linux-kernel - [PATCH V2] Revert "blk-throttle: Fix IO hang for a corner case"

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Message-ID: <20241016024508.3340330-1-xiuhong.wang@unisoc.com>
Date: Wed, 16 Oct 2024 10:45:08 +0800
From: Xiuhong Wang <xiuhong.wang@...soc.com>
To: <tj@...nel.org>, <josef@...icpanda.com>, <axboe@...nel.dk>,
        <cgroups@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: <niuzhiguo84@...il.com>, <ke.wang@...soc.com>, <xiuhong.wang.cn@...il.com>
Subject: [PATCH V2] Revert "blk-throttle: Fix IO hang for a corner case"

This reverts commit 5b7048b89745c3c5fb4b3080fb7bced61dba2a2b.

The main purpose of this patch is cleanup.
The throtl_adjusted_limit function was removed after
commit bf20ab538c81 ("blk-throttle: remove
CONFIG_BLK_DEV_THROTTLING_LOW"), so the problem of not being
able to scale after setting bps or iops to 1 will not occur.
So revert this commit that bps/iops can be set to 1.

Cc: Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc: Yu Kuai <yukuai3@...wei.com>
Signed-off-by: Xiuhong Wang <xiuhong.wang@...soc.com>
Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com>
Acked-by: Tejun Heo <tj@...nel.org>
Reviewed-by: Yu Kuai <yukuai3@...wei.com>
---
V1 -> V2: Updated description to clarify this is mostly a cleanup
---
 block/blk-throttle.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 2c4192e12efa..443d1f47c2ce 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1485,13 +1485,13 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
 			goto out_finish;
 
 		ret = -EINVAL;
-		if (!strcmp(tok, "rbps") && val > 1)
+		if (!strcmp(tok, "rbps"))
 			v[0] = val;
-		else if (!strcmp(tok, "wbps") && val > 1)
+		else if (!strcmp(tok, "wbps"))
 			v[1] = val;
-		else if (!strcmp(tok, "riops") && val > 1)
+		else if (!strcmp(tok, "riops"))
 			v[2] = min_t(u64, val, UINT_MAX);
-		else if (!strcmp(tok, "wiops") && val > 1)
+		else if (!strcmp(tok, "wiops"))
 			v[3] = min_t(u64, val, UINT_MAX);
 		else
 			goto out_finish;
-- 
2.25.1