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maple_tree: add a test check deficient node
Add a test to assert when resulting a deficient node on splitting. We can achieve this by build a tree with two nodes. With the left node with consecutive data from 0 and leave some room for the final insert to locate in left node. And the right node a full node to force the split happens on the left node. Link: https://lkml.kernel.org/r/20241113031616.10530-3-richard.weiyang@gmail.com Signed-off-by: Wei Yang <richard.weiyang@gmail.com> Reviewed-by: 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>
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aeb6295c17
@ -1563,6 +1563,30 @@ static noinline void __init check_root_expand(struct maple_tree *mt)
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mas_unlock(&mas);
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}
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static noinline void __init check_deficient_node(struct maple_tree *mt)
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{
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MA_STATE(mas, mt, 0, 0);
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int count;
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mas_lock(&mas);
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for (count = 0; count < 10; count++) {
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mas_set(&mas, count);
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mas_store_gfp(&mas, xa_mk_value(count), GFP_KERNEL);
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}
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for (count = 20; count < 39; count++) {
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mas_set(&mas, count);
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mas_store_gfp(&mas, xa_mk_value(count), GFP_KERNEL);
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}
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for (count = 10; count < 12; count++) {
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mas_set(&mas, count);
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mas_store_gfp(&mas, xa_mk_value(count), GFP_KERNEL);
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}
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mas_unlock(&mas);
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mt_validate(mt);
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}
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static noinline void __init check_gap_combining(struct maple_tree *mt)
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{
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struct maple_enode *mn1, *mn2;
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@ -3796,6 +3820,10 @@ static int __init maple_tree_seed(void)
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goto skip;
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#endif
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mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
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check_deficient_node(&tree);
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mtree_destroy(&tree);
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mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
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check_store_null(&tree);
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mtree_destroy(&tree);
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