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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/lib/rbtree_test.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 #include <linux/module.h>
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 #include <linux/moduleparam.h>
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 #include <linux/rbtree_augmented.h>
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@@ -76,26 +77,10 @@
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 }
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-static inline u32 augment_recompute(struct test_node *node)
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-{
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-	u32 max = node->val, child_augmented;
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-	if (node->rb.rb_left) {
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-		child_augmented = rb_entry(node->rb.rb_left, struct test_node,
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-					   rb)->augmented;
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-		if (max < child_augmented)
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-			max = child_augmented;
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-	}
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-	if (node->rb.rb_right) {
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-		child_augmented = rb_entry(node->rb.rb_right, struct test_node,
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-					   rb)->augmented;
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-		if (max < child_augmented)
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-			max = child_augmented;
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-	}
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-	return max;
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-}
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+#define NODE_VAL(node) ((node)->val)
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-RB_DECLARE_CALLBACKS(static, augment_callbacks, struct test_node, rb,
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-		     u32, augmented, augment_recompute)
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+RB_DECLARE_CALLBACKS_MAX(static, augment_callbacks,
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+			 struct test_node, rb, u32, augmented, NODE_VAL)
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 static void insert_augmented(struct test_node *node,
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 			     struct rb_root_cached *root)
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@@ -237,7 +222,20 @@
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 	check(nr_nodes);
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 	for (rb = rb_first(&root.rb_root); rb; rb = rb_next(rb)) {
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 		struct test_node *node = rb_entry(rb, struct test_node, rb);
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-		WARN_ON_ONCE(node->augmented != augment_recompute(node));
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+		u32 subtree, max = node->val;
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+		if (node->rb.rb_left) {
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+			subtree = rb_entry(node->rb.rb_left, struct test_node,
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+					   rb)->augmented;
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+			if (max < subtree)
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+				max = subtree;
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+		}
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+		if (node->rb.rb_right) {
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+			subtree = rb_entry(node->rb.rb_right, struct test_node,
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+					   rb)->augmented;
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+			if (max < subtree)
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+				max = subtree;
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+		}
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+		WARN_ON_ONCE(node->augmented != max);
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 	}
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 }
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