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diff --git a/sys/compat/opensolaris/sys/sdt.h b/sys/compat/opensolaris/sys/sdt.h
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+/*-
+ * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _OPENSOLARIS_SYS_SDT_H_
+#define _OPENSOLARIS_SYS_SDT_H_
+
+#include_next <sys/sdt.h>
+
+#undef DTRACE_PROBE
+#undef DTRACE_PROBE1
+#undef DTRACE_PROBE2
+#undef DTRACE_PROBE3
+#undef DTRACE_PROBE4
+
+#define DTRACE_PROBE(name)
+#define DTRACE_PROBE1(name, type1, arg1)
+#define DTRACE_PROBE2(name, type1, arg1, type2, arg2)
+#define DTRACE_PROBE3(name, type1, arg1, type2, arg2, type3, arg3)
+#define DTRACE_PROBE4(name, type1, arg1, type2, arg2, type3, arg3, type4, arg4)
+
+#endif /* _OPENSOLARIS_SYS_SDT_H_ */
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