Pull sbs into release branch

[pandora-kernel.git] / include / asm-generic / pgtable.h

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 6d7e279..f605e8d 100644 (file)
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -3,37 +3,25 @@
 
 #ifndef __ASSEMBLY__
 
-#ifndef __HAVE_ARCH_PTEP_ESTABLISH
-/*
- * Establish a new mapping:
- *  - flush the old one
- *  - update the page tables
- *  - inform the TLB about the new one
- *
- * We hold the mm semaphore for reading, and the pte 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 {                                                                   \
-       set_pte_at((__vma)->vm_mm, (__address), __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.
+ * to optimize this. We return whether the PTE actually changed, which
+ * in turn instructs the caller to do things like update__mmu_cache.
+ * This used to be done in the caller, but sparc needs minor faults to
+ * force that call on sun4c so we changed this macro slightly
  */
 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
-do {                                                                     \
-       set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry);         \
-       flush_tlb_page(__vma, __address);                                 \
-} while (0)
+({                                                                       \
+       int __changed = !pte_same(*(__ptep), __entry);                    \
+       if (__changed) {                                                  \
+               set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
+               flush_tlb_page(__vma, __address);                         \
+       }                                                                 \
+       __changed;                                                        \
+})
 #endif
 
 #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
@@ -61,31 +49,6 @@ do {                                                                   \
 })
 #endif
 
-#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
-#define ptep_test_and_clear_dirty(__vma, __address, __ptep)            \
-({                                                                     \
-       pte_t __pte = *__ptep;                                          \
-       int r = 1;                                                      \
-       if (!pte_dirty(__pte))                                          \
-               r = 0;                                                  \
-       else                                                            \
-               set_pte_at((__vma)->vm_mm, (__address), (__ptep),       \
-                          pte_mkclean(__pte));                         \
-       r;                                                              \
-})
-#endif
-
-#ifndef __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
-#define ptep_clear_flush_dirty(__vma, __address, __ptep)               \
-({                                                                     \
-       int __dirty;                                                    \
-       __dirty = ptep_test_and_clear_dirty(__vma, __address, __ptep);  \
-       if (__dirty)                                                    \
-               flush_tlb_page(__vma, __address);                       \
-       __dirty;                                                        \
-})
-#endif
-
 #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
 #define ptep_get_and_clear(__mm, __address, __ptep)                    \
 ({                                                                     \
@@ -139,8 +102,15 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
 #define pte_same(A,B)  (pte_val(A) == pte_val(B))
 #endif
 
-#ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
-#define page_test_and_clear_dirty(page) (0)
+#ifndef __HAVE_ARCH_PAGE_TEST_DIRTY
+#define page_test_dirty(page)          (0)
+#endif
+
+#ifndef __HAVE_ARCH_PAGE_CLEAR_DIRTY
+#define page_clear_dirty(page)         do { } while (0)
+#endif
+
+#ifndef __HAVE_ARCH_PAGE_TEST_DIRTY
 #define pte_maybe_dirty(pte)           pte_dirty(pte)
 #else
 #define pte_maybe_dirty(pte)           (1)