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mm/damon/tests/core-kunit: add a test for damos_set_filters_default_reject() 

DAMOS filters' default reject behavior is not very simple.  Actually there
was a mistake[1] during the development.  Add a kunit test for validating
the behavior.

Link: https://lkml.kernel.org/r/20250513002715.40126-5-sj@kernel.org
Link: https://lore.kernel.org/20250227002913.19359-1-sj@kernel.org [1]
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2025-05-12 17:27:13 -07:00 committed by Andrew Morton
parent a82cf30010
commit 094fb14913
1 changed files with 70 additions and 0 deletions
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70
mm/damon/tests/core-kunit.h
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@ -510,6 +510,75 @@ static void damon_test_feed_loop_next_input(struct kunit *test)
damon_feed_loop_next_input(last_input, 2000));
}
static void damon_test_set_filters_default_reject(struct kunit *test)
{
struct damos scheme;
struct damos_filter *target_filter, *anon_filter;
INIT_LIST_HEAD(&scheme.filters);
INIT_LIST_HEAD(&scheme.ops_filters);
damos_set_filters_default_reject(&scheme);
/*
* No filter is installed. Allow by default on both core and ops layer
* filtering stages, since there are no filters at all.
*/
KUNIT_EXPECT_EQ(test, scheme.core_filters_default_reject, false);
KUNIT_EXPECT_EQ(test, scheme.ops_filters_default_reject, false);
target_filter = damos_new_filter(DAMOS_FILTER_TYPE_TARGET, true, true);
damos_add_filter(&scheme, target_filter);
damos_set_filters_default_reject(&scheme);
/*
* A core-handled allow-filter is installed.
* Rejct by default on core layer filtering stage due to the last
* core-layer-filter's behavior.
* Allow by default on ops layer filtering stage due to the absence of
* ops layer filters.
*/
KUNIT_EXPECT_EQ(test, scheme.core_filters_default_reject, true);
KUNIT_EXPECT_EQ(test, scheme.ops_filters_default_reject, false);
target_filter->allow = false;
damos_set_filters_default_reject(&scheme);
/*
* A core-handled reject-filter is installed.
* Allow by default on core layer filtering stage due to the last
* core-layer-filter's behavior.
* Allow by default on ops layer filtering stage due to the absence of
* ops layer filters.
*/
KUNIT_EXPECT_EQ(test, scheme.core_filters_default_reject, false);
KUNIT_EXPECT_EQ(test, scheme.ops_filters_default_reject, false);
anon_filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true, true);
damos_add_filter(&scheme, anon_filter);
damos_set_filters_default_reject(&scheme);
/*
* A core-handled reject-filter and ops-handled allow-filter are installed.
* Allow by default on core layer filtering stage due to the existence
* of the ops-handled filter.
* Reject by default on ops layer filtering stage due to the last
* ops-layer-filter's behavior.
*/
KUNIT_EXPECT_EQ(test, scheme.core_filters_default_reject, false);
KUNIT_EXPECT_EQ(test, scheme.ops_filters_default_reject, true);
target_filter->allow = true;
damos_set_filters_default_reject(&scheme);
/*
* A core-handled allow-filter and ops-handled allow-filter are
* installed.
* Allow by default on core layer filtering stage due to the existence
* of the ops-handled filter.
* Reject by default on ops layer filtering stage due to the last
* ops-layer-filter's behavior.
*/
KUNIT_EXPECT_EQ(test, scheme.core_filters_default_reject, false);
KUNIT_EXPECT_EQ(test, scheme.ops_filters_default_reject, true);
}
static struct kunit_case damon_test_cases[] = {
KUNIT_CASE(damon_test_target),
KUNIT_CASE(damon_test_regions),
@ -527,6 +596,7 @@ static struct kunit_case damon_test_cases[] = {
KUNIT_CASE(damos_test_new_filter),
KUNIT_CASE(damos_test_filter_out),
KUNIT_CASE(damon_test_feed_loop_next_input),
KUNIT_CASE(damon_test_set_filters_default_reject),
{},
};