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radix-tree: change naming conventions in radix_tree_shrink

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Use the more standard 'node' and 'child' instead of 'to_free' and
'slot'.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com>
Cc: Jan Kara <jack@suse.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2016-05-20 17:03:33 -07:00 committed by Linus Torvalds
parent b194d16c27
commit af49a63e10
1 changed files with 15 additions and 15 deletions
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30
lib/radix-tree.c
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@ -1395,37 +1395,37 @@ static inline bool radix_tree_shrink(struct radix_tree_root *root)
bool shrunk = false;
for (;;) {
struct radix_tree_node *to_free = root->rnode;
struct radix_tree_node *slot;
struct radix_tree_node *node = root->rnode;
struct radix_tree_node *child;
if (!radix_tree_is_internal_node(to_free))
if (!radix_tree_is_internal_node(node))
break;
to_free = entry_to_node(to_free);
node = entry_to_node(node);
/*
* The candidate node has more than one child, or its child
* is not at the leftmost slot, or the child is a multiorder
* entry, we cannot shrink.
*/
if (to_free->count != 1)
if (node->count != 1)
break;
slot = to_free->slots[0];
if (!slot)
child = node->slots[0];
if (!child)
break;
if (!radix_tree_is_internal_node(slot) && to_free->shift)
if (!radix_tree_is_internal_node(child) && node->shift)
break;
if (radix_tree_is_internal_node(slot))
entry_to_node(slot)->parent = NULL;
if (radix_tree_is_internal_node(child))
entry_to_node(child)->parent = NULL;
/*
* We don't need rcu_assign_pointer(), since we are simply
* moving the node from one part of the tree to another: if it
* was safe to dereference the old pointer to it
* (to_free->slots[0]), it will be safe to dereference the new
* (node->slots[0]), it will be safe to dereference the new
* one (root->rnode) as far as dependent read barriers go.
*/
root->rnode = slot;
root->rnode = child;
/*
* We have a dilemma here. The node's slot[0] must not be
@ -1445,10 +1445,10 @@ static inline bool radix_tree_shrink(struct radix_tree_root *root)
* also results in a stale slot). So tag the slot as indirect
* to force callers to retry.
*/
if (!radix_tree_is_internal_node(slot))
to_free->slots[0] = RADIX_TREE_RETRY;
if (!radix_tree_is_internal_node(child))
node->slots[0] = RADIX_TREE_RETRY;
radix_tree_node_free(to_free);
radix_tree_node_free(node);
shrunk = true;
}