+ maple_tree-use-mas_bug_on-when-setting-a-leaf-node-as-a-parent.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: maple_tree: use MAS_BUG_ON() when setting a leaf node as a parent
has been added to the -mm mm-unstable branch.  Its filename is
     maple_tree-use-mas_bug_on-when-setting-a-leaf-node-as-a-parent.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-use-mas_bug_on-when-setting-a-leaf-node-as-a-parent.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: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Subject: maple_tree: use MAS_BUG_ON() when setting a leaf node as a parent
Date: Fri, 5 May 2023 13:41:38 -0400

Use MAS_BUG_ON() to dump the maple state and tree in the unlikely event of
an issue.

Link: https://lkml.kernel.org/r/20230505174204.2665599-11-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: David Binderman <dcb314@hotmail.com>
Cc: Peng Zhang <zhangpeng.00@bytedance.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/maple_tree.c |   26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

--- a/lib/maple_tree.c~maple_tree-use-mas_bug_on-when-setting-a-leaf-node-as-a-parent
+++ a/lib/maple_tree.c
@@ -453,7 +453,7 @@ enum maple_type mas_parent_type(struct m
 }
 
 /*
- * mte_set_parent() - Set the parent node and encode the slot
+ * mas_set_parent() - Set the parent node and encode the slot
  * @enode: The encoded maple node.
  * @parent: The encoded maple node that is the parent of @enode.
  * @slot: The slot that @enode resides in @parent.
@@ -462,16 +462,16 @@ enum maple_type mas_parent_type(struct m
  * parent type.
  */
 static inline
-void mte_set_parent(struct maple_enode *enode, const struct maple_enode *parent,
-		    unsigned char slot)
+void mas_set_parent(struct ma_state *mas, struct maple_enode *enode,
+		    const struct maple_enode *parent, unsigned char slot)
 {
 	unsigned long val = (unsigned long)parent;
 	unsigned long shift;
 	unsigned long type;
 	enum maple_type p_type = mte_node_type(parent);
 
-	BUG_ON(p_type == maple_dense);
-	BUG_ON(p_type == maple_leaf_64);
+	MAS_BUG_ON(mas, p_type == maple_dense);
+	MAS_BUG_ON(mas, p_type == maple_leaf_64);
 
 	switch (p_type) {
 	case maple_range_64:
@@ -1740,7 +1740,7 @@ static inline void mas_adopt_children(st
 	offset = ma_data_end(node, type, pivots, mas->max);
 	do {
 		child = mas_slot_locked(mas, slots, offset);
-		mte_set_parent(child, parent, offset);
+		mas_set_parent(mas, child, parent, offset);
 	} while (offset--);
 }
 
@@ -2705,9 +2705,9 @@ static inline void mas_set_split_parent(
 		return;
 
 	if ((*slot) <= split)
-		mte_set_parent(mas->node, left, *slot);
+		mas_set_parent(mas, mas->node, left, *slot);
 	else if (right)
-		mte_set_parent(mas->node, right, (*slot) - split - 1);
+		mas_set_parent(mas, mas->node, right, (*slot) - split - 1);
 
 	(*slot)++;
 }
@@ -3104,12 +3104,12 @@ static int mas_spanning_rebalance(struct
 				mte_node_type(mast->orig_l->node));
 	mast->orig_l->depth++;
 	mab_mas_cp(mast->bn, 0, mt_slots[mast->bn->type] - 1, &l_mas, true);
-	mte_set_parent(left, l_mas.node, slot);
+	mas_set_parent(mas, left, l_mas.node, slot);
 	if (middle)
-		mte_set_parent(middle, l_mas.node, ++slot);
+		mas_set_parent(mas, middle, l_mas.node, ++slot);
 
 	if (right)
-		mte_set_parent(right, l_mas.node, ++slot);
+		mas_set_parent(mas, right, l_mas.node, ++slot);
 
 	if (mas_is_root_limits(mast->l)) {
 new_root:
@@ -3336,8 +3336,8 @@ static inline bool mas_split_final_node(
 	 * The Big_node data should just fit in a single node.
 	 */
 	ancestor = mas_new_ma_node(mas, mast->bn);
-	mte_set_parent(mast->l->node, ancestor, mast->l->offset);
-	mte_set_parent(mast->r->node, ancestor, mast->r->offset);
+	mas_set_parent(mas, mast->l->node, ancestor, mast->l->offset);
+	mas_set_parent(mas, mast->r->node, ancestor, mast->r->offset);
 	mte_to_node(ancestor)->parent = mas_mn(mas)->parent;
 
 	mast->l->node = ancestor;
_

Patches currently in -mm which might be from Liam.Howlett@oracle.com are

maple_tree-fix-static-analyser-cppcheck-issue.patch
maple_tree-avoid-unnecessary-ascending.patch
maple_tree-clean-up-mas_dfs_postorder.patch
maple_tree-add-debug-bug_on-and-warn_on-variants.patch
maple_tree-use-mas_bug_on-when-setting-a-leaf-node-as-a-parent.patch
maple_tree-use-mas_bug_on-in-mas_set_height.patch
maple_tree-use-mas_bug_on-from-mas_topiary_range.patch
maple_tree-use-mas_wr_bug_on-in-mas_store_prealloc.patch
maple_tree-use-mas_bug_on-prior-to-calling-mas_meta_gap.patch
maple_tree-return-error-on-mte_pivots-out-of-range.patch
maple_tree-make-test-code-work-without-debug-enabled.patch
mm-update-validate_mm-to-use-vma-iterator.patch
mm-update-vma_iter_store-to-use-mas_warn_on.patch
maple_tree-add-__init-and-__exit-to-test-module.patch
maple_tree-remove-unnecessary-check-from-mas_destroy.patch
maple_tree-mas_start-reset-depth-on-dead-node.patch
mm-mmap-change-do_vmi_align_munmap-for-maple-tree-iterator-changes.patch
maple_tree-try-harder-to-keep-active-node-after-mas_next.patch
maple_tree-try-harder-to-keep-active-node-with-mas_prev.patch
maple_tree-revise-limit-checks-in-mas_empty_area_rev.patch
maple_tree-fix-testing-mas_empty_area.patch
maple_tree-introduce-mas_next_slot-interface.patch
maple_tree-add-mas_next_range-and-mas_find_range-interfaces.patch
maple_tree-relocate-mas_rewalk-and-mas_rewalk_if_dead.patch
maple_tree-introduce-mas_prev_slot-interface.patch
maple_tree-add-mas_prev_range-and-mas_find_range_rev-interface.patch
maple_tree-clear-up-index-and-last-setting-in-single-entry-tree.patch
maple_tree-update-testing-code-for-mas_nextprevwalk.patch
mm-add-vma_iter_nextprev_range-to-vma-iterator.patch
mm-avoid-rewalk-in-mmap_region.patch
maple_tree-add-gap-to-check_alloc_rev_range-testcase.patch