/usr/share/systemtap/runtime/linux/autoconf-inode-uretprobes.c is in systemtap-common 2.3-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #if defined(CONFIG_ARCH_SUPPORTS_UPROBES) && defined(CONFIG_UPROBES)
#include <linux/wait.h>
#include <linux/uprobes.h>
/* Check whether we have uretprobes. */
struct uprobe_consumer uc = { .ret_handler = NULL };
#else
#error "not an inode-uprobes kernel"
#endif
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