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radix-tree: Store a pointer to the root in each node

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Instead of having this mysterious private_data in each radix_tree_node,
store a pointer to the root, which can be useful for debugging.  This also
relieves the mm code from the duty of updating it.

Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
This commit is contained in:
Matthew Wilcox
2017-01-16 17:10:21 -05:00
parent 1293d5c5f5
commit d58275bc96
3 changed files with 11 additions and 11 deletions
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include/linux/radix-tree.h
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@@ -96,7 +96,7 @@ struct radix_tree_node {
unsigned char count; /* Total entry count */
unsigned char exceptional; /* Exceptional entry count */
struct radix_tree_node *parent; /* Used when ascending tree */
void *private_data; /* For tree user */
struct radix_tree_root *root; /* The tree we belong to */
union {
struct list_head private_list; /* For tree user */
struct rcu_head rcu_head; /* Used when freeing node */