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

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Message-ID: <CAMj1kXGk0udgM67wrWqahqK8H0uE8emQj51SmJey+7fE-FTjdA@mail.gmail.com>
Date: Thu, 23 Oct 2025 10:06:57 +0200
From: Ard Biesheuvel <ardb@...nel.org>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Tiezhu Yang <yangtiezhu@...ngson.cn>, Josh Poimboeuf <jpoimboe@...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 Thu, 23 Oct 2025 at 10:01, Huacai Chen <chenhuacai@...nel.org> wrote:
>
> On Thu, Oct 23, 2025 at 2:55 PM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
> >
> > Hi Josh and Ard,
> >
> > On 2025/10/20 下午2:55, Huacai Chen wrote:
> > > On Mon, Oct 20, 2025 at 9:24 AM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
> > >>
> > >> Hi Josh, Ard and Huacai,
> > >>
> > >> On 2025/10/18 上午1:05, Josh Poimboeuf wrote:
> > >>
> > >> ...
> > >>
> > >>> But IIUC, the libstub code runs *very* early, and wouldn't show up in a
> > >>> stack trace anyway, because there are no traces of it on the stack once
> > >>> it branches to head.S code (which doesn't save the link register).
> > >>
> > >> Thanks for your discussions.
> > >>
> > >> Are you OK with this current patch?
> > > For me the current patch is just OK.
> >
> > We have discussed this a few times but there is almost no consensus
> > of what should happen next and nothing changes.
> >
> > Could you please give me a clear reply? Then I can make progress for
> > the following series:
> >
> > https://lore.kernel.org/loongarch/20250917112716.24415-1-yangtiezhu@loongson.cn/
> For me, this patch is OK, ignore __efistub_ prefix in objtool is also
> OK [1]. But I cannot accept the way that modifying the efistub part
> only for LoongArch.
>
> Clear enough?
>

LoongArch is the only architecture which has the problem, so I don't
see a reason to modify other architectures.