tcp: take care of truncations done by sk_filter()

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / balloon_compaction.h

diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h
index f7f1d7169b11c332612ba09a1663141870e08849..089743ade734fc564e18bfa7be35608da68d6fde 100644 (file)
--- a/include/linux/balloon_compaction.h
+++ b/include/linux/balloon_compaction.h
@@ -158,6 +158,26 @@ static inline bool balloon_page_movable(struct page *page)
        return false;
 }
 
+/*
+ * isolated_balloon_page - identify an isolated balloon page on private
+ *                        compaction/migration page lists.
+ *
+ * After a compaction thread isolates a balloon page for migration, it raises
+ * the page refcount to prevent concurrent compaction threads from re-isolating
+ * the same page. For that reason putback_movable_pages(), or other routines
+ * that need to identify isolated balloon pages on private pagelists, cannot
+ * rely on balloon_page_movable() to accomplish the task.
+ */
+static inline bool isolated_balloon_page(struct page *page)
+{
+       /* Already isolated balloon pages, by default, have a raised refcount */
+       if (page_flags_cleared(page) && !page_mapped(page) &&
+           page_count(page) >= 2)
+               return __is_movable_balloon_page(page);
+
+       return false;
+}
+
 /*
  * balloon_page_insert - insert a page into the balloon's page list and make
  *                      the page->mapping assignment accordingly.
@@ -243,6 +263,11 @@ static inline bool balloon_page_movable(struct page *page)
        return false;
 }
 
+static inline bool isolated_balloon_page(struct page *page)
+{
+       return false;
+}
+
 static inline bool balloon_page_isolate(struct page *page)
 {
        return false;