linux-hardening - [PATCH v1 6/9] kunit: memcpy: Mark tests as slow using test attributes

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Date:   Wed, 19 Jul 2023 22:23:33 +0000
From:   Rae Moar <rmoar@...gle.com>
To:     shuah@...nel.org, davidgow@...gle.com, dlatypov@...gle.com,
        brendan.higgins@...ux.dev
Cc:     linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, keescook@...omium.org,
        linux-hardening@...r.kernel.org, jstultz@...gle.com,
        tglx@...utronix.de, sboyd@...nel.org, Rae Moar <rmoar@...gle.com>
Subject: [PATCH v1 6/9] kunit: memcpy: Mark tests as slow using test attributes

Mark slow memcpy KUnit tests using test attributes.

Tests marked as slow are as follows: memcpy_large_test, memmove_test,
memmove_large_test, and memmove_overlap_test. These tests were the slowest
of the memcpy tests and relatively slower to most other KUnit tests. Most
of these tests are already skipped when CONFIG_MEMCPY_SLOW_KUNIT_TEST is
not enabled.

These tests can now be filtered using the KUnit test attribute filtering
feature. Example: --filter "speed>slow". This will run only the tests that
have speeds faster than slow. The slow attribute will also be outputted in
KTAP.

Note: This patch is intended to replace the use of
CONFIG_MEMCPY_SLOW_KUNIT_TEST and to potentially deprecate this feature.
This patch does not remove the config option but does add a note to the
config definition commenting on this future shift.

Acked-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Rae Moar <rmoar@...gle.com>
---

Changes since RFC v2:
- No changes.
Changes since RFC v1:
- Added note under CONFIG_MEMCPY_SLOW_KUNIT_TEST.

 lib/Kconfig.debug  | 3 +++
 lib/memcpy_kunit.c | 8 ++++----
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 550cb967b668..1b3894e861f2 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2701,6 +2701,9 @@ config MEMCPY_SLOW_KUNIT_TEST
 	  and bit ranges. These can be very slow, so they are split out
 	  as a separate config, in case they need to be disabled.
 
+	  Note this config option will be replaced by the use of KUnit test
+	  attributes.
+
 config IS_SIGNED_TYPE_KUNIT_TEST
 	tristate "Test is_signed_type() macro" if !KUNIT_ALL_TESTS
 	depends on KUNIT
diff --git a/lib/memcpy_kunit.c b/lib/memcpy_kunit.c
index 887926f04731..440aee705ccc 100644
--- a/lib/memcpy_kunit.c
+++ b/lib/memcpy_kunit.c
@@ -551,10 +551,10 @@ static void strtomem_test(struct kunit *test)
 static struct kunit_case memcpy_test_cases[] = {
 	KUNIT_CASE(memset_test),
 	KUNIT_CASE(memcpy_test),
-	KUNIT_CASE(memcpy_large_test),
-	KUNIT_CASE(memmove_test),
-	KUNIT_CASE(memmove_large_test),
-	KUNIT_CASE(memmove_overlap_test),
+	KUNIT_CASE_SLOW(memcpy_large_test),
+	KUNIT_CASE_SLOW(memmove_test),
+	KUNIT_CASE_SLOW(memmove_large_test),
+	KUNIT_CASE_SLOW(memmove_overlap_test),
 	KUNIT_CASE(strtomem_test),
 	{}
 };
-- 
2.41.0.255.g8b1d071c50-goog