答复: [PATCH] rbtree: stop iteration early in rb_find_first

[Li,Rongqing]

>> 
>>  
>>                          10
>>                        /
>>                       5
>>                        \
>>                         10
>>  
>> The search would stop after visiting node 5, and miss the leaf which
>> is the expected node to be returned.

 thanks for explanation.

> Just to clarify; the current code *does* work here. The proposed patch
> breaks it.

true, my patch is wrong.

but rb_find_first seems have other issue.  when the key is equal, we should search right leaf, not left leaf
rb_find_first should like below

	while (node) {
		int c = cmp(key, node);

		if (c < 0) {
			node = node->rb_left;
		} else {
			if (!c)
				match = node;
			node = node->rb_right;
		}
	}
 
since the node  is inserted to right when the key is equal, see rb_add()

 -Li