Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Thu, 8 Apr 2021 17:58:25 +0100
From:   Mark Brown <broonie@kernel.org>
To:     madvenka@linux.microsoft.com, mark.rutland@arm.com
Cc:     jpoimboe@redhat.com, jthierry@redhat.com, catalin.marinas@arm.com,
        will@kernel.org, linux-arm-kernel@lists.infradead.org,
        live-patching@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v2 3/4] arm64: Detect FTRACE cases that make the
 stack trace unreliable
Message-ID: <20210408165825.GP4516@sirena.org.uk>
References: <705993ccb34a611c75cdae0a8cb1b40f9b218ebd>
 <20210405204313.21346-1-madvenka@linux.microsoft.com>
 <20210405204313.21346-4-madvenka@linux.microsoft.com>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha512;
        protocol="application/pgp-signature"; boundary="LfQcPIWFRhGivmDw"
Content-Disposition: inline
In-Reply-To: <20210405204313.21346-4-madvenka@linux.microsoft.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Precedence: bulk


--LfQcPIWFRhGivmDw
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Mon, Apr 05, 2021 at 03:43:12PM -0500, madvenka@linux.microsoft.com wrot=
e:
> From: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>
>=20
> When CONFIG_DYNAMIC_FTRACE_WITH_REGS is enabled and tracing is activated
> for a function, the ftrace infrastructure is called for the function at
> the very beginning. Ftrace creates two frames:

This looks good to me however I'd really like someone who has a firmer
understanding of what ftrace is doing to double check as it is entirely
likely that I am missing cases here, it seems likely that if I am
missing stuff it's extra stuff that needs to be added and we're not
actually making use of the reliability information yet.

--LfQcPIWFRhGivmDw
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----

iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmBvNjEACgkQJNaLcl1U
h9DvhAgAgAJBXnn2mXE3bqxCAxxZ0ON7WKXWJ4AqHOgUJMlSbwacx8qcSZk15YJG
yR02M4hQMPpKRHHSCfNvn1EoC2DHR/HbnibDN0hTe1RkYsPKUv85X+nwHLb1uW49
Yg/tpZ4OSFmMCQYQopW0bffgNK05i0cypnANyGM45qooTdOyMQOUf7Nw7FbUWjSK
aDHHHeWMCs/CZy6as3c1m5PDrgKncByRVcKT6o1eack0p6Ok6zPmSUe9uePVzLoB
NJ+QPh+s0SCltRZ0MG5cC/+NNC0d/Z9CMwzrcSMg+n9VzQIjX3C+cB+6wVxMdAv8
3KA3kaFHl1DWgtYLfdxdE0q/hkrBzg==
=xE1N
-----END PGP SIGNATURE-----

--LfQcPIWFRhGivmDw--