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authorMatthew Wilcox <willy@infradead.org>2017-11-10 23:15:08 +0300
committerMatthew Wilcox <willy@infradead.org>2018-10-21 17:45:57 +0300
commit58d6ea3085f2e53714810a513c61629f6d2be0a6 (patch)
treeb4b73ea07cd720063fd3a2f8b063422c5a0e698a /lib/radix-tree.c
parent9b89a0355144685a787b0dc5bcf7bdd6f2d02968 (diff)
downloadlinux-58d6ea3085f2e53714810a513c61629f6d2be0a6.tar.xz
xarray: Add XArray unconditional store operations
xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'lib/radix-tree.c')
-rw-r--r--lib/radix-tree.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index b8e961428484..3479d93c32b9 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -47,7 +47,7 @@ static unsigned long height_to_maxnodes[RADIX_TREE_MAX_PATH + 1] __read_mostly;
/*
* Radix tree node cache.
*/
-static struct kmem_cache *radix_tree_node_cachep;
+struct kmem_cache *radix_tree_node_cachep;
/*
* The radix tree is variable-height, so an insert operation not only has
@@ -365,7 +365,7 @@ out:
return ret;
}
-static void radix_tree_node_rcu_free(struct rcu_head *head)
+void radix_tree_node_rcu_free(struct rcu_head *head)
{
struct radix_tree_node *node =
container_of(head, struct radix_tree_node, rcu_head);