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From:   Ricardo Ribalda <ribalda@chromium.org>
Date:   Mon, 1 May 2023 19:18:12 +0200
Message-ID: <CANiDSCtDfPffUQTuH3JiPWC+87FBtpog7kT954PSoiTbB_fmJQ@mail.gmail.com>
Subject: Re: [PATCH v6 4/4] risc/purgatory: Add linker script
To:     Nick Desaulniers <ndesaulniers@google.com>
Cc:     Eric Biederman <ebiederm@xmission.com>,
        Philipp Rudo <prudo@linux.vnet.ibm.com>,
        Dave Young <dyoung@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Tom Rix <trix@redhat.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Nicholas Piggin <npiggin@gmail.com>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>, Baoquan He <bhe@redhat.com>,
        Philipp Rudo <prudo@redhat.com>, kexec@lists.infradead.org,
        linux-kernel@vger.kernel.org, Ross Zwisler <zwisler@google.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Simon Horman <horms@kernel.org>, llvm@lists.linux.dev,
        linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org,
        stable@vger.kernel.org
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Hi Nick

Thanks for catching this. It should have said

risc/purgatory: Remove profile optimization flags

Will fix it on my local branch in case there is a next version of the
series. Otherwise, please the maintainer fix the subject.

Thanks!

On Mon, 1 May 2023 at 18:19, Nick Desaulniers <ndesaulniers@google.com> wro=
te:
>
> On Mon, May 1, 2023 at 5:39=E2=80=AFAM Ricardo Ribalda <ribalda@chromium.=
org> wrote:
> >
> > If PGO is enabled, the purgatory ends up with multiple .text sections.
> > This is not supported by kexec and crashes the system.
> >
> > Cc: stable@vger.kernel.org
> > Fixes: 930457057abe ("kernel/kexec_file.c: split up __kexec_load_purago=
ry")
> > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
>
> Hi Ricardo,
> Thanks for the series.  Does this patch 4/4 need a new online commit
> description? It's not adding a linker script (maybe an earlier version
> was).
>
> > ---
> >  arch/riscv/purgatory/Makefile | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/arch/riscv/purgatory/Makefile b/arch/riscv/purgatory/Makef=
ile
> > index 5730797a6b40..cf3a44121a90 100644
> > --- a/arch/riscv/purgatory/Makefile
> > +++ b/arch/riscv/purgatory/Makefile
> > @@ -35,6 +35,11 @@ CFLAGS_sha256.o :=3D -D__DISABLE_EXPORTS
> >  CFLAGS_string.o :=3D -D__DISABLE_EXPORTS
> >  CFLAGS_ctype.o :=3D -D__DISABLE_EXPORTS
> >
> > +# When profile optimization is enabled, llvm emits two different overl=
apping
> > +# text sections, which is not supported by kexec. Remove profile optim=
ization
> > +# flags.
> > +KBUILD_CFLAGS :=3D $(filter-out -fprofile-sample-use=3D% -fprofile-use=
=3D%,$(KBUILD_CFLAGS))
> > +
> >  # When linking purgatory.ro with -r unresolved symbols are not checked=
,
> >  # also link a purgatory.chk binary without -r to check for unresolved =
symbols.
> >  PURGATORY_LDFLAGS :=3D -e purgatory_start -z nodefaultlib
> >
> > --
> > 2.40.1.495.gc816e09b53d-goog
> >
>
>
> --
> Thanks,
> ~Nick Desaulniers


--=20
Ricardo Ribalda