From e73bcb3708a69369d506e5bc6a63d4fc13d8e28a Mon Sep 17 00:00:00 2001 From: Feng Jiang Date: Fri, 3 Apr 2026 19:28:47 -0600 Subject: [PATCH] lib/string_kunit: extend benchmarks to strnlen() and chr searches Extend the string benchmarking suite to include strnlen(), strchr(), and strrchr(). For character search functions strchr() and strrchr(), the benchmark targets the NUL character. This ensures the entire string is scanned, providing a consistent measure of full-length processing efficiency comparable to strlen(). Suggested-by: Andy Shevchenko Suggested-by: Eric Biggers Signed-off-by: Feng Jiang Acked-by: Andy Shevchenko Reviewed-by: Kees Cook Link: https://patch.msgid.link/20260130025018.172925-6-jiangfeng@kylinos.cn Signed-off-by: Paul Walmsley --- lib/tests/string_kunit.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/lib/tests/string_kunit.c b/lib/tests/string_kunit.c index cd5837373427..0819ace5b027 100644 --- a/lib/tests/string_kunit.c +++ b/lib/tests/string_kunit.c @@ -866,6 +866,21 @@ static void string_bench_strlen(struct kunit *test) STRING_BENCH_BUF(test, buf, len, strlen, buf); } +static void string_bench_strnlen(struct kunit *test) +{ + STRING_BENCH_BUF(test, buf, len, strnlen, buf, len); +} + +static void string_bench_strchr(struct kunit *test) +{ + STRING_BENCH_BUF(test, buf, len, strchr, buf, '\0'); +} + +static void string_bench_strrchr(struct kunit *test) +{ + STRING_BENCH_BUF(test, buf, len, strrchr, buf, '\0'); +} + static struct kunit_case string_test_cases[] = { KUNIT_CASE(string_test_memset16), KUNIT_CASE(string_test_memset32), @@ -892,6 +907,9 @@ static struct kunit_case string_test_cases[] = { KUNIT_CASE(string_test_memtostr), KUNIT_CASE(string_test_strends), KUNIT_CASE(string_bench_strlen), + KUNIT_CASE(string_bench_strnlen), + KUNIT_CASE(string_bench_strchr), + KUNIT_CASE(string_bench_strrchr), {} }; -- 2.47.3