mm/damon/tests/core-kunit: add test cases for multiple regions in damon_test_split_re...

Extend damon_test_split_regions_of() to verify that it correctly handles
multiple regions with various 'min_sz_region'.

[sj@kernel.org: remove braces in damon_test_split_regions_of()]
Link: https://lkml.kernel.org/r/20251224153125.69194-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20251224042200.2061847-5-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 2eb6f41635a879d897737a9caab12f4d4e7ccf05..252ce3e001c893e0b178ffe926bab9bd030aefff 100644 (file)
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -275,6 +275,9 @@ static void damon_test_split_regions_of(struct kunit *test)
 {
        struct damon_target *t;
        struct damon_region *r;
+       unsigned long sa[] = {0, 300, 500};
+       unsigned long ea[] = {220, 400, 700};
+       int i;
 
        t = damon_new_target();
        if (!t)
@@ -301,6 +304,23 @@ static void damon_test_split_regions_of(struct kunit *test)
        damon_split_regions_of(t, 4, 1);
        KUNIT_EXPECT_LE(test, damon_nr_regions(t), 4u);
        damon_free_target(t);
+
+       t = damon_new_target();
+       if (!t)
+               kunit_skip(test, "third target alloc fail");
+       for (i = 0; i < ARRAY_SIZE(sa); i++) {
+               r = damon_new_region(sa[i], ea[i]);
+               if (!r) {
+                       damon_free_target(t);
+                       kunit_skip(test, "region alloc fail");
+               }
+               damon_add_region(r, t);
+       }
+       damon_split_regions_of(t, 4, 5);
+       KUNIT_EXPECT_LE(test, damon_nr_regions(t), 12u);
+       damon_for_each_region(r, t)
+               KUNIT_EXPECT_GE(test, damon_sz_region(r) % 5ul, 0ul);
+       damon_free_target(t);
 }
 
 static void damon_test_ops_registration(struct kunit *test)