[PATCH -next v2] mm: make use of the helper macro LIST_HEAD()

[Hongbo Li <lihongbo22@huawei.com>]

list_head can be initialized automatically with LIST_HEAD()
instead of calling INIT_LIST_HEAD(). Here we can simplify
the code.

Signed-off-by: Hongbo Li <lihongbo22@huawei.com>

---
- v2:
  - Also adjust decay_list according to Uladzislau's suggestion.

- v1: https://lore.kernel.org/linux-mm/20240827015724.620110-1-lihongbo22@huawei.com/T/
---
 mm/vmalloc.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 3f9b6bd707d2..6fc736f74ae7 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2131,23 +2131,18 @@ reclaim_list_global(struct list_head *head)
 static void
 decay_va_pool_node(struct vmap_node *vn, bool full_decay)
 {
+	LIST_HEAD(decay_list);
+	struct rb_root decay_root = RB_ROOT;
 	struct vmap_area *va, *nva;
-	struct list_head decay_list;
-	struct rb_root decay_root;
 	unsigned long n_decay;
 	int i;
 
-	decay_root = RB_ROOT;
-	INIT_LIST_HEAD(&decay_list);
-
 	for (i = 0; i < MAX_VA_SIZE_PAGES; i++) {
-		struct list_head tmp_list;
+		LIST_HEAD(tmp_list);
 
 		if (list_empty(&vn->pool[i].head))
 			continue;
 
-		INIT_LIST_HEAD(&tmp_list);
-
 		/* Detach the pool, so no-one can access it. */
 		spin_lock(&vn->pool_lock);
 		list_replace_init(&vn->pool[i].head, &tmp_list);
-- 
2.34.1