radix tree test harness

This code is mostly from Andrew Morton and Nick Piggin; tarball downloaded
from http://ozlabs.org/~akpm/rtth.tar.gz with sha1sum
0ce679db9ec047296b5d1ff7a1dfaa03a7bef1bd

Some small modifications were necessary to the test harness to fix the
build with the current Linux source code.

I also made minor modifications to automatically test the radix-tree.c
and radix-tree.h files that are in the current source tree, as opposed
to a copied and slightly modified version.  I am sure more could be done
to tidy up the harness, as well as adding more tests.

[koct9i@gmail.com: fix compilation]
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

tools/testing/radix-tree/linux/kernel.h

@@ -0,0 +1,34 @@
+#ifndef _KERNEL_H
+#define _KERNEL_H
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <limits.h>
+
+#ifndef NULL
+#define NULL	0
+#endif
+
+#define BUG_ON(expr)	assert(!(expr))
+#define __init
+#define panic(expr)
+#define printk printf
+#define __force
+#define likely(c) (c)
+#define unlikely(c) (c)
+#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+#define container_of(ptr, type, member) ({                      \
+	const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
+	(type *)( (char *)__mptr - offsetof(type, member) );})
+#define min(a, b) ((a) < (b) ? (a) : (b))
+
+static inline int in_interrupt(void)
+{
+	return 0;
+}
+#endif /* _KERNEL_H */