mm/zsmalloc.c: migration can leave pages in ZS_EMPTY indefinitely

[sfrench/cifs-2.6.git] / mm / zsmalloc.c

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 57fbb7ced69f3a47111db0f665ec05b26e4186db..5105b9b666537970160001095aa0174820f2a4ed 100644 (file)
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1862,6 +1862,18 @@ static void dec_zspage_isolation(struct zspage *zspage)
        zspage->isolated--;
 }
 
+static void putback_zspage_deferred(struct zs_pool *pool,
+                                   struct size_class *class,
+                                   struct zspage *zspage)
+{
+       enum fullness_group fg;
+
+       fg = putback_zspage(class, zspage);
+       if (fg == ZS_EMPTY)
+               schedule_work(&pool->free_work);
+
+}
+
 static void replace_sub_page(struct size_class *class, struct zspage *zspage,
                                struct page *newpage, struct page *oldpage)
 {
@@ -2031,7 +2043,7 @@ static int zs_page_migrate(struct address_space *mapping, struct page *newpage,
         * the list if @page is final isolated subpage in the zspage.
         */
        if (!is_zspage_isolated(zspage))
-               putback_zspage(class, zspage);
+               putback_zspage_deferred(pool, class, zspage);
 
        reset_page(page);
        put_page(page);
@@ -2077,14 +2089,13 @@ static void zs_page_putback(struct page *page)
        spin_lock(&class->lock);
        dec_zspage_isolation(zspage);
        if (!is_zspage_isolated(zspage)) {
-               fg = putback_zspage(class, zspage);
                /*
                 * Due to page_lock, we cannot free zspage immediately
                 * so let's defer.
                 */
-               if (fg == ZS_EMPTY)
-                       schedule_work(&pool->free_work);
+               putback_zspage_deferred(pool, class, zspage);
        }
+
        spin_unlock(&class->lock);
 }