[PATCH] block: add a new flag BLK_MQ_POLL_HYBRID_INVALID for hybrid poll

[Yufen Yu <yuyufen@huawei.com>]

For q->poll_nsec == -1, means using classic poll, not hybrid poll.
We introduce a new flag BLK_POLL_DELAY_INVALID to replace -1, which
may make code much easier to read.

Signed-off-by: Yufen Yu <yuyufen@huawei.com>
---
 block/blk-mq.c         | 4 ++--
 block/blk-sysfs.c      | 4 ++--
 include/linux/blkdev.h | 3 +++
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 9437a5eb07cf..8df9f6e97d2e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2857,7 +2857,7 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
 	/*
 	 * Default to classic polling
 	 */
-	q->poll_nsec = -1;
+	q->poll_nsec = BLK_MQ_POLL_HYBRID_INVALID;
 
 	blk_mq_init_cpu_queues(q, set->nr_hw_queues);
 	blk_mq_add_queue_tag_set(set, q);
@@ -3389,7 +3389,7 @@ static bool blk_mq_poll_hybrid(struct request_queue *q,
 {
 	struct request *rq;
 
-	if (q->poll_nsec == -1)
+	if (q->poll_nsec == BLK_MQ_POLL_HYBRID_INVALID)
 		return false;
 
 	if (!blk_qc_t_is_internal(cookie))
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 590d1ef2f961..8775b898f96d 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -360,7 +360,7 @@ static ssize_t queue_poll_delay_show(struct request_queue *q, char *page)
 {
 	int val;
 
-	if (q->poll_nsec == -1)
+	if (q->poll_nsec == BLK_MQ_POLL_HYBRID_INVALID)
 		val = -1;
 	else
 		val = q->poll_nsec / 1000;
@@ -381,7 +381,7 @@ static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page,
 		return err;
 
 	if (val == -1)
-		q->poll_nsec = -1;
+		q->poll_nsec = BLK_MQ_POLL_HYBRID_INVALID;
 	else
 		q->poll_nsec = val * 1000;
 
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 338604dff7d0..2102447b67d9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -50,6 +50,9 @@ struct blk_stat_callback;
 /* Must be consistent with blk_mq_poll_stats_bkt() */
 #define BLK_MQ_POLL_STATS_BKTS 16
 
+/* Using default classic polling */
+#define BLK_MQ_POLL_HYBRID_INVALID -1
+
 /*
  * Maximum number of blkcg policies allowed to be registered concurrently.
  * Defined here to simplify include dependency.
-- 
2.16.2.dirty