			new_count[i] = task_rlimit(current, RLIMIT_NPROC);
 	}
 
+	for (i = 0; i < IO_WQ_ACCT_NR; i++)
+		prev[i] = 0;
+
 	rcu_read_lock();
 	for_each_node(node) {
 		struct io_wqe *wqe = wq->wqes[node];
@@ -1327,14 +1332,19 @@ int io_wq_max_workers(struct io_wq *wq, int *new_count)
 		raw_spin_lock(&wqe->lock);
 		for (i = 0; i < IO_WQ_ACCT_NR; i++) {
 			acct = &wqe->acct[i];
-			prev = max_t(int, acct->max_workers, prev);
+			if (first_node)
+				prev[i] = max_t(int, acct->max_workers, prev[i]);
 			if (new_count[i])
 				acct->max_workers = new_count[i];
-			new_count[i] = prev;
 		}
 		raw_spin_unlock(&wqe->lock);
+		first_node = false;
 	}
 	rcu_read_unlock();
+
+	for (i = 0; i < IO_WQ_ACCT_NR; i++)
+		new_count[i] = prev[i];
+
 	return 0;
 }
 

fs/io_uring.c

@@ -6950,10 +6950,6 @@ static void io_queue_sqe_arm_apoll(struct io_kiocb *req)
 
 	switch (io_arm_poll_handler(req)) {
 	case IO_APOLL_READY:
-		if (linked_timeout) {
-			io_queue_linked_timeout(linked_timeout);
-			linked_timeout = NULL;
-		}
 		io_req_task_queue(req);
 		break;
 	case IO_APOLL_ABORTED:
@@ -10144,7 +10140,7 @@ static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx,
 	for (i = 0; i < sq_entries; i++) {
 		unsigned int entry = i + sq_head;
 		unsigned int sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]);
-		struct io_uring_sqe *sqe = &ctx->sq_sqes[sq_idx];
+		struct io_uring_sqe *sqe;
 
 		if (sq_idx > sq_mask)
 			continue;
@@ -10795,10 +10791,11 @@ static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx,
 
 	BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits));
 
-	memcpy(ctx->iowq_limits, new_count, sizeof(new_count));
+	for (i = 0; i < ARRAY_SIZE(new_count); i++)
+		if (new_count[i])
+			ctx->iowq_limits[i] = new_count[i];
 	ctx->iowq_limits_set = true;
 
-	ret = -EINVAL;
 	if (tctx && tctx->io_wq) {
 		ret = io_wq_max_workers(tctx->io_wq, new_count);
 		if (ret)