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

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Date:   Thu, 6 May 2021 15:43:52 +0100
From:   Mark Brown <broonie@...nel.org>
To:     madvenka@...ux.microsoft.com
Cc:     jpoimboe@...hat.com, mark.rutland@....com, jthierry@...hat.com,
        catalin.marinas@....com, will@...nel.org, jmorris@...ei.org,
        pasha.tatashin@...een.com, linux-arm-kernel@...ts.infradead.org,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: 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@...ux.microsoft.com wrote:
> From: "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>
> 
> 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.

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