Re: [PATCH -next 1/6] blk-wbt: fix that wbt can't be disabled by default

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Hi,

在 2023/05/11 23:19, Christoph Hellwig 写道:
On Thu, May 11, 2023 at 09:45:04AM +0800, Yu Kuai wrote:
@@ -730,8 +730,9 @@ void wbt_enable_default(struct gendisk *disk)
  {
  	struct request_queue *q = disk->queue;
  	struct rq_qos *rqos;
-	bool disable_flag = q->elevator &&
-		    test_bit(ELEVATOR_FLAG_DISABLE_WBT, &q->elevator->flags);
+	bool disable_flag = (q->elevator &&
+		    test_bit(ELEVATOR_FLAG_DISABLE_WBT, &q->elevator->flags)) ||
+		    !IS_ENABLED(CONFIG_BLK_WBT_MQ);

Not really new in your patch, but I find the logic here very confusing.
First the disable_flag really should be enable instead, as that's how
it's actually checked, and then spelling out the conditions a bit more
would really help readability.  E.g.

	bool enabled = IS_ENABLED(CONFIG_BLK_WBT_MQ);

	if (q->elevator &&
	    test_bit(ELEVATOR_FLAG_DISABLE_WBT, &q->elevator->flags))
		enable = false;

Of course, this looks better, I'll do this in v2.

Thanks,
Kuai


.





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