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maple_tree: add a test checking storing null

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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

[akpm@linux-foundation.org: work around build error (mas_root)]
Link: https://lkml.kernel.org/r/20241031231627.14316-6-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wei Yang 2024-10-31 23:16:27 +00:00 committed by Andrew Morton
parent 0ea120b278
commit 431e106019
1 changed files with 90 additions and 0 deletions
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90
lib/test_maple_tree.c
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@ -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(mas_root(&mas)));
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(mas_root(&mas)));
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);