linux-kernel - Re: [PATCH V2] x86/boot: explicitly place .eh

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Message-ID: <CAKwvOdnJR3vbHd6Z0eLK9CppABWFL4E0Rjh6SzDN6U6mShS2qQ@mail.gmail.com>
Date:   Wed, 6 Nov 2019 09:23:50 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Ilie Halip <ilie.halip@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH V2] x86/boot: explicitly place .eh_frame after .rodata

On Wed, Nov 6, 2019 at 4:06 AM Ilie Halip <ilie.halip@...il.com> wrote:
>
> When using GCC as compiler and LLVM's lld as linker, linking
> setup.elf fails:
>       LD      arch/x86/boot/setup.elf
>     ld.lld: error: init sections too big!
>
> This happens because ld.lld has different rules for placing
> orphan sections (i.e. sections not mentioned in a linker script)
> compared to ld.bfd.
>
> Particularly, in this case, the merged .eh_frame section is
> placed before __end_init, which triggers an assert in the script.
>
> Explicitly place this section after .rodata, in accordance with
> ld.bfd's behavior.
>
> Signed-off-by: Ilie Halip <ilie.halip@...il.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/760

Thanks for following up with a v2.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>
> Changes in V2:
>  * removed wildcard for input sections (.eh_frame* -> .eh_frame)
>
>  arch/x86/boot/setup.ld | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/x86/boot/setup.ld b/arch/x86/boot/setup.ld
> index 0149e41d42c2..30ce52635cd0 100644
> --- a/arch/x86/boot/setup.ld
> +++ b/arch/x86/boot/setup.ld
> @@ -25,6 +25,7 @@ SECTIONS
>
>         . = ALIGN(16);
>         .rodata         : { *(.rodata*) }
> +       .eh_frame       : { *(.eh_frame) }
>
>         .videocards     : {
>                 video_cards = .;
> --
> 2.17.1
>


-- 
Thanks,
~Nick Desaulniers