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/usr/share/systemtap/runtime/linux/autoconf-tracepoint-strings.c is in systemtap-common 2.9-2ubuntu2.

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#include <linux/tracepoint.h>

/* Until 3.15 (commit de7b2973903c), tracepoints used strings to register.  */
void foo (void) {
	(void) tracepoint_probe_register("foo", NULL, NULL);
	tracepoint_probe_unregister("foo", NULL, NULL);
}