mm/zsmalloc: remove_zspage() don't need fullness parameter

We must remove_zspage() from its current fullness list, then use
insert_zspage() to update its fullness and insert to new fullness list. 
Obviously, remove_zspage() doesn't need the fullness parameter.

Link: https://lkml.kernel.org/r/20240220-b4-zsmalloc-cleanup-v1-2-5c5ee4ccdd87@bytedance.comSigned-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/zsmalloc.c

@@ -687,10 +687,10 @@ static void insert_zspage(struct size_class *class,
  * This function removes the given zspage from the freelist identified
  * by <class, fullness_group>.
  */
-static void remove_zspage(struct size_class *class,
-				struct zspage *zspage,
-				int fullness)
+static void remove_zspage(struct size_class *class, struct zspage *zspage)
 {
+	int fullness = zspage->fullness;
+
 	VM_BUG_ON(list_empty(&class->fullness_list[fullness]));
 
 	list_del_init(&zspage->list);
@@ -716,7 +716,7 @@ static int fix_fullness_group(struct size_class *class, struct zspage *zspage)
 	if (newfg == currfg)
 		goto out;
 
-	remove_zspage(class, zspage, currfg);
+	remove_zspage(class, zspage);
 	insert_zspage(class, zspage, newfg);
 out:
 	return newfg;
@@ -878,7 +878,7 @@ static void free_zspage(struct zs_pool *pool, struct size_class *class,
 		return;
 	}
 
-	remove_zspage(class, zspage, ZS_INUSE_RATIO_0);
+	remove_zspage(class, zspage);
 	__free_zspage(pool, class, zspage);
 }
 
@@ -1609,7 +1609,7 @@ static struct zspage *isolate_src_zspage(struct size_class *class)
 		zspage = list_first_entry_or_null(&class->fullness_list[fg],
 						  struct zspage, list);
 		if (zspage) {
-			remove_zspage(class, zspage, fg);
+			remove_zspage(class, zspage);
 			return zspage;
 		}
 	}
@@ -1626,7 +1626,7 @@ static struct zspage *isolate_dst_zspage(struct size_class *class)
 		zspage = list_first_entry_or_null(&class->fullness_list[fg],
 						  struct zspage, list);
 		if (zspage) {
-			remove_zspage(class, zspage, fg);
+			remove_zspage(class, zspage);
 			return zspage;
 		}
 	}