mm/damon/vaddr-test: split a test function having >1024 bytes frame size

On some configuration[1], 'damon_test_split_evenly()' kunit test
function has >1024 bytes frame size, so below build warning is
triggered:

      CC      mm/damon/vaddr.o
    In file included from mm/damon/vaddr.c:672:
    mm/damon/vaddr-test.h: In function 'damon_test_split_evenly':
    mm/damon/vaddr-test.h:309:1: warning: the frame size of 1064 bytes is larger than 1024 bytes [-Wframe-larger-than=]
      309 | }
          | ^

This commit fixes the warning by separating the common logic in the
function.

[1] https://lore.kernel.org/linux-mm/202111182146.OV3C4uGr-lkp@intel.com/

Link: https://lkml.kernel.org/r/20211201150440.1088-6-sj@kernel.org
Fixes: 17ccae8bb5c9 ("mm/damon: add kunit tests")
Signed-off-by: SeongJae Park <sj@kernel.org>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/damon/vaddr-test.h b/mm/damon/vaddr-test.h
index ecfd0b2ed222d065d97e1061704ef0fa96e5ad51..3097ef9c662af96f3c17a5c4236b163b80bdc1d2 100644 (file)
--- a/mm/damon/vaddr-test.h
+++ b/mm/damon/vaddr-test.h
@@ -252,59 +252,62 @@ static void damon_test_apply_three_regions4(struct kunit *test)
                        new_three_regions, expected, ARRAY_SIZE(expected));
 }
 
-static void damon_test_split_evenly(struct kunit *test)
+static void damon_test_split_evenly_fail(struct kunit *test,
+               unsigned long start, unsigned long end, unsigned int nr_pieces)
 {
-       struct damon_ctx *c = damon_new_ctx();
-       struct damon_target *t;
-       struct damon_region *r;
-       unsigned long i;
-
-       KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(NULL, NULL, 5),
-                       -EINVAL);
-
-       t = damon_new_target(42);
-       r = damon_new_region(0, 100);
-       KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(t, r, 0), -EINVAL);
+       struct damon_target *t = damon_new_target(42);
+       struct damon_region *r = damon_new_region(start, end);
 
        damon_add_region(r, t);
-       KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(t, r, 10), 0);
-       KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 10u);
+       KUNIT_EXPECT_EQ(test,
+                       damon_va_evenly_split_region(t, r, nr_pieces), -EINVAL);
+       KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1u);
 
-       i = 0;
        damon_for_each_region(r, t) {
-               KUNIT_EXPECT_EQ(test, r->ar.start, i++ * 10);
-               KUNIT_EXPECT_EQ(test, r->ar.end, i * 10);
+               KUNIT_EXPECT_EQ(test, r->ar.start, start);
+               KUNIT_EXPECT_EQ(test, r->ar.end, end);
        }
+
        damon_free_target(t);
+}
+
+static void damon_test_split_evenly_succ(struct kunit *test,
+       unsigned long start, unsigned long end, unsigned int nr_pieces)
+{
+       struct damon_target *t = damon_new_target(42);
+       struct damon_region *r = damon_new_region(start, end);
+       unsigned long expected_width = (end - start) / nr_pieces;
+       unsigned long i = 0;
 
-       t = damon_new_target(42);
-       r = damon_new_region(5, 59);
        damon_add_region(r, t);
-       KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(t, r, 5), 0);
-       KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 5u);
+       KUNIT_EXPECT_EQ(test,
+                       damon_va_evenly_split_region(t, r, nr_pieces), 0);
+       KUNIT_EXPECT_EQ(test, damon_nr_regions(t), nr_pieces);
 
-       i = 0;
        damon_for_each_region(r, t) {
-               if (i == 4)
+               if (i == nr_pieces - 1)
                        break;
-               KUNIT_EXPECT_EQ(test, r->ar.start, 5 + 10 * i++);
-               KUNIT_EXPECT_EQ(test, r->ar.end, 5 + 10 * i);
+               KUNIT_EXPECT_EQ(test,
+                               r->ar.start, start + i++ * expected_width);
+               KUNIT_EXPECT_EQ(test, r->ar.end, start + i * expected_width);
        }
-       KUNIT_EXPECT_EQ(test, r->ar.start, 5 + 10 * i);
-       KUNIT_EXPECT_EQ(test, r->ar.end, 59ul);
+       KUNIT_EXPECT_EQ(test, r->ar.start, start + i * expected_width);
+       KUNIT_EXPECT_EQ(test, r->ar.end, end);
        damon_free_target(t);
+}
 
-       t = damon_new_target(42);
-       r = damon_new_region(5, 6);
-       damon_add_region(r, t);
-       KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(t, r, 2), -EINVAL);
-       KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1u);
+static void damon_test_split_evenly(struct kunit *test)
+{
+       struct damon_ctx *c = damon_new_ctx();
+
+       KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(NULL, NULL, 5),
+                       -EINVAL);
+
+       damon_test_split_evenly_fail(test, 0, 100, 0);
+       damon_test_split_evenly_succ(test, 0, 100, 10);
+       damon_test_split_evenly_succ(test, 5, 59, 5);
+       damon_test_split_evenly_fail(test, 5, 6, 2);
 
-       damon_for_each_region(r, t) {
-               KUNIT_EXPECT_EQ(test, r->ar.start, 5ul);
-               KUNIT_EXPECT_EQ(test, r->ar.end, 6ul);
-       }
-       damon_free_target(t);
        damon_destroy_ctx(c);
 }