rbtree: break out of rb_insert_color loop after tree rotation

It is a well known property of rbtrees that insertion never requires more
than two tree rotations.  In our implementation, after one loop iteration
identified one or two necessary tree rotations, we would iterate and look
for more.  However at that point the node's parent would always be black,
which would cause us to exit the loop.

We can make the code flow more obvious by just adding a break statement
after the tree rotations, where we know we are done.  Additionally, in the
cases where two tree rotations are necessary, we don't have to update the
'node' pointer as it wouldn't be used until the next loop iteration, which
we now avoid due to this break statement.

Signed-off-by: Michel Lespinasse <walken@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Daniel Santos <daniel.santos@pobox.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/lib/rbtree.c b/lib/rbtree.c
index ccada9abe6f53b75da664d0718fefc6ea80b6ea8..12abb8abf442244be5b459253259fe6e8ee6135f 100644 (file)
--- a/lib/rbtree.c
+++ b/lib/rbtree.c
@@ -109,18 +109,15 @@ void rb_insert_color(struct rb_node *node, struct rb_root *root)
                                }
                        }
 
-                       if (parent->rb_right == node)
-                       {
-                               register struct rb_node *tmp;
+                       if (parent->rb_right == node) {
                                __rb_rotate_left(parent, root);
-                               tmp = parent;
                                parent = node;
-                               node = tmp;
                        }
 
                        rb_set_black(parent);
                        rb_set_red(gparent);
                        __rb_rotate_right(gparent, root);
+                       break;
                } else {
                        {
                                register struct rb_node *uncle = gparent->rb_left;
@@ -134,18 +131,15 @@ void rb_insert_color(struct rb_node *node, struct rb_root *root)
                                }
                        }
 
-                       if (parent->rb_left == node)
-                       {
-                               register struct rb_node *tmp;
+                       if (parent->rb_left == node) {
                                __rb_rotate_right(parent, root);
-                               tmp = parent;
                                parent = node;
-                               node = tmp;
                        }
 
                        rb_set_black(parent);
                        rb_set_red(gparent);
                        __rb_rotate_left(gparent, root);
+                       break;
                }
        }