linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / mm / internal.h

diff --git a/mm/internal.h b/mm/internal.h
index d20e3cc..17256bb 100644 (file)
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -8,33 +8,23 @@
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  */
-#ifndef __MM_INTERNAL_H
-#define __MM_INTERNAL_H
 
-#include <linux/mm.h>
-
-static inline void set_page_count(struct page *page, int v)
-{
-       atomic_set(&page->_count, v);
-}
-
-/*
- * Turn a non-refcounted page (->_count == 0) into refcounted with
- * a count of one.
- */
-static inline void set_page_refcounted(struct page *page)
+static inline void set_page_refs(struct page *page, int order)
 {
-       BUG_ON(PageCompound(page) && page_private(page) != (unsigned long)page);
-       BUG_ON(atomic_read(&page->_count));
+#ifdef CONFIG_MMU
        set_page_count(page, 1);
-}
+#else
+       int i;
 
-static inline void __put_page(struct page *page)
-{
-       atomic_dec(&page->_count);
+       /*
+        * 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 */
 }
 
 extern void fastcall __init __free_pages_bootmem(struct page *page,
                                                unsigned int order);
-
-#endif