linux-kernel - Re: [PATCH v2] efistub: Only link libstub to final vmlinux

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Message-ID: <CAAhV-H47fzaKcMhgLWWOTxB+srBsg85-eK0LW1vQXQnvq32-+w@mail.gmail.com>
Date: Sat, 15 Nov 2025 11:16:42 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Josh Poimboeuf <jpoimboe@...nel.org>, Catalin Marinas <catalin.marinas@....com>, 
	Will Deacon <will@...nel.org>, Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, 
	"Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>
Cc: Tiezhu Yang <yangtiezhu@...ngson.cn>, Ard Biesheuvel <ardb@...nel.org>, loongarch@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-riscv@...ts.infradead.org, 
	linux-efi@...r.kernel.org, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] efistub: Only link libstub to final vmlinux

On Wed, Nov 12, 2025 at 2:00 AM Josh Poimboeuf <jpoimboe@...nel.org> wrote:
>
> On Mon, Nov 10, 2025 at 03:00:00PM +0800, Huacai Chen wrote:
> > On Mon, Nov 10, 2025 at 9:19 AM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
> > > If I understand correctly, I should modify this patch to remove the
> > > changes of arm and riscv for now, do the changes only when there is
> > > a real problem or requirement some day, right? If no more comments,
> > > I will send v3 later.
> >
> > Now everyone involved agrees that the efistub code is correct, so the
> > proper solution is to fix the compiler.
>
> Hm?  I don't see how it's a compiler bug.  It's really just an objtool
> limitation.
>
> > Changing efistub code and changing objtool (ignore __efistub prefix)
> > are both workarounds, but I think changing objtool is a little more
> > reasonable. Maybe Josh has different ideas?
>
> I thought the conversation had converged on what Tiezhu mentioned above,
> which is to skip objtool on libstub for loongarch, but leave the other
> arches alone.  That way objtool behavior is consistent between loongarch
> and x86, and objtool doesn't need to ignore any prefixes.
>
> So basically, the v2 patch minus the arm64/riscv changes.

Hi, ARM64 and RISC-V maintainers,

Would you mind that this patch modifies the three architectures
together (they are exactly the same style now)?

Madhavan is the author of ARM64's objtool, I think your opinion is
also very important.


Huacai

>
> --
> Josh