X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;f=mm%2Finternal.h;h=91d1d3828093af01a48e657093750782de7d7090;hb=9c315e4d7d8c3bddad3893777bbab4164b298818;hp=3cf20ab3ca01f31db206a92ad3dd0d0fd22e0119;hpb=7347f09a198a045d5f6ea5e9c8fcc1db98e5a854;p=linux-2.6-microblaze.git

diff --git a/mm/internal.h b/mm/internal.h
index 3cf20ab3ca01..91d1d3828093 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -63,6 +63,29 @@ static inline unsigned long ra_submit(struct file_ra_state *ra,
 					ra->start, ra->size, ra->async_size);
 }
 
+/**
+ * page_evictable - test whether a page is evictable
+ * @page: the page to test
+ *
+ * Test whether page is evictable--i.e., should be placed on active/inactive
+ * lists vs unevictable list.
+ *
+ * Reasons page might not be evictable:
+ * (1) page's mapping marked unevictable
+ * (2) page is part of an mlocked VMA
+ *
+ */
+static inline bool page_evictable(struct page *page)
+{
+	bool ret;
+
+	/* Prevent address_space of inode and swap cache from being freed */
+	rcu_read_lock();
+	ret = !mapping_unevictable(page_mapping(page)) && !PageMlocked(page);
+	rcu_read_unlock();
+	return ret;
+}
+
 /*
  * Turn a non-refcounted page (->_refcount == 0) into refcounted with
  * a count of one.