Re: [RFC PATCH v3 4/4] arm64: Handle funtion graph tracer better in the unwinder

On Mon, May 03, 2021 at 12:36:15PM -0500, madvenka@linux.microsoft.com wrote:

From: "Madhavan T. Venkataraman" <redacted>

The Function Graph Tracer modifies the return address of a traced function
to a return trampoline (return_to_handler()) to gather tracing data on
function return. When the unwinder encounters return_to_handler(), it calls
ftrace_graph_get_ret_stack() to lookup the original return address in the
return address stack.

This makes sense to me, I'll need to re-review properly with the changes
earlier on in the series but should be fine.