VServer 1.9.2 (patch-2.6.8.1-vs1.9.2.diff)

[linux-2.6.git] / arch / sh / mm / pg-sh4.c

diff --git a/arch/sh/mm/pg-sh4.c b/arch/sh/mm/pg-sh4.c
index 07cbbd6..f6a7623 100644 (file)
--- a/arch/sh/mm/pg-sh4.c
+++ b/arch/sh/mm/pg-sh4.c
@@ -1,7 +1,5 @@
-/* 
- * $Id: pg-sh4.c,v 1.1.2.2 2002/11/17 17:56:18 lethal Exp $
- *
- *  arch/sh/mm/pg-sh4.c
+/*
+ * arch/sh/mm/pg-sh4.c
  *
  * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
  * Copyright (C) 2002  Paul Mundt
@@ -101,3 +99,24 @@ void copy_user_page(void *to, void *from, unsigned long address,
                up(&p3map_sem[(address & CACHE_ALIAS)>>12]);
        }
 }
+
+/*
+ * For SH-4, we have our own implementation for ptep_get_and_clear
+ */
+inline pte_t ptep_get_and_clear(pte_t *ptep)
+{
+       pte_t pte = *ptep;
+
+       pte_clear(ptep);
+       if (!pte_not_present(pte)) {
+               unsigned long pfn = pte_pfn(pte);
+               if (pfn_valid(pfn)) {
+                       struct page *page = pfn_to_page(pfn);
+                       struct address_space *mapping = page_mapping(page);
+                       if (!mapping || !mapping_writably_mapped(mapping))
+                               __clear_bit(PG_mapped, &page->flags);
+               }
+       }
+       return pte;
+}
+