linux-kernel - Re: [PATCH 1/2] maple_tree: Add a test case to check maple

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Date:   Mon, 10 Apr 2023 21:02:04 +0800
From:   Peng Zhang <perlyzhang@...il.com>
To:     "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Peng Zhang <zhangpeng.00@...edance.com>,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, maple-tree@...ts.infradead.org
Subject: Re: [PATCH 1/2] maple_tree: Add a test case to check maple_alloc


在 2023/4/10 20:41, Liam R. Howlett 写道:
> * Peng Zhang <zhangpeng.00@...edance.com> [230407 00:09]:
>> Add a test case to check whether the number of maple_alloc structures is
>> actually equal to mas->alloc->total.
> Thanks for the test case.  Can you please send the code to fix the issue
> first in the future?  This way the verification code can be used to
> bisect any issues.
Ok, I will exchange the order of the two patches in the next version.
>
>> Signed-off-by: Peng Zhang <zhangpeng.00@...edance.com>
>> ---
>>   tools/testing/radix-tree/maple.c | 24 ++++++++++++++++++++++++
>>   1 file changed, 24 insertions(+)
>>
>> diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c
>> index 958ee9bdb316..26389e0dcfff 100644
>> --- a/tools/testing/radix-tree/maple.c
>> +++ b/tools/testing/radix-tree/maple.c
>> @@ -55,6 +55,28 @@ struct rcu_reader_struct {
>>   	struct rcu_test_struct2 *test;
>>   };
>>   
>> +static int get_alloc_node_count(struct ma_state *mas)
>> +{
>> +	int count = 1;
>> +	struct maple_alloc *node = mas->alloc;
>> +
>> +	if (!node || ((unsigned long)node & 0x1))
>> +		return 0;
>> +	while (node->node_count) {
>> +		count += node->node_count;
>> +		node = node->slot[0];
>> +	}
>> +	return count;
>> +}
>> +
>> +static void check_mas_alloc_node_count(struct ma_state *mas)
>> +{
>> +	mas_node_count_gfp(mas, MAPLE_ALLOC_SLOTS + 1, GFP_KERNEL);
>> +	mas_node_count_gfp(mas, MAPLE_ALLOC_SLOTS + 3, GFP_KERNEL);
>> +	MT_BUG_ON(mas->tree, get_alloc_node_count(mas) != mas->alloc->total);
>> +	mas_destroy(mas);
>> +}
>> +
>>   /*
>>    * check_new_node() - Check the creation of new nodes and error path
>>    * verification.
>> @@ -69,6 +91,8 @@ static noinline void check_new_node(struct maple_tree *mt)
>>   
>>   	MA_STATE(mas, mt, 0, 0);
>>   
>> +	check_mas_alloc_node_count(&mas);
>> +
>>   	/* Try allocating 3 nodes */
>>   	mtree_lock(mt);
>>   	mt_set_non_kernel(0);
>> -- 
>> 2.20.1
>>