[PATCH] Fix missing pfn variables caused by vm changes

I image this showed up because of "unused var..." when the changes
occured, because flush_cache_page() is a noop in most places.  This
showed up for me on parisc however, where flush_cache_page() is a real
function.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/memory.c

@@ -1345,7 +1345,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
 		int reuse = can_share_swap_page(old_page);
 		unlock_page(old_page);
 		if (reuse) {
-			flush_cache_page(vma, address, pfn);
+			flush_cache_page(vma, address, pte_pfn(orig_pte));
 			entry = pte_mkyoung(orig_pte);
 			entry = maybe_mkwrite(pte_mkdirty(entry), vma);
 			ptep_set_access_flags(vma, address, page_table, entry, 1);
@@ -1389,7 +1389,7 @@ gotten:
 			}
 		} else
 			inc_mm_counter(mm, anon_rss);
-		flush_cache_page(vma, address, pfn);
+		flush_cache_page(vma, address, pte_pfn(orig_pte));
 		entry = mk_pte(new_page, vma->vm_page_prot);
 		entry = maybe_mkwrite(pte_mkdirty(entry), vma);
 		ptep_establish(vma, address, page_table, entry);

mm/rmap.c

@@ -641,7 +641,7 @@ static void try_to_unmap_cluster(unsigned long cursor,
 			continue;
 
 		/* Nuke the page table entry. */
-		flush_cache_page(vma, address, pfn);
+		flush_cache_page(vma, address, pte_pfn(*pte));
 		pteval = ptep_clear_flush(vma, address, pte);
 
 		/* If nonlinear, store the file page offset in the pte. */