* The new vm_page_mappings weren't updated correctly in many cases.

* Added a comment to vm_remove_all_page_mappings() that shows that we need to
  change the mapping spinlock into a mutex.
* Pointed out some potential problems in the code.
* Added vm_page_at_index(), vm_clear_map_activation(), and vm_test_map_activation()
  in preparation of the page scanner rewrite.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20407 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/vm.h

@@ -62,6 +62,8 @@ status_t vm_create_vnode_cache(void *vnode, vm_cache_ref **_cacheRef);
 vm_area *vm_area_lookup(vm_address_space *addressSpace, addr_t address);
 status_t vm_set_area_memory_type(area_id id, addr_t physicalBase, uint32 type);
 status_t vm_get_page_mapping(team_id team, addr_t vaddr, addr_t *paddr);
+int32 vm_test_map_activation(vm_page *page);
+void vm_clear_map_activation(vm_page *page);
 void vm_remove_all_page_mappings(vm_page *page);
 status_t vm_unmap_pages(vm_area *area, addr_t base, size_t length);
 status_t vm_map_page(vm_area *area, vm_page *page, addr_t address,

headers/private/kernel/vm_page.h

@@ -38,7 +38,8 @@ vm_page *vm_page_allocate_page(int state);
 status_t vm_page_allocate_pages(int pageState, vm_page **pages, uint32 numPages);
 vm_page *vm_page_allocate_page_run(int state, addr_t length);
 vm_page *vm_page_allocate_specific_page(addr_t page_num, int state);
-vm_page *vm_lookup_page(addr_t page_num);
+vm_page *vm_page_at_index(int32 index);
+vm_page *vm_lookup_page(addr_t pageNumber);
 
 #ifdef __cplusplus
 }