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Date:   Thu, 6 May 2021 15:43:52 +0100
From:   Mark Brown <broonie@kernel.org>
To:     madvenka@linux.microsoft.com
Cc:     jpoimboe@redhat.com, mark.rutland@arm.com, jthierry@redhat.com,
        catalin.marinas@arm.com, will@kernel.org, jmorris@namei.org,
        pasha.tatashin@soleen.com, linux-arm-kernel@lists.infradead.org,
        live-patching@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v3 4/4] arm64: Handle funtion graph tracer better in
 the unwinder
Message-ID: <20210506144352.GF4642@sirena.org.uk>
References: <65cf4dfbc439b010b50a0c46ec500432acde86d6>
 <20210503173615.21576-1-madvenka@linux.microsoft.com>
 <20210503173615.21576-5-madvenka@linux.microsoft.com>
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On Mon, May 03, 2021 at 12:36:15PM -0500, madvenka@linux.microsoft.com wrot=
e:
> From: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>
>=20
> 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 cal=
ls
> 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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