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

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Date:   Fri, 7 Apr 2023 23:22:09 -0400
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     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

* Liam R. Howlett <Liam.Howlett@...cle.com> [230407 23:17]:
> * 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.
> 
> Please have a look at check_new_node() as there are tests there already
> and see if it covers what you are trying to test.

Sorry, sent this too fast.  I'll have a look after the holiday here.

> 
> > 
> > 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
> >