linux-kernel - [PATCH 4/5] blk-iolatency: use new helper blkg_print_dev

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Message-Id: <20240930085302.1558217-5-yukuai1@huaweicloud.com>
Date: Mon, 30 Sep 2024 16:53:01 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: axboe@...nel.dk,
	tj@...nel.org,
	josef@...icpanda.com
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org,
	yukuai3@...wei.com,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH 4/5] blk-iolatency: use new helper blkg_print_dev_name()

From: Yu Kuai <yukuai3@...wei.com>

To avoid abuse of bdi_dev_name().

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 block/blk-iolatency.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index ebb522788d97..9c9ab4a73e0b 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -898,12 +898,15 @@ static u64 iolatency_prfill_limit(struct seq_file *sf,
 				  struct blkg_policy_data *pd, int off)
 {
 	struct iolatency_grp *iolat = pd_to_lat(pd);
-	const char *dname = blkg_dev_name(pd->blkg);
 
-	if (!dname || !iolat->min_lat_nsec)
+	if (!iolat->min_lat_nsec)
 		return 0;
-	seq_printf(sf, "%s target=%llu\n",
-		   dname, div_u64(iolat->min_lat_nsec, NSEC_PER_USEC));
+
+	if (!blkg_print_dev_name(sf, pd->blkg))
+		return 0;
+
+	seq_printf(sf, " target=%llu\n",
+		   div_u64(iolat->min_lat_nsec, NSEC_PER_USEC));
 	return 0;
 }
 
-- 
2.39.2