vmalloc: clean up page array indexing

The page array is repeatedly indexed both in vunmap and vmalloc_area_node().
Add a temporary variable to make it easier to read (and easier to patch
later).
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/vmalloc.c

@@ -384,8 +384,10 @@ static void __vunmap(const void *addr, int deallocate_pages)
 		int i;
 
 		for (i = 0; i < area->nr_pages; i++) {
-			BUG_ON(!area->pages[i]);
-			__free_page(area->pages[i]);
+			struct page *page = area->pages[i];
+
+			BUG_ON(!page);
+			__free_page(page);
 		}
 
 		if (area->flags & VM_VPAGES)
@@ -489,15 +491,19 @@ void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 	}
 
 	for (i = 0; i < area->nr_pages; i++) {
+		struct page *page;
+
 		if (node < 0)
-			area->pages[i] = alloc_page(gfp_mask);
+			page = alloc_page(gfp_mask);
 		else
-			area->pages[i] = alloc_pages_node(node, gfp_mask, 0);
-		if (unlikely(!area->pages[i])) {
+			page = alloc_pages_node(node, gfp_mask, 0);
+
+		if (unlikely(!page)) {
 			/* Successfully allocated i pages, free them in __vunmap() */
 			area->nr_pages = i;
 			goto fail;
 		}
+		area->pages[i] = page;
 	}
 
 	if (map_vm_area(area, prot, &pages))