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This is to test the walking back up the tree at the end of nodes and error condition. Test inspired by the reproducer code provided by Snild Dolkow. Cc: Snild Dolkow Link: https://lore.kernel.org/linux-mm/cb8dc31a-fef2-1d09-f133-e9f7b9f9e77a@sony.com/ Cc: Fixes: e15e06a83923 ("lib/test_maple_tree: add testing for maple tree") Signed-off-by: Liam R. Howlett --- lib/test_maple_tree.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/lib/test_maple_tree.c b/lib/test_maple_tree.c index 3d19b1f78d71..fa86874763f0 100644 --- a/lib/test_maple_tree.c +++ b/lib/test_maple_tree.c @@ -2670,6 +2670,36 @@ static noinline void check_empty_area_window(struct maple_tree *mt) rcu_read_unlock(); } +static noinline void check_empty_area_fill(struct maple_tree *mt) +{ + int loop, shift; + unsigned long max = 0x25D78000; + unsigned long size; + MA_STATE(mas, mt, 0, 0); + + mt_set_non_kernel(99999); + for (shift = 12; shift <= 16; shift++) { + loop = 5000; + size = 1 << shift; + while (loop--) { + mas_lock(&mas); + MT_BUG_ON(mt, mas_empty_area(&mas, 0, max, size) != 0); + MT_BUG_ON(mt, mas.last != mas.index + size - 1); + mas_store_gfp(&mas, &check_empty_area_fill, GFP_KERNEL); + mas_unlock(&mas); + mas_reset(&mas); + } + } + + /* No space left. */ + size = 0x1000; + rcu_read_lock(); + MT_BUG_ON(mt, mas_empty_area(&mas, 0, max, size) != -EBUSY); + rcu_read_unlock(); + + mt_set_non_kernel(0); +} + static DEFINE_MTREE(tree); static int maple_tree_seed(void) { @@ -2926,6 +2956,11 @@ static int maple_tree_seed(void) check_empty_area_window(&tree); mtree_destroy(&tree); + mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE); + check_empty_area_fill(&tree); + mtree_destroy(&tree); + + #if defined(BENCH) skip: #endif -- 2.39.2