diff options
| author | Matthew Wilcox <mawilcox@microsoft.com> | 2017-01-16 23:10:21 +0100 |
|---|---|---|
| committer | Matthew Wilcox <mawilcox@microsoft.com> | 2017-02-14 03:44:05 +0100 |
| commit | d58275bc96ae933b1b3888af80920dd6b020c505 (patch) | |
| tree | e1acf252dc43eeb1d65e4f715b0a1d52b1b4af09 /lib/radix-tree.c | |
| parent | radix-tree: Chain preallocated nodes through ->parent (diff) | |
| download | linux-d58275bc96ae933b1b3888af80920dd6b020c505.tar.xz linux-d58275bc96ae933b1b3888af80920dd6b020c505.zip | |
radix-tree: Store a pointer to the root in each node
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>
Diffstat (limited to 'lib/radix-tree.c')
| -rw-r--r-- | lib/radix-tree.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c index 66c71312c381..dcb9a2329e65 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -374,6 +374,7 @@ static void ida_dump(struct ida *ida) */ static struct radix_tree_node * radix_tree_node_alloc(gfp_t gfp_mask, struct radix_tree_node *parent, + struct radix_tree_root *root, unsigned int shift, unsigned int offset, unsigned int count, unsigned int exceptional) { @@ -419,11 +420,12 @@ radix_tree_node_alloc(gfp_t gfp_mask, struct radix_tree_node *parent, out: BUG_ON(radix_tree_is_internal_node(ret)); if (ret) { - ret->parent = parent; ret->shift = shift; ret->offset = offset; ret->count = count; ret->exceptional = exceptional; + ret->parent = parent; + ret->root = root; } return ret; } @@ -631,7 +633,7 @@ static int radix_tree_extend(struct radix_tree_root *root, gfp_t gfp, do { struct radix_tree_node *node = radix_tree_node_alloc(gfp, NULL, - shift, 0, 1, 0); + root, shift, 0, 1, 0); if (!node) return -ENOMEM; @@ -828,7 +830,7 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index, shift -= RADIX_TREE_MAP_SHIFT; if (child == NULL) { /* Have to add a child node. */ - child = radix_tree_node_alloc(gfp, node, shift, + child = radix_tree_node_alloc(gfp, node, root, shift, offset, 0, 0); if (!child) return -ENOMEM; @@ -1330,7 +1332,7 @@ int radix_tree_split(struct radix_tree_root *root, unsigned long index, for (;;) { if (node->shift > order) { - child = radix_tree_node_alloc(gfp, node, + child = radix_tree_node_alloc(gfp, node, root, node->shift - RADIX_TREE_MAP_SHIFT, offset, 0, 0); if (!child) @@ -2152,8 +2154,8 @@ void **idr_get_free(struct radix_tree_root *root, shift -= RADIX_TREE_MAP_SHIFT; if (child == NULL) { /* Have to add a child node. */ - child = radix_tree_node_alloc(gfp, node, shift, offset, - 0, 0); + child = radix_tree_node_alloc(gfp, node, root, shift, + offset, 0, 0); if (!child) return ERR_PTR(-ENOMEM); all_tag_set(child, IDR_FREE); |