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

On 5/6/21 9:43 AM, Mark Brown wrote:

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

quoted

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.

I will make changes based on the comments I have received so far and send
out version 4 so everything is current for the next round of review.

Thanks!

Madhavan

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