* Wei Yang <richard.weiyang@xxxxxxxxx> [241018 22:37]:
> Add a test to assert that, when storing null to am empty tree or a
> single entry tree it will not result into:
>
> * a root node with range [0, ULONG_MAX] set to NULL
> * a root node with consecutive slot set to NULL
>
> Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
> CC: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
> CC: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
> CC: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
This patch doesn't apply to the tag you specified or I'm using the wrong
git id. I tried git id e993457df.
>
> ---
> v3: move test into lib/test_maple_tree.c
> ---
> lib/test_maple_tree.c | 90 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 90 insertions(+)
>
> diff --git a/lib/test_maple_tree.c b/lib/test_maple_tree.c
> index 31561e0e1a0d..2ef72f6c6d1b 100644
> --- a/lib/test_maple_tree.c
> +++ b/lib/test_maple_tree.c
> @@ -1387,6 +1387,92 @@ static noinline void __init check_prev_entry(struct maple_tree *mt)
> mas_unlock(&mas);
> }
>
> +static noinline void __init check_store_null(struct maple_tree *mt)
> +{
> + MA_STATE(mas, mt, 0, ULONG_MAX);
> +
> + /*
> + * Store NULL at range [0, ULONG_MAX] to an empty tree should result
> + * in an empty tree
> + */
> + mt_init_flags(mt, MT_FLAGS_ALLOC_RANGE);
> + mas_lock(&mas);
> + mas_store_gfp(&mas, NULL, GFP_KERNEL);
> + MT_BUG_ON(mt, !mtree_empty(mt));
> + mas_unlock(&mas);
> + mtree_destroy(mt);
> +
> + /*
> + * Store NULL at any range to an empty tree should result in an empty
> + * tree
> + */
> + mt_init_flags(mt, MT_FLAGS_ALLOC_RANGE);
> + mas_lock(&mas);
> + mas_set_range(&mas, 3, 10);
> + mas_store_gfp(&mas, NULL, GFP_KERNEL);
> + MT_BUG_ON(mt, !mtree_empty(mt));
> + mas_unlock(&mas);
> + mtree_destroy(mt);
> +
> + /*
> + * Store NULL at range [0, ULONG_MAX] to a single entry tree should
> + * result in an empty tree
> + */
> + mt_init_flags(mt, MT_FLAGS_ALLOC_RANGE);
> + mas_lock(&mas);
> + mas_set(&mas, 0);
> + mas_store_gfp(&mas, &mas, GFP_KERNEL);
> + mas_set_range(&mas, 0, ULONG_MAX);
> + mas_store_gfp(&mas, NULL, GFP_KERNEL);
> + MT_BUG_ON(mt, !mtree_empty(mt));
> + mas_unlock(&mas);
> + mtree_destroy(mt);
> +
> + /*
> + * Store NULL at range [0, n] to a single entry tree should
> + * result in an empty tree
> + */
> + mt_init_flags(mt, MT_FLAGS_ALLOC_RANGE);
> + mas_lock(&mas);
> + mas_set(&mas, 0);
> + mas_store_gfp(&mas, &mas, GFP_KERNEL);
> + mas_set_range(&mas, 0, 5);
> + mas_store_gfp(&mas, NULL, GFP_KERNEL);
> + MT_BUG_ON(mt, !mtree_empty(mt));
> + mas_unlock(&mas);
> + mtree_destroy(mt);
> +
> + /*
> + * Store NULL at range [m, n] where m > 0 to a single entry tree
> + * should still be a single entry tree
> + */
> + mt_init_flags(mt, MT_FLAGS_ALLOC_RANGE);
> + mas_lock(&mas);
> + mas_set(&mas, 0);
> + mas_store_gfp(&mas, &mas, GFP_KERNEL);
> + mas_set_range(&mas, 2, 5);
> + mas_store_gfp(&mas, NULL, GFP_KERNEL);
> + MT_BUG_ON(mt, mtree_empty(mt));
> + MT_BUG_ON(mt, xa_is_node(mt->ma_root));
> + mas_unlock(&mas);
> + mtree_destroy(mt);
> +
> + /*
> + * Store NULL at range [0, ULONG_MAX] to a tree with node should
> + * result in an empty tree
> + */
> + mt_init_flags(mt, MT_FLAGS_ALLOC_RANGE);
> + mas_lock(&mas);
> + mas_set_range(&mas, 1, 3);
> + mas_store_gfp(&mas, &mas, GFP_KERNEL);
> + MT_BUG_ON(mt, !xa_is_node(mt->ma_root));
> + mas_set_range(&mas, 0, ULONG_MAX);
> + mas_store_gfp(&mas, NULL, GFP_KERNEL);
> + MT_BUG_ON(mt, !mtree_empty(mt));
> + mas_unlock(&mas);
> + mtree_destroy(mt);
> +}
> +
> static noinline void __init check_root_expand(struct maple_tree *mt)
> {
> MA_STATE(mas, mt, 0, 0);
> @@ -3710,6 +3796,10 @@ static int __init maple_tree_seed(void)
> goto skip;
> #endif
>
> + mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
> + check_store_null(&tree);
> + mtree_destroy(&tree);
> +
> mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
> check_root_expand(&tree);
> mtree_destroy(&tree);
> --
> 2.34.1
>
