core/rbtree: remove redundant if()-condition in rb_erase()

See kernel commit 4b324126e0c6c3a5080ca3ec0981e8766ed6f1ee

----
Furthermore, notice that the initial checks:

        if (!node->rb_left)
                child = node->rb_right;
        else if (!node->rb_right)
                child = node->rb_left;
        else
        {
                ...
        }
guarantee that old->rb_right is set in the final else branch, therefore
we can omit checking that again.

Signed-off-by: Wolfram Strepp <wstrepp@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
----

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/rbtree.c b/src/rbtree.c
index afbdca64..4e7c0f3a 100644
--- a/src/rbtree.c
+++ b/src/rbtree.c
@@ -248,15 +248,15 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
 			if (child)
 				rb_set_parent(child, parent);
 			parent->rb_left = child;
+
+			node->rb_right = old->rb_right;
+			rb_set_parent(old->rb_right, node);
 		}
 
 		node->rb_parent_color = old->rb_parent_color;
-		node->rb_right = old->rb_right;
 		node->rb_left = old->rb_left;
-
 		rb_set_parent(old->rb_left, node);
-		if (old->rb_right)
-			rb_set_parent(old->rb_right, node);
+
 		goto color;
 	}