mm/damon/tests/core-kunit: add a test case for region merge size limit in damon_test_...

Add a test case in damon_test_merge_regions_of() to verify that two
adjacent regions are not merged if the resulting region would exceed the
specified size limit.

Link: https://lkml.kernel.org/r/20251224042200.2061847-4-shu17az@gmail.com
Signed-off-by: Shu Anzai <shu17az@gmail.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 6e301113e103bbee0fab0bc6fab59815d4b9a5cc..2eb6f41635a879d897737a9caab12f4d4e7ccf05 100644 (file)
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -238,12 +238,12 @@ static void damon_test_merge_regions_of(struct kunit *test)
 {
        struct damon_target *t;
        struct damon_region *r;
-       unsigned long sa[] = {0, 100, 114, 122, 130, 156, 170, 184};
-       unsigned long ea[] = {100, 112, 122, 130, 156, 170, 184, 230};
-       unsigned int nrs[] = {0, 0, 10, 10, 20, 30, 1, 2};
+       unsigned long sa[] = {0, 100, 114, 122, 130, 156, 170, 184, 230};
+       unsigned long ea[] = {100, 112, 122, 130, 156, 170, 184, 230, 10170};
+       unsigned int nrs[] = {0, 0, 10, 10, 20, 30, 1, 2, 5};
 
-       unsigned long saddrs[] = {0, 114, 130, 156, 170};
-       unsigned long eaddrs[] = {112, 130, 156, 170, 230};
+       unsigned long saddrs[] = {0, 114, 130, 156, 170, 230};
+       unsigned long eaddrs[] = {112, 130, 156, 170, 230, 10170};
        int i;
 
        t = damon_new_target();
@@ -261,9 +261,9 @@ static void damon_test_merge_regions_of(struct kunit *test)
        }
 
        damon_merge_regions_of(t, 9, 9999);
-       /* 0-112, 114-130, 130-156, 156-170 */
-       KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 5u);
-       for (i = 0; i < 5; i++) {
+       /* 0-112, 114-130, 130-156, 156-170, 170-230, 230-10170 */
+       KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 6u);
+       for (i = 0; i < 6; i++) {
                r = __nth_region_of(t, i);
                KUNIT_EXPECT_EQ(test, r->ar.start, saddrs[i]);
                KUNIT_EXPECT_EQ(test, r->ar.end, eaddrs[i]);