Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Wed, 2 Aug 2023 10:50:25 +0100
From:   Conor Dooley <conor.dooley@microchip.com>
To:     Greg KH <gregkh@linuxfoundation.org>
CC:     Minda Chen <minda.chen@starfivetech.com>,
        Conor Dooley <conor@kernel.org>,
        Jisheng Zhang <jszhang@kernel.org>,
        Samuel Holland <samuel@sholland.org>,
        Dao Lu <daolu@rivosinc.com>, Heiko Stuebner <heiko@sntech.de>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        <linux-kernel@vger.kernel.org>, <linux-riscv@lists.infradead.org>,
        Mason Huo <mason.huo@starfivetech.com>,
        <stable@vger.kernel.org>
Subject: Re: [PATCH v1] riscv: Using TOOLCHAIN_HAS_ZIHINTPAUSE marco replace
 zihintpause
Message-ID: <20230802-tightwad-squeezing-bcdded12330d@wendy>
References: <20230802064215.31111-1-minda.chen@starfivetech.com>
 <20230802-sharpness-spoon-f9b8804fb66f@wendy>
 <d64874cb-8628-a6d2-d2f4-8af4d0ebf8b2@starfivetech.com>
 <20230802-seismic-gallstone-fca0f4b17076@wendy>
 <c42bd997-8795-8bf7-eee1-3ac8b153371a@starfivetech.com>
 <2023080253-headache-moneybags-a833@gregkh>
 <20230802-decibel-unshaved-fde1cfba2d20@wendy>
 <2023080255-stomp-smell-43ae@gregkh>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha256;
        protocol="application/pgp-signature"; boundary="7mmglFYMmxEffWC0"
Content-Disposition: inline
In-Reply-To: <2023080255-stomp-smell-43ae@gregkh>
Precedence: bulk

--7mmglFYMmxEffWC0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Wed, Aug 02, 2023 at 11:42:59AM +0200, Greg KH wrote:
> On Wed, Aug 02, 2023 at 09:52:45AM +0100, Conor Dooley wrote:
> > On Wed, Aug 02, 2023 at 10:33:27AM +0200, Greg KH wrote:
> > > On Wed, Aug 02, 2023 at 04:17:51PM +0800, Minda Chen wrote:
> > > > On 2023/8/2 15:48, Conor Dooley wrote:
> > > > > On Wed, Aug 02, 2023 at 03:32:15PM +0800, Minda Chen wrote:
> > > > >> On 2023/8/2 14:54, Conor Dooley wrote:

> > > > >> Thanks, Conor. I found this just by inspection. I found a issue =
that vdso.so call cpu_relax
> > > > >> cause application core dump in kernel 6.1.31. I need Samuel'patc=
h to fix this. And I search the log
> > > > >> of processor.h found this issue.
> > > > >=20
> > > > > That doesn't look like it is fixed in later stable kernels (we ar=
e at
> > > > > 6.1.42-rcN right now I think). It sounds we should ask Greg to ba=
ckport
> > > > > 0b1d60d6dd9e ("riscv: Fix build with CONFIG_CC_OPTIMIZE_FOR_SIZE=
=3Dy")
> > > > > to 6.1. Does that make sense to you?
> > > > Yes. 6.1 is lts kernel. Starfive will use this kernel for a long ti=
me. Thanks.
> > >=20
> > > What is preventing you from moving to a newer kernel version?  All of
> > > your kernel changes are already properly merged into Linus's tree,
> > > right?
> >=20
> > Regardless of their reasons, "vdso.so call cpu_relax cause application
> > core dump" is something that we should fix in stable kernels, no?
>=20
> Yes.

It doesn't apply cleanly as a cherry-pick onto linux-6.1, so it'll need
to be submitted. Maybe Minda can do that, since they've got an already
tested version of the patch. Failing that, I will.

--7mmglFYMmxEffWC0
Content-Type: application/pgp-signature; name="signature.asc"

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

iHUEABYIAB0WIQRh246EGq/8RLhDjO14tDGHoIJi0gUCZMom4QAKCRB4tDGHoIJi
0ic9AP9ecnH7XK0svOPmGN8QdpCH7CToY7UNWnokQhm/lLP35AD5ASAuSUm4fkdF
mj9dosTVhTn+FzFakG4X8lLMnfEMwwM=
=5zWd
-----END PGP SIGNATURE-----

--7mmglFYMmxEffWC0--