staging: erofs: staticize erofs_shrink_count, erofs_shrink_scan

Move erofs_shrinker_info to utils.c and therefore
no need to globalize erofs_shrink_count and erofs_shrink_scan.
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/erofs/internal.h

@@ -589,10 +589,7 @@ extern struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp);
 extern void erofs_register_super(struct super_block *sb);
 extern void erofs_unregister_super(struct super_block *sb);
 
-extern unsigned long erofs_shrink_count(struct shrinker *shrink,
-	struct shrink_control *sc);
-extern unsigned long erofs_shrink_scan(struct shrinker *shrink,
-	struct shrink_control *sc);
+extern struct shrinker erofs_shrinker_info;
 
 #ifndef lru_to_page
 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))

drivers/staging/erofs/super.c

@@ -539,12 +539,6 @@ static void erofs_kill_sb(struct super_block *sb)
 	kill_block_super(sb);
 }
 
-static struct shrinker erofs_shrinker_info = {
-	.scan_objects = erofs_shrink_scan,
-	.count_objects = erofs_shrink_count,
-	.seeks = DEFAULT_SEEKS,
-};
-
 static struct file_system_type erofs_fs_type = {
 	.owner          = THIS_MODULE,
 	.name           = "erofs",

drivers/staging/erofs/utils.c

@@ -270,14 +270,14 @@ void erofs_unregister_super(struct super_block *sb)
 	spin_unlock(&erofs_sb_list_lock);
 }
 
-unsigned long erofs_shrink_count(struct shrinker *shrink,
-				 struct shrink_control *sc)
+static unsigned long erofs_shrink_count(struct shrinker *shrink,
+					struct shrink_control *sc)
 {
 	return atomic_long_read(&erofs_global_shrink_cnt);
 }
 
-unsigned long erofs_shrink_scan(struct shrinker *shrink,
-				struct shrink_control *sc)
+static unsigned long erofs_shrink_scan(struct shrinker *shrink,
+				       struct shrink_control *sc)
 {
 	struct erofs_sb_info *sbi;
 	struct list_head *p;
@@ -333,3 +333,9 @@ unsigned long erofs_shrink_scan(struct shrinker *shrink,
 	return freed;
 }
 
+struct shrinker erofs_shrinker_info = {
+	.scan_objects = erofs_shrink_scan,
+	.count_objects = erofs_shrink_count,
+	.seeks = DEFAULT_SEEKS,
+};
+