radix-tree: remove restriction on multi-order entries

Now that sibling pointers are handled explicitly, there is no purpose
served by restricting the order to be >= RADIX_TREE_MAP_SHIFT.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Reviewed-by: Ross Zwisler <ross.zwisler@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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index b3364b9..6900f7b 100644 (file)
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -483,8 +483,6 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
        unsigned int height, shift, offset;
        int error;
 
-       BUG_ON((0 < order) && (order < RADIX_TREE_MAP_SHIFT));
-
        /* Make sure the tree is high enough.  */
        if (index > radix_tree_maxindex(root->height)) {
                error = radix_tree_extend(root, index, order);