add bit-radix.h to the repo

diff --git a/bit-radix.h b/bit-radix.h
new file mode 100644 (file)
index 0000000..153d0bf
--- /dev/null
+++ b/bit-radix.h
@@ -0,0 +1,15 @@
+#ifndef __BIT_RADIX__
+#define __BIT_RADIX__
+#include "radix-tree.h"
+
+int set_radix_bit(struct radix_tree_root *radix, unsigned long bit);
+int test_radix_bit(struct radix_tree_root *radix, unsigned long bit);
+int clear_radix_bit(struct radix_tree_root *radix, unsigned long bit);
+int find_first_radix_bit(struct radix_tree_root *radix, unsigned long *retbits,
+                        unsigned long start, int nr);
+
+static inline void init_bit_radix(struct radix_tree_root *radix)
+{
+       INIT_RADIX_TREE(radix, GFP_NOFS);
+}
+#endif