On Wed, May 26, 2021 at 04:49:17PM -0500, madvenka@linux.microsoft.com wrote:

+ *	- return_to_handler() is handled by the unwinder by attempting to
+ *	  retrieve the original return address from the per-task return
+ *	  address stack.
+ *
+ *	- kretprobe_trampoline() can be handled in a similar fashion by
+ *	  attempting to retrieve the original return address from the per-task
+ *	  kretprobe instance list.
+ *
+ *	- I reckon optprobes can be handled in a similar fashion in the future?

Note that there's a patch for optprobes on the list now:

   https://lore.kernel.org/r/1622803839-27354-1-git-send-email-liuqi115@huawei.com (local)