linux-kernel - [PATCH] selftests: ublk: Use ARRAY

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Message-ID: <aKGihYui6/Pcijbk@bhairav-test.ee.iitb.ac.in>
Date: Sun, 17 Aug 2025 15:06:05 +0530
From: Akhilesh Patil <akhilesh@...iitb.ac.in>
To: ming.lei@...hat.com, shuah@...nel.org, axboe@...nel.dk
Cc: linux-block@...r.kernel.org, linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org, akhileshpatilvnit@...il.com
Subject: [PATCH] selftests: ublk: Use ARRAY_SIZE() macro to improve code

Use ARRAY_SIZE() macro while calculating size of an array to improve
code readability and reduce potential sizing errors.
Implement this suggestion given by spatch tool by running
coccinelle script - scripts/coccinelle/misc/array_size.cocci
Follow ARRAY_SIZE() macro usage pattern in ublk.c introduced by,
commit ec120093180b9 ("selftests: ublk: fix ublk_find_tgt()")
wherever appropriate to maintain consistency.

Signed-off-by: Akhilesh Patil <akhilesh@...iitb.ac.in>
---
Testing:
* build checked for testing/selftests/ublk
* tested by running 
	$ ./kublk --help
Which exercises the impacted code path.

 tools/testing/selftests/ublk/kublk.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/ublk/kublk.c b/tools/testing/selftests/ublk/kublk.c
index 95188065b2e9..6512dfbdbce3 100644
--- a/tools/testing/selftests/ublk/kublk.c
+++ b/tools/testing/selftests/ublk/kublk.c
@@ -1400,7 +1400,7 @@ static int cmd_dev_get_features(void)
 
 			if (!((1ULL << i)  & features))
 				continue;
-			if (i < sizeof(feat_map) / sizeof(feat_map[0]))
+			if (i < ARRAY_SIZE(feat_map))
 				feat = feat_map[i];
 			else
 				feat = "unknown";
@@ -1477,7 +1477,7 @@ static void __cmd_create_help(char *exe, bool recovery)
 	printf("\tdefault: nr_queues=2(max 32), depth=128(max 1024), dev_id=-1(auto allocation)\n");
 	printf("\tdefault: nthreads=nr_queues");
 
-	for (i = 0; i < sizeof(tgt_ops_list) / sizeof(tgt_ops_list[0]); i++) {
+	for (i = 0; i < ARRAY_SIZE(tgt_ops_list); i++) {
 		const struct ublk_tgt_ops *ops = tgt_ops_list[i];
 
 		if (ops->usage)
-- 
2.34.1