* Removed unused vm_page::busy_{reading|writing} fields.

* Fixed vm_page_allocate_page_run(): it did not take the pageState into account,
  and would therefore return uninitialized memory (ie. B_CONTIGUOUS areas would
  contain garbage).
  Now, it stores if a page is cleared in a new vm_page::is_cleared field.
* Some cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22306 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/vm_page.h

@@ -37,7 +37,6 @@ status_t vm_page_write_modified(vm_cache *cache, bool fsReenter);
 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_page_at_index(int32 index);
 vm_page *vm_lookup_page(addr_t pageNumber);
 

headers/private/kernel/vm_types.h

@@ -105,8 +105,9 @@ typedef struct vm_page {
 
 	uint8				type : 2;
 	uint8				state : 3;
-	uint8				busy_reading : 1;
-	uint8				busy_writing : 1;
+
+	uint8				is_cleared : 1;
+		// is currently only used in vm_page_allocate_page_run()
 
 	uint16				wired_count;
 	int8				usage_count;