mm/swap.c: fix incomplete comment in lru_cache_add_inactive_or_unevictable()

Since commit 9c4e6b1a ("mm, mlock, vmscan: no more skipping
pagevecs"), unevictable pages do not goes directly back onto zone's
unevictable list.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Shakeel Butt <shakeelb@google.com>
Link: https://lkml.kernel.org/r/20200927122209.59328-1-linmiaohe@huawei.comSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/swap.c

@@ -481,9 +481,7 @@ EXPORT_SYMBOL(lru_cache_add);
  * @vma:   vma in which page is mapped for determining reclaimability
  *
  * Place @page on the inactive or unevictable LRU list, depending on its
- * evictability.  Note that if the page is not evictable, it goes
- * directly back onto it's zone's unevictable list, it does NOT use a
- * per cpu pagevec.
+ * evictability.
  */
 void lru_cache_add_inactive_or_unevictable(struct page *page,
 					 struct vm_area_struct *vma)