From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 include/linux/mm_inline.h | 103 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 include/linux/mm_inline.h

(limited to 'include/linux/mm_inline.h')

diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
new file mode 100644
index 000000000..cf55945c8
--- /dev/null
+++ b/include/linux/mm_inline.h
@@ -0,0 +1,103 @@
+#ifndef LINUX_MM_INLINE_H
+#define LINUX_MM_INLINE_H
+
+#include <linux/huge_mm.h>
+#include <linux/swap.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 __always_inline void add_page_to_lru_list(struct page *page,
+				struct lruvec *lruvec, enum lru_list lru)
+{
+	int nr_pages = hpage_nr_pages(page);
+	mem_cgroup_update_lru_size(lruvec, lru, nr_pages);
+	list_add(&page->lru, &lruvec->lists[lru]);
+	__mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, nr_pages);
+}
+
+static __always_inline void del_page_from_lru_list(struct page *page,
+				struct lruvec *lruvec, enum lru_list lru)
+{
+	int nr_pages = hpage_nr_pages(page);
+	mem_cgroup_update_lru_size(lruvec, lru, -nr_pages);
+	list_del(&page->lru);
+	__mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, -nr_pages);
+}
+
+/**
+ * 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;
+}
+
+/**
+ * page_off_lru - which LRU list was page on? clearing its lru flags.
+ * @page: the page to test
+ *
+ * Returns the LRU list a page was on, as an index into the array of LRU
+ * lists; and clears its Unevictable or Active flags, ready for freeing.
+ */
+static __always_inline enum lru_list page_off_lru(struct page *page)
+{
+	enum lru_list lru;
+
+	if (PageUnevictable(page)) {
+		__ClearPageUnevictable(page);
+		lru = LRU_UNEVICTABLE;
+	} else {
+		lru = page_lru_base_type(page);
+		if (PageActive(page)) {
+			__ClearPageActive(page);
+			lru += LRU_ACTIVE;
+		}
+	}
+	return lru;
+}
+
+/**
+ * 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 __always_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
-- 
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