1 files changed, 24 insertions, 0 deletions

diff --git a/mm/swap.c b/mm/swap.c
index e3045040dc3e..88a394872677 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -428,6 +428,30 @@ void pagevec_strip(struct pagevec *pvec)
 }
 
 /**
+ * pagevec_swap_free - try to free swap space from the pages in a pagevec
+ * @pvec: pagevec with swapcache pages to free the swap space of
+ *
+ * The caller needs to hold an extra reference to each page and
+ * not hold the page lock on the pages.  This function uses a
+ * trylock on the page lock so it may not always free the swap
+ * space associated with a page.
+ */
+void pagevec_swap_free(struct pagevec *pvec)
+{
+        int i;
+
+        for (i = 0; i < pagevec_count(pvec); i++) {
+                struct page *page = pvec->pages[i];
+
+                if (PageSwapCache(page) && trylock_page(page)) {
+                        if (PageSwapCache(page))
+                                remove_exclusive_swap_page_ref(page);
+                        unlock_page(page);
+                }
+        }
+}
+
+/**
  * pagevec_lookup - gang pagecache lookup
  * @pvec:       Where the resulting pages are placed
  * @mapping:    The address_space to search