linux-kernel - Re: [PATCH v6 4/4] risc/purgatory: Add linker script

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Message-ID: <CAKwvOd=9RMivtkKX27nDDsagH5yCWjpAOvpE2uaW38KYC57vtg@mail.gmail.com>
Date:   Mon, 1 May 2023 09:19:10 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Eric Biederman <ebiederm@...ssion.com>,
        Philipp Rudo <prudo@...ux.vnet.ibm.com>,
        Dave Young <dyoung@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Tom Rix <trix@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, Baoquan He <bhe@...hat.com>,
        Philipp Rudo <prudo@...hat.com>, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Ross Zwisler <zwisler@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Simon Horman <horms@...nel.org>, llvm@...ts.linux.dev,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v6 4/4] risc/purgatory: Add linker script

On Mon, May 1, 2023 at 5:39 AM Ricardo Ribalda <ribalda@...omium.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@...r.kernel.org
> Fixes: 930457057abe ("kernel/kexec_file.c: split up __kexec_load_puragory")
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.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/Makefile
> index 5730797a6b40..cf3a44121a90 100644
> --- a/arch/riscv/purgatory/Makefile
> +++ b/arch/riscv/purgatory/Makefile
> @@ -35,6 +35,11 @@ CFLAGS_sha256.o := -D__DISABLE_EXPORTS
>  CFLAGS_string.o := -D__DISABLE_EXPORTS
>  CFLAGS_ctype.o := -D__DISABLE_EXPORTS
>
> +# When profile optimization is enabled, llvm emits two different overlapping
> +# text sections, which is not supported by kexec. Remove profile optimization
> +# flags.
> +KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(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 := -e purgatory_start -z nodefaultlib
>
> --
> 2.40.1.495.gc816e09b53d-goog
>


-- 
Thanks,
~Nick Desaulniers