[PATCH] populate nonlinear mappings unconditionally

filemap_populate and shmem_populate must install even a linear file_pte,
in case there was a nonlinear page or file_pte already installed there:
could only happen if already VM_NONLINEAR, but no need to check that.

Acked by Ingo and Hugh.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/filemap.c

@@ -1421,15 +1421,9 @@ static int filemap_populate(struct vm_area_struct *vma,
 			return err;
 		}
 	} else {
-	    	/*
-		 * If a nonlinear mapping then store the file page offset
-		 * in the pte.
-		 */
-		if (pgoff != linear_page_index(vma, addr)) {
-	    		err = install_file_pte(mm, vma, addr, pgoff, prot);
-			if (err)
-		    		return err;
-		}
+		err = install_file_pte(mm, vma, addr, pgoff, prot);
+		if (err)
+			return err;
 	}
 
 	len -= PAGE_SIZE;

mm/shmem.c

@@ -1121,15 +1121,9 @@ static int shmem_populate(struct vm_area_struct *vma,
 				return err;
 			}
 		} else if (nonblock) {
-	    		/*
-		 	 * If a nonlinear mapping then store the file page
-			 * offset in the pte.
-			 */
-			if (pgoff != linear_page_index(vma, addr)) {
-	    			err = install_file_pte(mm, vma, addr, pgoff, prot);
-				if (err)
-		    			return err;
-			}
+    			err = install_file_pte(mm, vma, addr, pgoff, prot);
+			if (err)
+	    			return err;
 		}
 
 		len -= PAGE_SIZE;