Merge tag 'char-misc-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...

[deliverable/linux.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2e872f92dbac0cecc2c5b3a65fbe7ff8678e48d5..bf6f117fcf4d80cb7de6147e86c6ba19fa13febd 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1002,6 +1002,34 @@ static inline int page_mapped(struct page *page)
        return atomic_read(&(page)->_mapcount) >= 0;
 }
 
+/*
+ * Return true only if the page has been allocated with
+ * ALLOC_NO_WATERMARKS and the low watermark was not
+ * met implying that the system is under some pressure.
+ */
+static inline bool page_is_pfmemalloc(struct page *page)
+{
+       /*
+        * Page index cannot be this large so this must be
+        * a pfmemalloc page.
+        */
+       return page->index == -1UL;
+}
+
+/*
+ * Only to be called by the page allocator on a freshly allocated
+ * page.
+ */
+static inline void set_page_pfmemalloc(struct page *page)
+{
+       page->index = -1UL;
+}
+
+static inline void clear_page_pfmemalloc(struct page *page)
+{
+       page->index = 0;
+}
+
 /*
  * Different kinds of faults, as returned by handle_mm_fault().
  * Used to decide whether a process gets delivered SIGBUS or