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

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Message-ID: <e36f8b19-c801-c872-381e-7eb40dc5e3e4@kernel.org>
Date: Thu, 20 Nov 2025 19:09:18 -0700 (MST)
From: Paul Walmsley <pjw@...nel.org>
To: Huacai Chen <chenhuacai@...nel.org>
cc: Will Deacon <will@...nel.org>, Josh Poimboeuf <jpoimboe@...nel.org>, 
    Catalin Marinas <catalin.marinas@....com>, Paul Walmsley <pjw@...nel.org>, 
    Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
    "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>, 
    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 Mon, 17 Nov 2025, Will Deacon wrote:

> On Sat, Nov 15, 2025 at 11:16:42AM +0800, Huacai Chen wrote:
> > 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:
> > >
> > > > 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.
> 
> arm64 doesn't (yet) use objtool.
> 
> I defer to Ard on anything relating to the arm64 efistub. Reading the
> start of this thread, it doesn't look like he's convinced and I'm not
> surprised if it's purely an issue with objtool.

Same for RISC-V.


- Paul