/usr/share/systemtap/runtime/linux/autoconf-hrtimer-rel.c is in systemtap-common 2.9-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #include <linux/hrtimer.h>
int x = HRTIMER_REL; /* as opposed to HRTIMER_MODE_REL */
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