[NET]: ARM26 checksum annotations and cleanups.

[linux-2.6] / include / asm-i386 / pgtable.h

diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h
index 8cb708a6bed057e764daf33f4eceae5f46bb3b94..7d398f493ddeedfc2d5e826d595028767ae64b76 100644 (file)
--- a/include/asm-i386/pgtable.h
+++ b/include/asm-i386/pgtable.h
@@ -246,6 +246,23 @@ static inline pte_t pte_mkhuge(pte_t pte)  { (pte).pte_low |= _PAGE_PSE; return p
 # include <asm/pgtable-2level.h>
 #endif
 
+/*
+ * Rules for using pte_update - it must be called after any PTE update which
+ * has not been done using the set_pte / clear_pte interfaces.  It is used by
+ * shadow mode hypervisors to resynchronize the shadow page tables.  Kernel PTE
+ * updates should either be sets, clears, or set_pte_atomic for P->P
+ * transitions, which means this hook should only be called for user PTEs.
+ * This hook implies a P->P protection or access change has taken place, which
+ * requires a subsequent TLB flush.  The notification can optionally be delayed
+ * until the TLB flush event by using the pte_update_defer form of the
+ * interface, but care must be taken to assure that the flush happens while
+ * still holding the same page table lock so that the shadow and primary pages
+ * do not become out of sync on SMP.
+ */
+#define pte_update(mm, addr, ptep)             do { } while (0)
+#define pte_update_defer(mm, addr, ptep)       do { } while (0)
+
+
 /*
  * We only update the dirty/accessed state if we set
  * the dirty bit by hand in the kernel, since the hardware
@@ -258,6 +275,7 @@ static inline pte_t pte_mkhuge(pte_t pte)   { (pte).pte_low |= _PAGE_PSE; return p
 do {                                                                   \
        if (dirty) {                                                    \
                (ptep)->pte_low = (entry).pte_low;                      \
+               pte_update_defer((vma)->vm_mm, (addr), (ptep));         \
                flush_tlb_page(vma, address);                           \
        }                                                               \
 } while (0)
@@ -287,6 +305,7 @@ do {                                                                        \
        __dirty = pte_dirty(*(ptep));                                   \
        if (__dirty) {                                                  \
                clear_bit(_PAGE_BIT_DIRTY, &(ptep)->pte_low);           \
+               pte_update_defer((vma)->vm_mm, (addr), (ptep));         \
                flush_tlb_page(vma, address);                           \
        }                                                               \
        __dirty;                                                        \
@@ -299,6 +318,7 @@ do {                                                                        \
        __young = pte_young(*(ptep));                                   \
        if (__young) {                                                  \
                clear_bit(_PAGE_BIT_ACCESSED, &(ptep)->pte_low);        \
+               pte_update_defer((vma)->vm_mm, (addr), (ptep));         \
                flush_tlb_page(vma, address);                           \
        }                                                               \
        __young;                                                        \
@@ -321,6 +341,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long
 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
        clear_bit(_PAGE_BIT_RW, &ptep->pte_low);
+       pte_update(mm, addr, ptep);
 }
 
 /*