1 files changed, 104 insertions, 0 deletions
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
new file mode 100644
index 00000000..8f7d2471
--- /dev/null
+++ b/include/linux/mm_inline.h
@@ -0,0 +1,104 @@
+#ifndef LINUX_MM_INLINE_H
+#define LINUX_MM_INLINE_H
+
+#include <linux/huge_mm.h>
+
+/**
+ * page_is_file_cache - should the page be on a file LRU or anon LRU?
+ * @page: the page to test
+ *
+ * Returns 1 if @page is page cache page backed by a regular filesystem,
+ * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
+ * Used by functions that manipulate the LRU lists, to sort a page
+ * onto the right LRU list.
+ *
+ * We would like to get this info without a page flag, but the state
+ * needs to survive until the page is last deleted from the LRU, which
+ * could be as far down as __page_cache_release.
+ */
+static inline int page_is_file_cache(struct page *page)
+{
+	return !PageSwapBacked(page);
+}
+
+static inline void
+__add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l,
+		       struct list_head *head)
+{
+	list_add(&page->lru, head);
+	__mod_zone_page_state(zone, NR_LRU_BASE + l, hpage_nr_pages(page));
+	mem_cgroup_add_lru_list(page, l);
+}
+
+static inline void
+add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l)
+{
+	__add_page_to_lru_list(zone, page, l, &zone->lru[l].list);
+}
+
+static inline void
+del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l)
+{
+	list_del(&page->lru);
+	__mod_zone_page_state(zone, NR_LRU_BASE + l, -hpage_nr_pages(page));
+	mem_cgroup_del_lru_list(page, l);
+}
+
+/**
+ * page_lru_base_type - which LRU list type should a page be on?
+ * @page: the page to test
+ *
+ * Used for LRU list index arithmetic.
+ *
+ * Returns the base LRU type - file or anon - @page should be on.
+ */
+static inline enum lru_list page_lru_base_type(struct page *page)
+{
+	if (page_is_file_cache(page))
+		return LRU_INACTIVE_FILE;
+	return LRU_INACTIVE_ANON;
+}
+
+static inline void
+del_page_from_lru(struct zone *zone, struct page *page)
+{
+	enum lru_list l;
+
+	list_del(&page->lru);
+	if (PageUnevictable(page)) {
+		__ClearPageUnevictable(page);
+		l = LRU_UNEVICTABLE;
+	} else {
+		l = page_lru_base_type(page);
+		if (PageActive(page)) {
+			__ClearPageActive(page);
+			l += LRU_ACTIVE;
+		}
+	}
+	__mod_zone_page_state(zone, NR_LRU_BASE + l, -hpage_nr_pages(page));
+	mem_cgroup_del_lru_list(page, l);
+}
+
+/**
+ * page_lru - which LRU list should a page be on?
+ * @page: the page to test
+ *
+ * Returns the LRU list a page should be on, as an index
+ * into the array of LRU lists.
+ */
+static inline enum lru_list page_lru(struct page *page)
+{
+	enum lru_list lru;
+
+	if (PageUnevictable(page))
+		lru = LRU_UNEVICTABLE;
+	else {
+		lru = page_lru_base_type(page);
+		if (PageActive(page))
+			lru += LRU_ACTIVE;
+	}
+
+	return lru;
+}
+
+#endif