linux-kernel - [PATCH v3 5/5] blk-iocost: change div64_u64 to DIV64_U64_ROUND_UP in ioc_refresh

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Date:   Mon, 26 Dec 2022 16:58:59 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     tj@...nel.org, josef@...icpanda.com, axboe@...nel.dk
Cc:     cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, yukuai3@...wei.com,
        yukuai1@...weicloud.com, yi.zhang@...wei.com
Subject: [PATCH v3 5/5] blk-iocost: change div64_u64 to DIV64_U64_ROUND_UP in ioc_refresh_params()

From: Li Nan <linan122@...wei.com>

vrate_min is calculated by DIV64_U64_ROUND_UP, but vrate_max is calculated
by div64_u64. Vrate_min may be 1 greater than vrate_max if the input
values min and max of cost.qos are equal.

Signed-off-by: Li Nan <linan122@...wei.com>
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 block/blk-iocost.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index c6b39024117b..7a0d754b9eb2 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -930,8 +930,8 @@ static bool ioc_refresh_params(struct ioc *ioc, bool force)
 
 	ioc->vrate_min = DIV64_U64_ROUND_UP((u64)ioc->params.qos[QOS_MIN] *
 					    VTIME_PER_USEC, MILLION);
-	ioc->vrate_max = div64_u64((u64)ioc->params.qos[QOS_MAX] *
-				   VTIME_PER_USEC, MILLION);
+	ioc->vrate_max = DIV64_U64_ROUND_UP((u64)ioc->params.qos[QOS_MAX] *
+					    VTIME_PER_USEC, MILLION);
 
 	return true;
 }
-- 
2.31.1