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From: Yu Kuai <yukuai3@huawei.com>
To: <hch@infradead.org>, <tj@kernel.org>, <axboe@kernel.dk>
Cc: <cgroups@vger.kernel.org>, <linux-block@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <yukuai3@huawei.com>,
	<yi.zhang@huawei.com>
Subject: [PATCH v2 1/2] blk-throtl: move WARN_ON_ONCE() from throtl_rb_first() to it's caller
Date: Tue, 30 Nov 2021 09:17:29 +0800	[thread overview]
Message-ID: <20211130011730.2584339-2-yukuai3@huawei.com> (raw)
In-Reply-To: <20211130011730.2584339-1-yukuai3@huawei.com>

Prepare to reintroduce tg_drain_bios(), which will iterate until
throtl_rb_first() return NULL.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 block/blk-throttle.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 39bb6e68a9a2..f7244190cb2f 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -502,7 +502,6 @@ throtl_rb_first(struct throtl_service_queue *parent_sq)
 	struct rb_node *n;
 
 	n = rb_first_cached(&parent_sq->pending_tree);
-	WARN_ON_ONCE(!n);
 	if (!n)
 		return NULL;
 	return rb_entry_tg(n);
@@ -521,8 +520,10 @@ static void update_min_dispatch_time(struct throtl_service_queue *parent_sq)
 	struct throtl_grp *tg;
 
 	tg = throtl_rb_first(parent_sq);
-	if (!tg)
+	if (!tg) {
+		WARN_ON_ONCE(1);
 		return;
+	}
 
 	parent_sq->first_pending_disptime = tg->disptime;
 }
@@ -1090,8 +1091,10 @@ static int throtl_select_dispatch(struct throtl_service_queue *parent_sq)
 			break;
 
 		tg = throtl_rb_first(parent_sq);
-		if (!tg)
+		if (!tg) {
+			WARN_ON_ONCE(1);
 			break;
+		}
 
 		if (time_before(jiffies, tg->disptime))
 			break;
-- 
2.31.1


WARNING: multiple messages have this Message-ID (diff)
From: Yu Kuai <yukuai3@huawei.com>
To: hch@infradead.org, tj@kernel.org, axboe@kernel.dk
Cc: cgroups@vger.kernel.org, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org, yukuai3@huawei.com,
	yi.zhang@huawei.com
Subject: [PATCH v2 1/2] blk-throtl: move WARN_ON_ONCE() from throtl_rb_first() to it's caller
Date: Tue, 30 Nov 2021 09:17:29 +0800	[thread overview]
Message-ID: <20211130011730.2584339-2-yukuai3@huawei.com> (raw)
In-Reply-To: <20211130011730.2584339-1-yukuai3@huawei.com>

Prepare to reintroduce tg_drain_bios(), which will iterate until
throtl_rb_first() return NULL.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 block/blk-throttle.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 39bb6e68a9a2..f7244190cb2f 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -502,7 +502,6 @@ throtl_rb_first(struct throtl_service_queue *parent_sq)
 	struct rb_node *n;
 
 	n = rb_first_cached(&parent_sq->pending_tree);
-	WARN_ON_ONCE(!n);
 	if (!n)
 		return NULL;
 	return rb_entry_tg(n);
@@ -521,8 +520,10 @@ static void update_min_dispatch_time(struct throtl_service_queue *parent_sq)
 	struct throtl_grp *tg;
 
 	tg = throtl_rb_first(parent_sq);
-	if (!tg)
+	if (!tg) {
+		WARN_ON_ONCE(1);
 		return;
+	}
 
 	parent_sq->first_pending_disptime = tg->disptime;
 }
@@ -1090,8 +1091,10 @@ static int throtl_select_dispatch(struct throtl_service_queue *parent_sq)
 			break;
 
 		tg = throtl_rb_first(parent_sq);
-		if (!tg)
+		if (!tg) {
+			WARN_ON_ONCE(1);
 			break;
+		}
 
 		if (time_before(jiffies, tg->disptime))
 			break;
-- 
2.31.1


  reply	other threads:[~2021-11-30  1:05 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-30  1:17 [PATCH v2 0/2] cancel all throttled bios in del_gendisk() Yu Kuai
2021-11-30  1:17 ` Yu Kuai
2021-11-30  1:17 ` Yu Kuai [this message]
2021-11-30  1:17   ` [PATCH v2 1/2] blk-throtl: move WARN_ON_ONCE() from throtl_rb_first() to it's caller Yu Kuai
2021-11-30  6:43   ` Christoph Hellwig
2021-11-30  6:43     ` Christoph Hellwig
2021-11-30  1:17 ` [PATCH v2 2/2] block: cancel all throttled bios in del_gendisk() Yu Kuai
2021-11-30  1:17   ` Yu Kuai
2021-11-30  6:43   ` Christoph Hellwig
2021-11-30 16:26   ` Tejun Heo
2021-12-01  9:26     ` yukuai (C)
2021-12-01  9:26       ` yukuai (C)

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