vserver 2.0 rc7

[linux-2.6.git] / Documentation / cachetlb.txt

diff --git a/Documentation/cachetlb.txt b/Documentation/cachetlb.txt
index 9e2f988..e132fb1 100644 (file)
--- a/Documentation/cachetlb.txt
+++ b/Documentation/cachetlb.txt
@@ -142,6 +142,11 @@ changes occur:
        The ia64 sn2 platform is one example of a platform
        that uses this interface.
 
+8) void lazy_mmu_prot_update(pte_t pte)
+       This interface is called whenever the protection on
+       any user PTEs change.  This interface provides a notification
+       to architecture specific code to take appropiate action.
+
 
 Next, we have the cache flushing interfaces.  In general, when Linux
 is changing an existing virtual-->physical mapping to a new value,
@@ -155,7 +160,7 @@ the sequence will be in one of the following forms:
           change_range_of_page_tables(mm, start, end);
           flush_tlb_range(vma, start, end);
 
-       3) flush_cache_page(vma, addr);
+       3) flush_cache_page(vma, addr, pfn);
           set_pte(pte_pointer, new_pte_val);
           flush_tlb_page(vma, addr);
 
@@ -203,7 +208,7 @@ Here are the routines, one by one:
        call flush_cache_page (see below) for each entry which may be
        modified.
 
-3) void flush_cache_page(struct vm_area_struct *vma, unsigned long addr)
+3) void flush_cache_page(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn)
 
        This time we need to remove a PAGE_SIZE sized range
        from the cache.  The 'vma' is the backing structure used by
@@ -213,8 +218,14 @@ Here are the routines, one by one:
        executable (and thus could be in the 'instruction cache' in
        "Harvard" type cache layouts).
 
+       The 'pfn' indicates the physical page frame (shift this value
+       left by PAGE_SHIFT to get the physical address) that 'addr'
+       translates to.  It is this mapping which should be removed from
+       the cache.
+
        After running, there will be no entries in the cache for
-       'vma->vm_mm' for virtual address 'addr'.
+       'vma->vm_mm' for virtual address 'addr' which translates
+       to 'pfn'.
 
        This is used primarily during fault processing.