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Diffstat (limited to 'tools/testing/radix-tree/maple.c')
| -rw-r--r-- | tools/testing/radix-tree/maple.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c index e37a3ab2e921..2c0b38301253 100644 --- a/tools/testing/radix-tree/maple.c +++ b/tools/testing/radix-tree/maple.c @@ -36326,6 +36326,30 @@ static inline void check_spanning_store_height(struct maple_tree *mt) mas_unlock(&mas); } +/* + * Test to check the path of a spanning rebalance which results in + * a collapse where the rebalancing of the child node leads to + * insufficieny in the parent node. + */ +static void check_collapsing_rebalance(struct maple_tree *mt) +{ + int i = 0; + MA_STATE(mas, mt, ULONG_MAX, ULONG_MAX); + + /* create a height 6 tree */ + while (mt_height(mt) < 6) { + mtree_store_range(mt, i, i + 10, xa_mk_value(i), GFP_KERNEL); + i += 9; + } + + /* delete all entries one at a time, starting from the right */ + do { + mas_erase(&mas); + } while (mas_prev(&mas, 0) != NULL); + + mtree_unlock(mt); +} + /* callback function used for check_nomem_writer_race() */ static void writer2(void *maple_tree) { @@ -36497,6 +36521,10 @@ void farmer_tests(void) mtree_destroy(&tree); mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE); + check_collapsing_rebalance(&tree); + mtree_destroy(&tree); + + mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE); check_null_expand(&tree); mtree_destroy(&tree); |