mm/z3fold: use helper function put_z3fold_locked() and put_z3fold_locked_list()

This code is already duplicated six times, use helper function
put_z3fold_locked() to release z3fold page instead of open code it to help
improve code readability a bit.  And add put_z3fold_locked_list() helper
function to be consistent with it.  No functional change involved.

Link: https://lkml.kernel.org/r/20230803113824.886413-1-ruanjinjie@huawei.comSigned-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/z3fold.c

@@ -480,6 +480,16 @@ static void release_z3fold_page_locked_list(struct kref *ref)
 	__release_z3fold_page(zhdr, true);
 }
 
+static inline int put_z3fold_locked(struct z3fold_header *zhdr)
+{
+	return kref_put(&zhdr->refcount, release_z3fold_page_locked);
+}
+
+static inline int put_z3fold_locked_list(struct z3fold_header *zhdr)
+{
+	return kref_put(&zhdr->refcount, release_z3fold_page_locked_list);
+}
+
 static void free_pages_work(struct work_struct *w)
 {
 	struct z3fold_pool *pool = container_of(w, struct z3fold_pool, work);
@@ -666,7 +676,7 @@ static struct z3fold_header *compact_single_buddy(struct z3fold_header *zhdr)
 	return new_zhdr;
 
 out_fail:
-	if (new_zhdr && !kref_put(&new_zhdr->refcount, release_z3fold_page_locked)) {
+	if (new_zhdr && !put_z3fold_locked(new_zhdr)) {
 		add_to_unbuddied(pool, new_zhdr);
 		z3fold_page_unlock(new_zhdr);
 	}
@@ -741,7 +751,7 @@ static void do_compact_page(struct z3fold_header *zhdr, bool locked)
 	list_del_init(&zhdr->buddy);
 	spin_unlock(&pool->lock);
 
-	if (kref_put(&zhdr->refcount, release_z3fold_page_locked))
+	if (put_z3fold_locked(zhdr))
 		return;
 
 	if (test_bit(PAGE_STALE, &page->private) ||
@@ -752,7 +762,7 @@ static void do_compact_page(struct z3fold_header *zhdr, bool locked)
 
 	if (!zhdr->foreign_handles && buddy_single(zhdr) &&
 	    zhdr->mapped_count == 0 && compact_single_buddy(zhdr)) {
-		if (!kref_put(&zhdr->refcount, release_z3fold_page_locked)) {
+		if (!put_z3fold_locked(zhdr)) {
 			clear_bit(PAGE_CLAIMED, &page->private);
 			z3fold_page_unlock(zhdr);
 		}
@@ -878,7 +888,7 @@ static inline struct z3fold_header *__z3fold_alloc(struct z3fold_pool *pool,
 	return zhdr;
 
 out_fail:
-	if (!kref_put(&zhdr->refcount, release_z3fold_page_locked)) {
+	if (!put_z3fold_locked(zhdr)) {
 		add_to_unbuddied(pool, zhdr);
 		z3fold_page_unlock(zhdr);
 	}
@@ -1012,8 +1022,7 @@ static int z3fold_alloc(struct z3fold_pool *pool, size_t size, gfp_t gfp,
 		if (zhdr) {
 			bud = get_free_buddy(zhdr, chunks);
 			if (bud == HEADLESS) {
-				if (!kref_put(&zhdr->refcount,
-					     release_z3fold_page_locked))
+				if (!put_z3fold_locked(zhdr))
 					z3fold_page_unlock(zhdr);
 				pr_err("No free chunks in unbuddied\n");
 				WARN_ON(1);
@@ -1129,7 +1138,7 @@ static void z3fold_free(struct z3fold_pool *pool, unsigned long handle)
 
 	if (!page_claimed)
 		free_handle(handle, zhdr);
-	if (kref_put(&zhdr->refcount, release_z3fold_page_locked_list))
+	if (put_z3fold_locked_list(zhdr))
 		return;
 	if (page_claimed) {
 		/* the page has not been claimed by us */
@@ -1346,7 +1355,7 @@ static void z3fold_page_putback(struct page *page)
 	if (!list_empty(&zhdr->buddy))
 		list_del_init(&zhdr->buddy);
 	INIT_LIST_HEAD(&page->lru);
-	if (kref_put(&zhdr->refcount, release_z3fold_page_locked))
+	if (put_z3fold_locked(zhdr))
 		return;
 	if (list_empty(&zhdr->buddy))
 		add_to_unbuddied(pool, zhdr);