mm/damon/tests/core-kunit: remove DAMON_MIN_REGION redefinition

A few DAMON core functions including damon_set_regions() were hard-coded
to use DAMON_MIN_REGION as their regions management granularity.  For
simple and human-readable unit tests' expectations, DAMON core layer kunit
test re-defines DAMON_MIN_REGION to '1'.

A previous patch series [1] has removed the hard-coded part but kept the
redefinition and updated related function calls to explicitly use
DAMON_MIN_REGION.  Remove the unnecessary redefinition and update relevant
function calls to pass literals (number '1') instead of the
DAMON_MIN_REGION.

Link: https://lkml.kernel.org/r/20251112154114.66053-7-sj@kernel.org
Link: https://lore.kernel.org/20250828171242.59810-1-sj@kernel.org [1]
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Bill Wendling <morbo@google.com>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

2 files changed, 26 insertions, 34 deletions

diff --git a/mm/damon/core.c b/mm/damon/core.c
index aedb315b075a..f9fc0375890a 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -20,11 +20,6 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/damon.h>
 
-#ifdef CONFIG_DAMON_KUNIT_TEST
-#undef DAMON_MIN_REGION
-#define DAMON_MIN_REGION 1
-#endif
-
 static DEFINE_MUTEX(damon_lock);
 static int nr_running_ctxs;
 static bool running_exclusive_ctxs;
diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 4380d0312d24..a1eff023e928 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -279,7 +279,7 @@ static void damon_test_split_regions_of(struct kunit *test)
 		kunit_skip(test, "region alloc fail");
 	}
 	damon_add_region(r, t);
-	damon_split_regions_of(t, 2, DAMON_MIN_REGION);
+	damon_split_regions_of(t, 2, 1);
 	KUNIT_EXPECT_LE(test, damon_nr_regions(t), 2u);
 	damon_free_target(t);
 
@@ -292,7 +292,7 @@ static void damon_test_split_regions_of(struct kunit *test)
 		kunit_skip(test, "second region alloc fail");
 	}
 	damon_add_region(r, t);
-	damon_split_regions_of(t, 4, DAMON_MIN_REGION);
+	damon_split_regions_of(t, 4, 1);
 	KUNIT_EXPECT_LE(test, damon_nr_regions(t), 4u);
 	damon_free_target(t);
 }
@@ -373,7 +373,7 @@ static void damon_test_set_regions(struct kunit *test)
 
 	damon_add_region(r1, t);
 	damon_add_region(r2, t);
-	damon_set_regions(t, &range, 1, DAMON_MIN_REGION);
+	damon_set_regions(t, &range, 1, 1);
 
 	KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 3);
 	damon_for_each_region(r, t) {
@@ -1037,15 +1037,14 @@ static void damos_test_filter_out(struct kunit *test)
 	f = damos_new_filter(DAMOS_FILTER_TYPE_ADDR, true, false);
 	if (!f)
 		kunit_skip(test, "filter alloc fail");
-	f->addr_range = (struct damon_addr_range){
-		.start = DAMON_MIN_REGION * 2, .end = DAMON_MIN_REGION * 6};
+	f->addr_range = (struct damon_addr_range){.start = 2, .end = 6};
 
 	t = damon_new_target();
 	if (!t) {
 		damos_destroy_filter(f);
 		kunit_skip(test, "target alloc fail");
 	}
-	r = damon_new_region(DAMON_MIN_REGION * 3, DAMON_MIN_REGION * 5);
+	r = damon_new_region(3, 5);
 	if (!r) {
 		damos_destroy_filter(f);
 		damon_free_target(t);
@@ -1054,50 +1053,48 @@ static void damos_test_filter_out(struct kunit *test)
 	damon_add_region(r, t);
 
 	/* region in the range */
-	KUNIT_EXPECT_TRUE(test,
-			damos_filter_match(NULL, t, r, f, DAMON_MIN_REGION));
+	KUNIT_EXPECT_TRUE(test, damos_filter_match(NULL, t, r, f, 1));
 	KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1);
 
 	/* region before the range */
-	r->ar.start = DAMON_MIN_REGION * 1;
-	r->ar.end = DAMON_MIN_REGION * 2;
+	r->ar.start = 1;
+	r->ar.end = 2;
 	KUNIT_EXPECT_FALSE(test,
-			damos_filter_match(NULL, t, r, f, DAMON_MIN_REGION));
+			damos_filter_match(NULL, t, r, f, 1));
 	KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1);
 
 	/* region after the range */
-	r->ar.start = DAMON_MIN_REGION * 6;
-	r->ar.end = DAMON_MIN_REGION * 8;
+	r->ar.start = 6;
+	r->ar.end = 8;
 	KUNIT_EXPECT_FALSE(test,
-			damos_filter_match(NULL, t, r, f, DAMON_MIN_REGION));
+			damos_filter_match(NULL, t, r, f, 1));
 	KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1);
 
 	/* region started before the range */
-	r->ar.start = DAMON_MIN_REGION * 1;
-	r->ar.end = DAMON_MIN_REGION * 4;
-	KUNIT_EXPECT_FALSE(test,
-			damos_filter_match(NULL, t, r, f, DAMON_MIN_REGION));
+	r->ar.start = 1;
+	r->ar.end = 4;
+	KUNIT_EXPECT_FALSE(test, damos_filter_match(NULL, t, r, f, 1));
 	/* filter should have split the region */
-	KUNIT_EXPECT_EQ(test, r->ar.start, DAMON_MIN_REGION * 1);
-	KUNIT_EXPECT_EQ(test, r->ar.end, DAMON_MIN_REGION * 2);
+	KUNIT_EXPECT_EQ(test, r->ar.start, 1);
+	KUNIT_EXPECT_EQ(test, r->ar.end, 2);
 	KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 2);
 	r2 = damon_next_region(r);
-	KUNIT_EXPECT_EQ(test, r2->ar.start, DAMON_MIN_REGION * 2);
-	KUNIT_EXPECT_EQ(test, r2->ar.end, DAMON_MIN_REGION * 4);
+	KUNIT_EXPECT_EQ(test, r2->ar.start, 2);
+	KUNIT_EXPECT_EQ(test, r2->ar.end, 4);
 	damon_destroy_region(r2, t);
 
 	/* region started in the range */
-	r->ar.start = DAMON_MIN_REGION * 2;
-	r->ar.end = DAMON_MIN_REGION * 8;
+	r->ar.start = 2;
+	r->ar.end = 8;
 	KUNIT_EXPECT_TRUE(test,
-			damos_filter_match(NULL, t, r, f, DAMON_MIN_REGION));
+			damos_filter_match(NULL, t, r, f, 1));
 	/* filter should have split the region */
-	KUNIT_EXPECT_EQ(test, r->ar.start, DAMON_MIN_REGION * 2);
-	KUNIT_EXPECT_EQ(test, r->ar.end, DAMON_MIN_REGION * 6);
+	KUNIT_EXPECT_EQ(test, r->ar.start, 2);
+	KUNIT_EXPECT_EQ(test, r->ar.end, 6);
 	KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 2);
 	r2 = damon_next_region(r);
-	KUNIT_EXPECT_EQ(test, r2->ar.start, DAMON_MIN_REGION * 6);
-	KUNIT_EXPECT_EQ(test, r2->ar.end, DAMON_MIN_REGION * 8);
+	KUNIT_EXPECT_EQ(test, r2->ar.start, 6);
+	KUNIT_EXPECT_EQ(test, r2->ar.end, 8);
 	damon_destroy_region(r2, t);
 
 	damon_free_target(t);