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lib/string_kunit: extend benchmarks to strnlen() and chr searches

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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 <andy@kernel.org>
Suggested-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Feng Jiang <jiangfeng@kylinos.cn>
Acked-by: Andy Shevchenko <andy@kernel.org>
Reviewed-by: Kees Cook <kees@kernel.org>
Link: https://patch.msgid.link/20260130025018.172925-6-jiangfeng@kylinos.cn
Signed-off-by: Paul Walmsley <pjw@kernel.org>
This commit is contained in:
Feng Jiang 2026-04-03 19:28:47 -06:00 committed by Paul Walmsley
parent 0020240a43
commit e73bcb3708
1 changed files with 18 additions and 0 deletions
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18
lib/tests/string_kunit.c
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@ -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),
{}
};