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test_maple_tree: testing the cyclic allocation 

This tests the interactions of the cyclic allocations, the maple state
index and last, and overflow.

Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Link: https://lore.kernel.org/r/170820144894.6328.13052830860966450674.stgit@91.116.238.104.host.secureserver.net
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Liam R. Howlett 2024-02-17 15:24:08 -05:00 committed by Christian Brauner
parent 9b6713cc75
commit f92e1a829d
1 changed files with 44 additions and 0 deletions
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44
lib/test_maple_tree.c
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@ -3599,6 +3599,45 @@ static noinline void __init check_state_handling(struct maple_tree *mt)
mas_unlock(&mas);
}
static noinline void __init alloc_cyclic_testing(struct maple_tree *mt)
{
unsigned long location;
unsigned long next;
int ret = 0;
MA_STATE(mas, mt, 0, 0);
next = 0;
mtree_lock(mt);
for (int i = 0; i < 100; i++) {
mas_alloc_cyclic(&mas, &location, mt, 2, ULONG_MAX, &next, GFP_KERNEL);
MAS_BUG_ON(&mas, i != location - 2);
MAS_BUG_ON(&mas, mas.index != location);
MAS_BUG_ON(&mas, mas.last != location);
MAS_BUG_ON(&mas, i != next - 3);
}
mtree_unlock(mt);
mtree_destroy(mt);
next = 0;
mt_init_flags(mt, MT_FLAGS_ALLOC_RANGE);
for (int i = 0; i < 100; i++) {
mtree_alloc_cyclic(mt, &location, mt, 2, ULONG_MAX, &next, GFP_KERNEL);
MT_BUG_ON(mt, i != location - 2);
MT_BUG_ON(mt, i != next - 3);
MT_BUG_ON(mt, mtree_load(mt, location) != mt);
}
mtree_destroy(mt);
/* Overflow test */
next = ULONG_MAX - 1;
ret = mtree_alloc_cyclic(mt, &location, mt, 2, ULONG_MAX, &next, GFP_KERNEL);
MT_BUG_ON(mt, ret != 0);
ret = mtree_alloc_cyclic(mt, &location, mt, 2, ULONG_MAX, &next, GFP_KERNEL);
MT_BUG_ON(mt, ret != 0);
ret = mtree_alloc_cyclic(mt, &location, mt, 2, ULONG_MAX, &next, GFP_KERNEL);
MT_BUG_ON(mt, ret != 1);
}
static DEFINE_MTREE(tree);
static int __init maple_tree_seed(void)
{
@ -3880,6 +3919,11 @@ static int __init maple_tree_seed(void)
check_state_handling(&tree);
mtree_destroy(&tree);
mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
alloc_cyclic_testing(&tree);
mtree_destroy(&tree);
#if defined(BENCH)
skip:
#endif