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From: Feng Jiang <jiangfeng@kylinos.cn>
To: pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu,
	alex@ghiti.fr, akpm@linux-foundation.org, kees@kernel.org,
	andy@kernel.org, jiangfeng@kylinos.cn, ebiggers@kernel.org,
	martin.petersen@oracle.com, mingo@kernel.org,
	charlie@rivosinc.com, conor.dooley@microchip.com,
	samuel.holland@sifive.com, linus.walleij@linaro.org,
	nathan@kernel.org
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-hardening@vger.kernel.org, Joel Stanley <joel@jms.id.au>
Subject: [PATCH v4 1/8] lib/string_kunit: add correctness test for strlen()
Date: Fri, 23 Jan 2026 16:58:34 +0800	[thread overview]
Message-ID: <20260123085841.212468-2-jiangfeng@kylinos.cn> (raw)
In-Reply-To: <20260123085841.212468-1-jiangfeng@kylinos.cn>

Add a KUnit test for strlen() to verify correctness across
different string lengths and memory alignments.

Signed-off-by: Feng Jiang <jiangfeng@kylinos.cn>
Acked-by: Andy Shevchenko <andy@kernel.org>
Tested-by: Joel Stanley <joel@jms.id.au>
---
 lib/tests/string_kunit.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/lib/tests/string_kunit.c b/lib/tests/string_kunit.c
index f9a8e557ba77..bc5130c6e5e9 100644
--- a/lib/tests/string_kunit.c
+++ b/lib/tests/string_kunit.c
@@ -17,6 +17,9 @@
 #define STRCMP_TEST_EXPECT_LOWER(test, fn, ...) KUNIT_EXPECT_LT(test, fn(__VA_ARGS__), 0)
 #define STRCMP_TEST_EXPECT_GREATER(test, fn, ...) KUNIT_EXPECT_GT(test, fn(__VA_ARGS__), 0)
 
+#define STRING_TEST_MAX_LEN	128
+#define STRING_TEST_MAX_OFFSET	16
+
 static void string_test_memset16(struct kunit *test)
 {
 	unsigned i, j, k;
@@ -104,6 +107,28 @@ static void string_test_memset64(struct kunit *test)
 	}
 }
 
+static void string_test_strlen(struct kunit *test)
+{
+	const size_t buf_size = STRING_TEST_MAX_LEN + STRING_TEST_MAX_OFFSET + 1;
+	size_t len, offset;
+	char *s;
+
+	s = kunit_kzalloc(test, buf_size, GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, s);
+
+	memset(s, 'A', buf_size);
+	s[buf_size - 1] = '\0';
+
+	for (offset = 0; offset < STRING_TEST_MAX_OFFSET; offset++) {
+		for (len = 0; len <= STRING_TEST_MAX_LEN; len++) {
+			s[offset + len] = '\0';
+			KUNIT_EXPECT_EQ_MSG(test, strlen(s + offset), len,
+				"offset:%zu len:%zu", offset, len);
+			s[offset + len] = 'A';
+		}
+	}
+}
+
 static void string_test_strchr(struct kunit *test)
 {
 	const char *test_string = "abcdefghijkl";
@@ -618,6 +643,7 @@ static struct kunit_case string_test_cases[] = {
 	KUNIT_CASE(string_test_memset16),
 	KUNIT_CASE(string_test_memset32),
 	KUNIT_CASE(string_test_memset64),
+	KUNIT_CASE(string_test_strlen),
 	KUNIT_CASE(string_test_strchr),
 	KUNIT_CASE(string_test_strnchr),
 	KUNIT_CASE(string_test_strspn),
-- 
2.25.1


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  reply	other threads:[~2026-01-23  8:59 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-01-23  8:58 [PATCH v4 0/8] riscv: optimize string functions and add kunit tests Feng Jiang
2026-01-23  8:58 ` Feng Jiang [this message]
2026-01-23  8:58 ` [PATCH v4 2/8] lib/string_kunit: add correctness test for strnlen() Feng Jiang
2026-01-23  8:58 ` [PATCH v4 3/8] lib/string_kunit: add correctness test for strrchr() Feng Jiang
2026-01-23  8:58 ` [PATCH v4 4/8] lib/string_kunit: add performance benchmark for strlen() Feng Jiang
2026-01-23 11:02   ` Andy Shevchenko
2026-01-26  6:14     ` Feng Jiang
2026-01-26  9:28       ` Andy Shevchenko
2026-01-23  8:58 ` [PATCH v4 5/8] lib/string_kunit: extend benchmarks to strnlen() and chr searches Feng Jiang
2026-01-23  8:58 ` [PATCH v4 6/8] riscv: lib: add strnlen() implementation Feng Jiang
2026-01-23  8:58 ` [PATCH v4 7/8] riscv: lib: add strchr() implementation Feng Jiang
2026-01-23  8:58 ` [PATCH v4 8/8] riscv: lib: add strrchr() implementation Feng Jiang

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