1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8a8563359946..76c97cb8ee9a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1927,6 +1927,21 @@ static inline bool page_is_pfmemalloc(const struct page *page)
 }
 
 /*
+ * Return true only if the folio 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 folio_is_pfmemalloc(const struct folio *folio)
+{
+	/*
+	 * lru.next has bit 1 set if the page is allocated from the
+	 * pfmemalloc reserves.  Callers may simply overwrite it if
+	 * they do not need to preserve that information.
+	 */
+	return (uintptr_t)folio->lru.next & BIT(1);
+}
+
+/*
  * Only to be called by the page allocator on a freshly allocated
  * page.
  */