[PATCH] mm: set_page_refs opt

Inline set_page_refs.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 17 insertions, 2 deletions

diff --git a/mm/internal.h b/mm/internal.h
index 6bf134e8fb3d..85004f540e34 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -9,5 +9,20 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-/* page_alloc.c */
-extern void set_page_refs(struct page *page, int order);
+static inline void set_page_refs(struct page *page, int order)
+{
+#ifdef CONFIG_MMU
+        set_page_count(page, 1);
+#else
+        int i;
+
+        /*
+         * We need to reference all the pages for this order, otherwise if
+         * anyone accesses one of the pages with (get/put) it will be freed.
+         * - eg: access_process_vm()
+         */
+        for (i = 0; i < (1 << order); i++)
+                set_page_count(page + i, 1);
+#endif /* CONFIG_MMU */
+}
+