linux-kernel - Re: [PATCH v1 2/3] objtool/LoongArch: Fix unreachable instruction warnings about EFISTUB

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Message-ID: <CAAhV-H5qhKepa-8sz3_AC=_RCChbVeEmnHKESMqpiJ0phMORbg@mail.gmail.com>
Date: Thu, 4 Sep 2025 10:21:19 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Nathan Chancellor <nathan@...nel.org>, loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/3] objtool/LoongArch: Fix unreachable instruction
 warnings about EFISTUB

On Thu, Sep 4, 2025 at 10:18 AM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
>
> On 2025/9/4 上午3:19, Josh Poimboeuf wrote:
> > On Mon, Sep 01, 2025 at 04:39:29PM +0800, Tiezhu Yang wrote:
> >> On 2025/9/1 下午4:19, Peter Zijlstra wrote:
> >>> On Mon, Sep 01, 2025 at 03:21:55PM +0800, Tiezhu Yang wrote:
> >>>> When compiling with LLVM and CONFIG_LTO_CLANG is set, there exist the
> >>>> following objtool warnings:
>
> ...
>
> >> Josh suggested to do something to put these instructions in the data
> >> section, but as said in the previous reply, it needs to modify the link
> >> process and seems too complicated and expensive for this warning to some
> >> extent.
> >>
> >> So I did this change for objtool.
> >
> > I don't like this workaround either, how exactly is it complicated and
> > expensive to put the data in a data section?
>
> I can put them in a data section in the next version, this is
> reasonable.
No, from the ARM64 and RISC-V design, we can put jump instructions in
the HEAD section, and this is what Jiaxun wants to do. Changing to a
data section is not reasonable.

Huacai

>
> Thanks,
> Tiezhu
>