mm/damon/core: pass migrate_dests to damos_commit_dests()

damos_commit_dests() receives 'struct damos' pointers, while it uses only
their ->migrate_dests fields.  This makes code unnecessarily difficult to
read.  It also makes unit tests writing complicated.  Refactor the
function to receive pointers to the ->migrate_dests fields.

Link: https://lkml.kernel.org/r/20251111184415.141757-9-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 17 insertions, 21 deletions

diff --git a/mm/damon/core.c b/mm/damon/core.c
index 06ad359024ad..a14cc73c2cab 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1000,36 +1000,32 @@ static void damos_set_filters_default_reject(struct damos *s)
 		damos_filters_default_reject(&s->ops_filters);
 }
 
-static int damos_commit_dests(struct damos *dst, struct damos *src)
+static int damos_commit_dests(struct damos_migrate_dests *dst,
+		struct damos_migrate_dests *src)
 {
-	struct damos_migrate_dests *dst_dests, *src_dests;
+	if (dst->nr_dests != src->nr_dests) {
+		kfree(dst->node_id_arr);
+		kfree(dst->weight_arr);
 
-	dst_dests = &dst->migrate_dests;
-	src_dests = &src->migrate_dests;
-
-	if (dst_dests->nr_dests != src_dests->nr_dests) {
-		kfree(dst_dests->node_id_arr);
-		kfree(dst_dests->weight_arr);
-
-		dst_dests->node_id_arr = kmalloc_array(src_dests->nr_dests,
-			sizeof(*dst_dests->node_id_arr), GFP_KERNEL);
-		if (!dst_dests->node_id_arr) {
-			dst_dests->weight_arr = NULL;
+		dst->node_id_arr = kmalloc_array(src->nr_dests,
+			sizeof(*dst->node_id_arr), GFP_KERNEL);
+		if (!dst->node_id_arr) {
+			dst->weight_arr = NULL;
 			return -ENOMEM;
 		}
 
-		dst_dests->weight_arr = kmalloc_array(src_dests->nr_dests,
-			sizeof(*dst_dests->weight_arr), GFP_KERNEL);
-		if (!dst_dests->weight_arr) {
+		dst->weight_arr = kmalloc_array(src->nr_dests,
+			sizeof(*dst->weight_arr), GFP_KERNEL);
+		if (!dst->weight_arr) {
 			/* ->node_id_arr will be freed by scheme destruction */
 			return -ENOMEM;
 		}
 	}
 
-	dst_dests->nr_dests = src_dests->nr_dests;
-	for (int i = 0; i < src_dests->nr_dests; i++) {
-		dst_dests->node_id_arr[i] = src_dests->node_id_arr[i];
-		dst_dests->weight_arr[i] = src_dests->weight_arr[i];
+	dst->nr_dests = src->nr_dests;
+	for (int i = 0; i < src->nr_dests; i++) {
+		dst->node_id_arr[i] = src->node_id_arr[i];
+		dst->weight_arr[i] = src->weight_arr[i];
 	}
 
 	return 0;
@@ -1076,7 +1072,7 @@ static int damos_commit(struct damos *dst, struct damos *src)
 	dst->wmarks = src->wmarks;
 	dst->target_nid = src->target_nid;
 
-	err = damos_commit_dests(dst, src);
+	err = damos_commit_dests(&dst->migrate_dests, &src->migrate_dests);
 	if (err)
 		return err;