The patch titled
Subject: maple_tree: add a test check deficient node
has been added to the -mm mm-unstable branch. Its filename is
maple_tree-add-a-test-check-deficient-node.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-add-a-test-check-deficient-node.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: maple_tree: add a test check deficient node
Date: Wed, 13 Nov 2024 03:16:15 +0000
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@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Cc: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/test_maple_tree.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
--- a/lib/test_maple_tree.c~maple_tree-add-a-test-check-deficient-node
+++ a/lib/test_maple_tree.c
@@ -1563,6 +1563,30 @@ static noinline void __init check_root_e
mas_unlock(&mas);
}
+static noinline void __init check_deficient_node(struct maple_tree *mt)
+{
+ MA_STATE(mas, mt, 0, 0);
+ int count;
+
+ mas_lock(&mas);
+ for (count = 0; count < 10; count++) {
+ mas_set(&mas, count);
+ mas_store_gfp(&mas, xa_mk_value(count), GFP_KERNEL);
+ }
+
+ for (count = 20; count < 39; count++) {
+ mas_set(&mas, count);
+ mas_store_gfp(&mas, xa_mk_value(count), GFP_KERNEL);
+ }
+
+ for (count = 10; count < 12; count++) {
+ mas_set(&mas, count);
+ mas_store_gfp(&mas, xa_mk_value(count), GFP_KERNEL);
+ }
+ mas_unlock(&mas);
+ mt_validate(mt);
+}
+
static noinline void __init check_gap_combining(struct maple_tree *mt)
{
struct maple_enode *mn1, *mn2;
@@ -3797,6 +3821,10 @@ static int __init maple_tree_seed(void)
#endif
mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
+ check_deficient_node(&tree);
+ mtree_destroy(&tree);
+
+ mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
check_store_null(&tree);
mtree_destroy(&tree);
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
maple_tree-use-mas_next_slot-directly.patch
maple_tree-index-has-been-checked-to-be-smaller-than-pivot.patch
maple_tree-not-possible-to-be-a-root-node-after-loop.patch
maple_tree-we-dont-set-offset-to-maple_node_slots-on-error.patch
maple_tree-simplify-split-calculation.patch
maple_tree-add-a-test-check-deficient-node.patch
maple_tree-only-root-node-could-be-deficient.patch
