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rb_tree: remove redundant if()-condition in rb_erase()

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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>
This commit is contained in:
Wolfram Strepp 2009-06-16 15:34:13 -07:00 • committed by Linus Torvalds
commit 4b324126e0
1 changed files with 4 additions and 4 deletions
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8
lib/rbtree.c
View file

@ -250,15 +250,15 @@ 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;
}