[hbirr] 18848: Lock always the address space if we changing the virtual mapping.

Lock always the address space if we changing the virtual mapping. 
This is necessary because we can create or remove a page table.
Modified: trunk/reactos/ntoskrnl/mm/anonmem.c
  _____

Modified: trunk/reactos/ntoskrnl/mm/anonmem.c
--- trunk/reactos/ntoskrnl/mm/anonmem.c	2005-10-29 13:43:09 UTC (rev
18847)
+++ trunk/reactos/ntoskrnl/mm/anonmem.c	2005-10-29 14:09:00 UTC (rev
18848)
@@ -171,6 +171,7 @@

*/
    if (!WasDirty)
    {
+      MmLockAddressSpace(AddressSpace);
       MmDeleteVirtualMapping(AddressSpace->Process, Address, FALSE,
NULL, NULL);
       MmDeleteAllRmaps(Page, NULL, NULL);
       if ((SwapEntry = MmGetSavedSwapEntryPage(Page)) != 0)
@@ -178,6 +179,7 @@
          MmCreatePageFileMapping(AddressSpace->Process, Address,
SwapEntry);
          MmSetSavedSwapEntryPage(Page, 0);
       }
+      MmUnlockAddressSpace(AddressSpace);
       MmReleasePageMemoryConsumer(MC_USER, Page);
       PageOp->Status = STATUS_SUCCESS;
       KeSetEvent(&PageOp->CompletionEvent, IO_NO_INCREMENT, FALSE);
@@ -222,8 +224,10 @@
     * Otherwise we have succeeded, free the page
     */
    DPRINT("MM: Swapped out virtual memory page 0x%.8X!\n", Page <<
PAGE_SHIFT);
+   MmLockAddressSpace(AddressSpace);
    MmDeleteVirtualMapping(AddressSpace->Process, Address, FALSE, NULL,
NULL);
    MmCreatePageFileMapping(AddressSpace->Process, Address, SwapEntry);
+   MmUnlockAddressSpace(AddressSpace);
    MmDeleteAllRmaps(Page, NULL, NULL);
    MmSetSavedSwapEntryPage(Page, 0);
    MmReleasePageMemoryConsumer(MC_USER, Page);
@@ -997,7 +1001,7 @@
    Info->BaseAddress = RegionBase;
    Info->AllocationBase = MemoryArea->StartingAddress;
    Info->AllocationProtect = MemoryArea->Attributes;
-   Info->RegionSize = (char*)RegionBase + Region->Length -
(char*)Info->BaseAddress;
+   Info->RegionSize = Region->Length;
    Info->State = Region->Type;
    Info->Protect = Region->Protect;
    Info->Type = MEM_PRIVATE;