patch-2_6_7-vs1_9_1_12

[linux-2.6.git] / include / asm-generic / pgtable.h

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 9bf5071..ee74be6 100644 (file)
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -8,15 +8,32 @@
  *  - update the page tables
  *  - inform the TLB about the new one
  *
- * We hold the mm semaphore for reading and vma->vm_mm->page_table_lock
+ * We hold the mm semaphore for reading and vma->vm_mm->page_table_lock.
+ *
+ * Note: the old pte is known to not be writable, so we don't need to
+ * worry about dirty bits etc getting lost.
  */
 #define ptep_establish(__vma, __address, __ptep, __entry)              \
-do {                                                                   \
+do {                                                                   \
        set_pte(__ptep, __entry);                                       \
        flush_tlb_page(__vma, __address);                               \
 } while (0)
 #endif
 
+#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
+/*
+ * Largely same as above, but only sets the access flags (dirty,
+ * accessed, and writable). Furthermore, we know it always gets set
+ * to a "more permissive" setting, which allows most architectures
+ * to optimize this.
+ */
+#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
+do {                                                                     \
+       set_pte(__ptep, __entry);                                         \
+       flush_tlb_page(__vma, __address);                                 \
+} while (0)
+#endif
+
 #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 static inline int ptep_test_and_clear_young(pte_t *ptep)
 {