1 files changed, 14 insertions, 0 deletions

diff --git a/tools/testing/radix-tree/linux/bitops/fls64.h b/tools/testing/radix-tree/linux/bitops/fls64.h
new file mode 100644
index 000000000000..1b6b17ce2428
--- /dev/null
+++ b/tools/testing/radix-tree/linux/bitops/fls64.h
@@ -0,0 +1,14 @@
+#ifndef _ASM_GENERIC_BITOPS_FLS64_H_
+#define _ASM_GENERIC_BITOPS_FLS64_H_
+
+#include <asm/types.h>
+
+static inline int fls64(__u64 x)
+{
+        __u32 h = x >> 32;
+        if (h)
+                return fls(h) + 32;
+        return fls(x);
+}
+
+#endif /* _ASM_GENERIC_BITOPS_FLS64_H_ */