The quilt patch titled
Subject: mm/damon/core-test: test max_nr_accesses overflow caused divide-by-zero
has been removed from the -mm tree. Its filename was
mm-damon-core-test-test-max_nr_accesses-overflow-caused-divide-by-zero.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: mm/damon/core-test: test max_nr_accesses overflow caused divide-by-zero
Date: Wed, 13 Dec 2023 19:03:34 +0000
Commit 35f5d94187a6 ("mm/damon: implement a function for max nr_accesses
safe calculation") has fixed an overflow bug that could cause
divide-by-zero. Add a kunit test for the bug to ensure similar bugs are
not introduced again.
Link: https://lkml.kernel.org/r/20231213190338.54146-3-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/damon/core-test.h | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/mm/damon/core-test.h~mm-damon-core-test-test-max_nr_accesses-overflow-caused-divide-by-zero
+++ a/mm/damon/core-test.h
@@ -302,6 +302,16 @@ static void damon_test_set_regions(struc
damon_destroy_target(t);
}
+static void damon_test_nr_accesses_to_accesses_bp(struct kunit *test)
+{
+ struct damon_attrs attrs = {
+ .sample_interval = 10,
+ .aggr_interval = ((unsigned long)UINT_MAX + 1) * 10
+ };
+
+ KUNIT_EXPECT_EQ(test, damon_nr_accesses_to_accesses_bp(123, &attrs), 0);
+}
+
static void damon_test_update_monitoring_result(struct kunit *test)
{
struct damon_attrs old_attrs = {
@@ -487,6 +497,7 @@ static struct kunit_case damon_test_case
KUNIT_CASE(damon_test_split_regions_of),
KUNIT_CASE(damon_test_ops_registration),
KUNIT_CASE(damon_test_set_regions),
+ KUNIT_CASE(damon_test_nr_accesses_to_accesses_bp),
KUNIT_CASE(damon_test_update_monitoring_result),
KUNIT_CASE(damon_test_set_attrs),
KUNIT_CASE(damon_test_moving_sum),
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
