[Bug translator/29028] Linux 5.18.0 kernels changed struct kretprobe_instance member fields and scripts with return probes fail to compile

[wcohen at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29028

--- Comment #1 from William Cohen <wcohen at redhat dot com> ---
Created attachment 14080
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14080&action=edit
Provide a helper function to get ret_addr from the correct struct

The ret_addr field moves between structs based on CONFIG_KRETPROBE_ON_RETHOOK. 
Only observed this on x86_64 rawhide 5.18.0* kernels so far.  The kernel change
just appears to affect the kretprobes and not the uprobes.  This patch allows
the reproducer to work on fedora rawhide.  Now testing it on x86_64 f35 and
other places to verify that it doesn't break things.

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