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-rw-r--r--include/linux/mm.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2e872f92dbac..bf6f117fcf4d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1003,6 +1003,34 @@ static inline int page_mapped(struct page *page)
}
/*
+ * 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
* just gets major/minor fault counters bumped up.