linux-kernel - Re: [PATCH v3 3/7] x86/boot: Move the early GDT/IDT setup code into startup/

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Message-ID: <Z_ZGbVXOTPbGXleS@gmail.com>
Date: Wed, 9 Apr 2025 12:05:33 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Ard Biesheuvel <ardb+git@...gle.com>
Cc: linux-efi@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org,
	Ard Biesheuvel <ardb@...nel.org>,
	Tom Lendacky <thomas.lendacky@....com>,
	Dionna Amalie Glaze <dionnaglaze@...gle.com>,
	Kevin Loughlin <kevinloughlin@...gle.com>
Subject: Re: [PATCH v3 3/7] x86/boot: Move the early GDT/IDT setup code into
 startup/


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

> From: Ard Biesheuvel <ardb@...nel.org>
> 
> Move the early GDT/IDT setup code that runs long before the kernel
> virtual mapping is up into arch/x86/boot/startup/, and build it in a way
> that ensures that the code tolerates being called from the 1:1 mapping
> of memory. The code itself is left unchanged by this patch.
> 
> Also tweak the sed symbol matching pattern in the decompressor to match
> on lower case 't' or 'b', as these will be emitted by Clang for symbols
> with hidden linkage.
> 
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> ---
>  arch/x86/boot/compressed/Makefile |  2 +-
>  arch/x86/boot/startup/Makefile    | 15 ++++
>  arch/x86/boot/startup/gdt_idt.c   | 83 ++++++++++++++++++++
>  arch/x86/kernel/head64.c          | 73 -----------------
>  4 files changed, 99 insertions(+), 74 deletions(-)

This causes the following build failure on x86-64-defconfig:

   arch/x86/boot/startup/gdt_idt.c:67:55: error: cast to generic address space pointer from disjoint ‘__seg_gs’ address space pointer [-Werror]

Thanks,

	Ingo