linux-kernel - Re: [PATCH v2 08/15] x86/boot: Drop references to startup

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Date:   Fri, 15 Sep 2023 11:15:43 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Ard Biesheuvel <ardb@...gle.com>
Cc:     linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ard Biesheuvel <ardb@...nel.org>,
        Evgeniy Baskov <baskov@...ras.ru>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Jones <pjones@...hat.com>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v2 08/15] x86/boot: Drop references to startup_64


* Ard Biesheuvel <ardb@...gle.com> wrote:

> From: Ard Biesheuvel <ardb@...nel.org>
> 
> The x86 boot image generation tool assign a default value to startup_64
> and subsequently parses the actual value from zoffset.h but it never
> actually uses the value anywhere. So remove this code.
> 
> This change has no impact on the resulting bzImage binary.
> 
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> ---
>  arch/x86/boot/Makefile      | 2 +-
>  arch/x86/boot/tools/build.c | 3 ---
>  2 files changed, 1 insertion(+), 4 deletions(-)

Note that this patch conflicted with a recent upstream cleanup commit:

   e78d334a5470 ("x86/boot: Mark global variables as static")

It was trivial to resolve, but please double-check the result once I push 
out the new tip:x86/boot tree.

Thanks,

	Ingo